The Target Absorbers for Neutrals (TANs) represent one of the most radioactive regions in the Large Hadron Collider (LHC). Seven 40 cm long fused silica rods with different dopant specifications, manufactured by Heraeus, were irradiated in one of the TANs located around the ATLAS experiment by the Beam RAte of Neutrals (BRAN) detector group. This campaign took place during the Run 2 p+p data taking, which occurred between 2016 and 2018. This paper reports a complete characterization of optical transmission per unit length of irradiated fused silica materials as a function of wavelength (240 nm - 1500 nm), dose (up to 18 MGy), and level of OH and H$_2$ dopants introduced in the manufacturing process. The dose delivered to the rods was estimated using Monte Carlo simulations performed by the CERN FLUKA team.

The Target Absorbers for Neutrals (TANs) are located in a high intensity radiation environment inside the tunnel of the Large Hadron Collider (LHC). TANs are positioned about 140 m downstream from the beam interaction points. Seven 40-cm long fused silica rods with different dopant specifications were irradiated in the TAN by the Beam RAte of Neutrals (BRAN) detector group during p + p data taking from 2016 to 2018 at the LHC. The peak dose delivered to the fused silica rods was 18 MGy. We report measurements of the 22Na activation of the fused silica rods carried out at the University of Illinois at Urbana-Champaign and Argonne National Laboratory. At the end of the irradiation campaign, the maximum 22Na activity observed was A = 21 kBq/cm3 corresponding to a density, rho = 2.5 x 1012/cm3, of 22Na nuclei. FLUKA Monte Carlo simulations have been performed by the CERN FLUKA team to estimate 22Na activities for the irradiated BRAN rod samples. The simulations reproduce the 22Na activity profile measured along the rods, with a 35% underestimation of the experimental measurement results.

The two Zero Degree Calorimeters (ZDCs) of the CMS experiment are located at ± 140 m from the collision point and detect neutral particles in the |η| > 8.3 pseudorapidity region. This paper presents a study on the performance of the ZDC in the 2016 pPb run. The response of the detectors to ultrarelativistic neutrons is studied using in-depth Monte Carlo simulations. A method of signal extraction based on template fits is presented, along with a dedicated calibration procedure. A deconvolution technique for the correction of overlapping collision events is discussed.

A search is conducted for a low-mass charged Higgs boson produced in a top quark decay and subsequently decaying into a charm and a strange quark. The data sample was recorded in proton-proton collisions at $\\sqrt{s}=$ 13 TeV by the CMS experiment at the LHC and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The search is performed in the process of top quark pair production, where one top quark decays to a bottom quark and a charged Higgs boson, and the other to a bottom quark and a W boson. With the W boson decaying to a charged lepton (electron or muon) and a neutrino, the final state comprises an isolated lepton, missing transverse momentum, and at least four jets, of which two are tagged as b jets. To enhance the search sensitivity, one of the jets originating from the charged Higgs boson is required to satisfy a charm tagging selection. No significant excess beyond standard model predictions is found in the dijet invariant mass distribution. An upper limit in the range 1.68-0.25% is set on the branching fraction of the top quark decay to the charged Higgs boson and bottom quark for a charged Higgs boson mass between 80 and 160 GeV.

The sPHENIX experiment at RHIC will collect high statistics proton-proton, proton-nucleus and nucleus-nucleus data, starting in the early 2020's. The sPHENIX capabilities enable state-of-the-art studies of jet modification, upsilon suppression and open heavy flavor production to probe the microscopic nature of the strongly-coupled Quark Gluon Plasma, and will allow a broad range of cold QCD studies. The sPHENIX detector will provide precision vertexing, tracking and electromagnetic and hadronic calorimetry in the central pseudorapidity region |η| < 1.1, with full azimuth coverage, at the full RHIC collision rate, delivering unprecedented data sets for hard probe tomography measurements at RHIC. In this talk, we will present a brief overview of the sPHENIX detector design with emphasis on calorimetry. The novel design of the sPHENIX calorimeters includes a tungsten/scintillating fiber electromagnetic calorimeter and two steel/scintillating tile hadronic calorimeter sections. The calorimeter has been optimized for upsilon and jet measurements in the high multiplicity environment of heavy-ion collisions. The design has been simulated in detail using GEANT4, and the simulations have extensively vetted against results obtained from the T-1044 test beam facility at FNAL. Both simulation data and test beam data, and the resulting jet physics performance, will be presented in this talk.

Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of $J/\psi$ measurements at forward and backward rapidity in various small collision systems, $p$$+$$p$, $p$$+$Al, $p$$+$Au and $^3$He$+$Au, at $\sqrt{s_{_{NN}}}$=200 GeV. The results are presented in the form of the observable $R_{AB}$, the nuclear modification factor, a measure of the ratio of the $J/\psi$ invariant yield compared to the scaled yield in $p$$+$$p$ collisions. We examine the rapidity, transverse momentum, and collision centrality dependence of nuclear effects on $J/\psi$ production with different projectile sizes $p$ and $^3$He, and different target sizes Al and Au. The modification is found to be strongly dependent on the target size, but to be very similar for $p$$+$Au and $^{3}$He$+$Au. However, for 0%--20% central collisions at backward rapidity, the modification for $^{3}$He$+$Au is found to be smaller than that for $p$$+$Au, with a mean fit to the ratio of $0.89\pm0.03$(stat)${\pm}0.08$(syst), possibly indicating final state effects due to the larger projectile size.

We study the light output, light collection efficiency and signal timing of a variety of organic scintillators that are being considered for the upgrade of the hadronic calorimeter of the CMS detector. The experimental data are collected at the H2 test-beam area at CERN, using a 150 GeV muon beam. In particular, we investigate the usage of over-doped and green-emitting plastic scintillators, two solutions that have not been extensively considered. We present a study of the energy distribution in plastic-scintillator tiles, the hit efficiency as a function of the hit position, and a study of the signal timing for blue and green scintillators.

The production of J/ψ mesons is studied in proton-lead collisions at the centre-of-mass energy per nucleon pair sNN=8.16TeV with the LHCb detector at the LHC. The double differential cross-sections of prompt and nonprompt J/ψ production are measured as a function of the J/ψ transverse momentum and rapidity in the nucleon–nucleon centre-of-mass frame. Forward-to-backward ratios and nuclear modification factors are determined. The results are compared with theoretical calculations based on collinear factorisation using nuclear parton distribution functions, on the colour glass condensate or on coherent energy loss models.

We present midrapidity charged-pion invariant cross sections, the ratio of the pi(-) to pi(+) cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at root s = p + 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the chargedpion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of similar to 0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution. Disciplines Elementary Particles and Fields and String Theory | Physics Comments This is an article from Physical Review D 91 (2015): 032001, doi:10.1103/PhysRevD.91.032001. Posted with permission. Authors Andrew Adare, Alan Dion, John C. Hill, Todd Kempel, John G. Lajoie, Alexandre Lebedev, Craig Ogilvie, H. Pei, Marzia Rosati, C. L. Silva, Feng Wei, et al., and PHENIX Collaboration This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/physastro_pubs/232 Charged-pion cross sections and double-helicity asymmetries in polarized pþ p collisions at ffiffi s p 1⁄4 200 GeV A. Adare, C. Aidala, N. N. Ajitanand, Y. Akiba, R. Akimoto, H. Al-Ta’ani, J. Alexander, K. R. Andrews, A. Angerami, K. Aoki, N. Apadula, E. Appelt, Y. Aramaki, R. Armendariz, E. C. Aschenauer, E. T. Atomssa, T. C. Awes, B. Azmoun, V. Babintsev, M. Bai, B. Bannier, K. N. Barish, B. Bassalleck, A. T. Basye, S. Bathe, V. Baublis, C. Baumann, A. Bazilevsky, R. Belmont, J. Ben-Benjamin, R. Bennett, D. S. Blau, J. S. Bok, K. Boyle, M. L. Brooks, D. Broxmeyer, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, S. Campbell, P. Castera, C.-H. Chen, C. Y. Chi, M. Chiu, I. J. Choi, J. B. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, Z. Conesa del Valle, M. Connors, M. Csanád, T. Csörgő, S. Dairaku, A. Datta, G. David, M. K. Dayananda, A. Denisov, A. Deshpande, E. J. Desmond, K. V. Dharmawardane, O. Dietzsch, A. Dion, M. Donadelli, O. Drapier, A. Drees, K. A. Drees, J. M. Durham, A. Durum, L. D’Orazio, Y. V. Efremenko, T. Engelmore, A. Enokizono, H. En’yo, S. Esumi, B. Fadem, D. E. Fields, M. Finger, M. Finger, Jr., F. Fleuret, S. L. Fokin, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukao, T. Fusayasu, C. Gal, I. Garishvili, F. Giordano, A. Glenn, X. Gong, M. Gonin, Y. Goto, R. Granier de Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, L. Guo, H.-Å. Gustafsson, J. S. Haggerty, K. I. Hahn, H. Hamagaki, J. Hamblen, R. Han, J. Hanks, C. Harper, K. Hashimoto, E. Haslum, R. Hayano, X. He, T. K. Hemmick, T. Hester, J. C. Hill, R. S. Hollis, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, Y. Hori, D. Hornback, S. Huang, T. Ichihara, R. Ichimiya, H. Iinuma, Y. Ikeda, K. Imai, M. Inaba, A. Iordanova, D. Isenhower, M. Ishihara, M. Issah, D. Ivanischev, Y. Iwanaga, B. V. Jacak, J. Jia, X. Jiang, D. John, B. M. Johnson, T. Jones, K. S. Joo, D. Jouan, J. Kamin, S. Kaneti, B. H. Kang, J. H. Kang, J. S. Kang, J. Kapustinsky, K. Karatsu, M. Kasai, D. Kawall, A. V. Kazantsev, T. Kempel, A. Khanzadeev, K. M. Kijima, B. I. Kim, D. J. Kim, E.-J. Kim, Y.-J. Kim, Y. K. Kim, E. Kinney, Á. Kiss, E. Kistenev, D. Kleinjan, P. Kline, L. Kochenda, B. Komkov, M. Konno, J. Koster, D. Kotov, A. Král, G. J. Kunde, K. Kurita, M. Kurosawa, Y. Kwon, G. S. Kyle, R. Lacey, Y. S. Lai, J. G. Lajoie, A. Lebedev, D. M. Lee, J. Lee, K. B. Lee, K. S. Lee, S. H. Lee, S. R. Lee, M. J. Leitch, M. A. L. Leite, X. Li, S. H. Lim, L. A. Linden Levy, H. Liu, M. X. Liu, B. Love, D. Lynch, C. F. Maguire, Y. I. Makdisi, A. Manion, V. I. Manko, E. Mannel, Y. Mao, H. Masui, M. McCumber, P. L. McGaughey, D. McGlinchey, C. McKinney, N. Means, M. Mendoza, B. Meredith, Y. Miake, T. Mibe, A. C. Mignerey, K. Miki, A. Milov, J. T. Mitchell, Y. Miyachi, A. K. Mohanty, H. J. Moon, Y. Morino, A. Morreale, D. P. Morrison, S. Motschwiller, T. V. Moukhanova, T. Murakami, J. Murata, S. Nagamiya, J. L. Nagle, M. Naglis, M. I. Nagy, I. Nakagawa, Y. Nakamiya, K. R. Nakamura, T. Nakamura, K. Nakano, J. Newby, M. Nguyen, M. Nihashi, R. Nouicer, A. S. Nyanin, C. Oakley, E. O’Brien, C. A. Ogilvie, M. Oka, K. Okada, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, V. Pantuev, V. Papavassiliou, B. H. Park, I. H. Park, S. K. Park, S. F. Pate, L. Patel, H. Pei, J.-C. Peng, H. Pereira, D. Yu. Peressounko, R. Petti, C. Pinkenburg, R. P. Pisani, M. Proissl, M. L. Purschke, H. Qu, J. Rak, I. Ravinovich, K. F. Read, K. Reygers, V. Riabov, Y. Riabov, E. Richardson, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, S. S. E. Rosendahl, J. G. Rubin, B. Sahlmueller, N. Saito, T. Sakaguchi, V. Samsonov, S. Sano, M. Sarsour, T. Sato, M. Savastio, S. Sawada, K. Sedgwick, R. Seidl, R. Seto, D. Sharma, I. Shein, T.-A. Shibata, K. Shigaki, H. H. Shim, M. Shimomura, K. Shoji, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, C. Silvestre, K. S. Sim, B. K. Singh, C. P. Singh, V. Singh, M. Slunečka, T. Sodre, R. A. Soltz, W. E. Sondheim, S. P. Sorensen, I. V. Sourikova, P. W. Stankus, E. Stenlund, S. P. Stoll, T. Sugitate, A. Sukhanov, J. Sun, J. Sziklai, E. M. Takagui, A. Takahara, A. Taketani, R. Tanabe, Y. Tanaka, S. Taneja, K. Tanida, M. J. Tannenbaum, S. Tarafdar, A. Taranenko, E. Tennant, H. Themann, D. Thomas, M. Togawa, L. Tomášek, M. Tomášek, H. Torii, R. S. Towell, I. Tserruya, Y. Tsuchimoto, K. Utsunomiya, C. Vale, H.W. van Hecke, E. Vazquez-Zambrano, A. Veicht, J. Velkovska, R. Vértesi, M. Virius, A. Vossen, V. Vrba, E. Vznuzdaev, X. R. Wang, D. Watanabe, K. Watanabe, Y. Watanabe, Y. S. Watanabe, F. Wei, R. Wei, J. Wessels, S. N. White, D. Winter, C. L. Woody, R. M. Wright, M. Wysocki, Y. L. Yamaguchi, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, J. S. Yoo, Z. You, G. R. Young, I. Younus, I. E. Yushmanov, W. A. Zajc, A. Zelenski, and S. Zhou (PHENIX Collaboration) Abilene Christian University, Abilene, Texas 79699, USA Department of Physics, Augustana College, Sioux Falls, South Dakota 57197, USA Department of Physics, Banaras Hindu University, Varanasi 221005, India PHYSICAL REVIEW D 91, 032001 (2015) 1550-7998=2015=91(3)=032001(13) 032001-1 © 2015 American Physical Society Bhabha Atomic Research Centre, Bombay 400 085, India Baruch College, City University of New York, New York, New York 10010, USA Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA University of California Riverside, Riverside, California 92521, USA Charles University, Ovocný trh 5, Praha 1, 116 36 Prague, Czech Republic Chonbuk National University, Jeonju 561-756, Korea Science and Technology on Nuclear Data Laboratory, China Institute of Atomic Energy, Beijing 102413, People’s Republic of China Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan University of Colorado, Boulder, Colorado 80309, USA Columbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USA Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic Dapnia, CEA Saclay, F-91191 Gif-sur-Yvette, France ELTE, Eötvös Loránd University, Pázmany Péter sétány 1/A, H-1117 Budapest, Hungary Ewha Womans University, Seoul 120-750, Korea Florida State University, Tallahassee, Florida 32306, USA Georgia State University, Atlanta, Georgia 30303, USA Hanyang University, Seoul 133-792, Korea Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA Institute for Nuclear Research of the Russian Academy of Sciences, prospekt 60-letiya Oktyabrya 7a, Moscow 117312, Russia Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic Iowa State University, Ames, Iowa 50011, USA Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan Helsinki Institute of Physics and University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan Korea University, Seoul 136-701, Korea Russian Research Center “Kurchatov Institute”, Moscow 123098, Russia Kyoto University, Kyoto 606-8502, Japan Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, France Physics Department, Lahore University of Management Sciences, Lahore 54792, Pakistan Lawrence Livermore National Laboratory, Livermore, California 94550, USA Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden University of Maryland, College Park, Maryland 20742, USA Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA Institut fur Kernphysik, University of Muenster, D-48149 Muenster, Germany Muhlenberg College, Allentown, Pennsylvania 18104-5586, USA Myongji University, Yongin, Kyonggido 449-728, Korea Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan National Research Nuclear University, MEPhI, Moscow Engineering Physics Institute, Moscow 115409, Russia University of New Mexico, Albuquerque, New Mexico 87131, USA New Mexico State University,

The Phase I upgrade of the CMS Hadron Endcap Calorimeters consists of new photodetectors (Silicon Photomultipliers in place of Hybrid Photo-Diodes) and front-end electronics. The upgrade will eliminate the noise and the calibration drift of the Hybrid Photo-Diodes and enable the mitigation of the radiation damage of the scintillators and the wavelength shifting fibers with a larger spectral acceptance of the Silicon Photomultipliers. The upgrade also includes increased longitudinal segmentation of the calorimeter readout, which allows pile-up mitigation and recalibration due to depth-dependent radiation damage. As a realistic operational test, the responses of the Hadron Endcap Calorimeter wedges were calibrated with a 60Co radioactive source with upgrade electronics. The test successfully established the procedure for future source calibrations of the Hadron Endcap Calorimeters. Here we describe the instrumentation details and the operational experiences related to the sourcing test.

We report the first measurement of the fraction of J/ψ mesons coming from B-meson decay (FB→J/ψ) in p+p collisions at s=510  GeV. The measurement is performed using the forward silicon vertex detector and central vertex detector at PHENIX, which provide precise tracking and distance-of-closest-approach determinations, enabling the statistical separation of J/ψ due to B-meson decays from prompt J/ψ. The measured value of FB→J/ψ is 8.1%±2.3%(stat)±1.9%(syst) for J/ψ with transverse momenta 0<pT<5  GeV/c and rapidity 1.2<|y|<2.2. The measured fraction FB→J/ψ at PHENIX is compared to values measured by other experiments at higher center of mass energies and to fixed-order-next-to-leading-logarithm and color-evaporation-model predictions. The bb¯ cross section per unit rapidity [dσ/dy(pp→bb¯)] extracted from the obtained FB→J/ψ and the PHENIX inclusive J/ψ cross section measured at 200 GeV scaled with color-evaporation-model calculations, at the mean B hadron rapidity y=±1.7 in 510 GeV p+p collisions, is 3.63-1.70+1.92  μb. It is consistent with the fixed-order-next-to-leading-logarithm calculations.

A. Adare,14 S. Afanasiev,32 C. Aidala,41,45,46 N. N. Ajitanand,65 Y. Akiba,59,60 R. Akimoto,13 H. Al-Bataineh,53 H. Al-Ta’ani,53 J. Alexander,65 A. Angerami,15 K. Aoki,37,59 N. Apadula,66 L. Aphecetche,67 Y. Aramaki,13,59 J. Asai,59 H. Asano,37,59 E. C. Aschenauer,8 E. T. Atomssa,38,66 R. Averbeck,66 T. C. Awes,55 B. Azmoun,8 V. Babintsev,26 M. Bai,7 G. Baksay,21 L. Baksay,21 A. Baldisseri,17 B. Bannier,66 K. N. Barish,9 P. D. Barnes,41,* B. Bassalleck,52 A. T. Basye,1 S. Bathe,6,9,60 S. Batsouli,55 V. Baublis,58 C. Baumann,47 S. Baumgart,59 A. Bazilevsky,8 S. Belikov,8,* R. Belmont,71 R. Bennett,66 A. Berdnikov,62 Y. Berdnikov,62 A. A. Bickley,14 X. Bing,54 D. S. Blau,36 J. G. Boissevain,41 J. S. Bok,53 H. Borel,17 K. Boyle,60,66 M. L. Brooks,41 H. Buesching,8 V. Bumazhnov,26 G. Bunce,8,60 S. Butsyk,41,52 C. M. Camacho,41 S. Campbell,66 P. Castera,66 B. S. Chang,75 W. C. Chang,2 J.-L. Charvet,17 C.-H. Chen,66 S. Chernichenko,26 C. Y. Chi,15 M. Chiu,8,27 I. J. Choi,27,75 J. B. Choi,11 S. Choi,64 R. K. Choudhury,5 P. Christiansen,43 T. Chujo,70 P. Chung,65 A. Churyn,26 O. Chvala,9 V. Cianciolo,55 Z. Citron,66 B. A. Cole,15 M. Connors,66 P. Constantin,41 M. Csanád,19 T. Csörgő,74 T. Dahms,66 S. Dairaku,37,59 K. Das,22 A. Datta,45 M. S. Daugherity,1 G. David,8 A. Denisov,26 D. d’Enterria,38 A. Deshpande,60,66 E. J. Desmond,8 K. V. Dharmawardane,53 O. Dietzsch,63 L. Ding,30 A. Dion,30,66 M. Donadelli,63 O. Drapier,38 A. Drees,66 K. A. Drees,7 A. K. Dubey,73 J. M. Durham,41,66 A. Durum,26 D. Dutta,5 V. Dzhordzhadze,9 L. D’Orazio,44 S. Edwards,7 Y. V. Efremenko,55 F. Ellinghaus,14 T. Engelmore,15 A. Enokizono,40,55 H. En’yo,59,60 S. Esumi,70 K. O. Eyser,9 B. Fadem,48 D. E. Fields,52,60 M. Finger,10 M. Finger Jr.,10 F. Fleuret,38 S. L. Fokin,36 Z. Fraenkel,73,* J. E. Frantz,54,66 A. Franz,8 A. D. Frawley,22 K. Fujiwara,59 Y. Fukao,37,59 T. Fusayasu,50 K. Gainey,1 C. Gal,66 A. Garishvili,68 I. Garishvili,40,68 A. Glenn,14,40 H. Gong,66 X. Gong,65 M. Gonin,38 J. Gosset,17 Y. Goto,59,60 R. Granier de Cassagnac,38 N. Grau,3,15 S. V. Greene,71 M. Grosse Perdekamp,27,60 T. Gunji,13 L. Guo,41 H.-Å. Gustafsson,43,* T. Hachiya,59 A. Hadj Henni,67 J. S. Haggerty,8 K. I. Hahn,20 H. Hamagaki,13 R. Han,57 J. Hanks,15 E. P. Hartouni,40 K. Haruna,25 K. Hashimoto,59,61 E. Haslum,43 R. Hayano,13 X. He,23 M. Heffner,40 T. K. Hemmick,66 T. Hester,9 J. C. Hill,30 M. Hohlmann,21 R. S. Hollis,9 W. Holzmann,65 K. Homma,25 B. Hong,35 T. Horaguchi,13,59,69,70 Y. Hori,13 D. Hornback,68 S. Huang,71 T. Ichihara,59,60 R. Ichimiya,59 H. Iinuma,34,37,59 Y. Ikeda,59,70 K. Imai,31,37,59 J. Imrek,18 M. Inaba,70 A. Iordanova,9 D. Isenhower,1 M. Ishihara,59 T. Isobe,13,59 M. Issah,65,71 A. Isupov,32 D. Ivanischev,58 D. Ivanishchev,58 B. V. Jacak,66 M. Javani,23 J. Jia,8,15,65 X. Jiang,41 J. Jin,15 B. M. Johnson,8 K. S. Joo,49 D. Jouan,56 D. S. Jumper,27 F. Kajihara,13 S. Kametani,59 N. Kamihara,60 J. Kamin,66 S. Kaneti,66 B. H. Kang,24 J. H. Kang,75 J. S. Kang,24 J. Kapustinsky,41 K. Karatsu,37,59 M. Kasai,59,61 D. Kawall,45,60 A. V. Kazantsev,36 T. Kempel,30 A. Khanzadeev,58 K. M. Kijima,25 J. Kikuchi,72 B. I. Kim,35 C. Kim,35 D. H. Kim,49 D. J. Kim,33,75 E. Kim,64 E.-J. Kim,11 H. J. Kim,75 K.-B. Kim,11 S. H. Kim,75 Y.-J. Kim,27 Y. K. Kim,24 E. Kinney,14 K. Kiriluk,14 Á. Kiss,19 E. Kistenev,8 J. Klatsky,22 J. Klay,40 C. Klein-Boesing,47 D. Kleinjan,9 P. Kline,66 L. Kochenda,58 Y. Komatsu,13 B. Komkov,58 M. Konno,70 J. Koster,27 D. Kotchetkov,54 D. Kotov,58,62 A. Kozlov,73 A. Král,16 A. Kravitz,15 F. Krizek,33 G. J. Kunde,41 K. Kurita,59,61 M. Kurosawa,59 M. J. Kweon,35 Y. Kwon,68,75 G. S. Kyle,53 R. Lacey,65 Y. S. Lai,15 J. G. Lajoie,30 D. Layton,27 A. Lebedev,30 B. Lee,24 D. M. Lee,41 J. Lee,20 K. B. Lee,35 K. S. Lee,35 S. H. Lee,66 S. R. Lee,11 T. Lee,64 M. J. Leitch,41 M. A. L. Leite,63 M. Leitgab,27 B. Lenzi,63 B. Lewis,66 X. Li,12 P. Liebing,60 S. H. Lim,75 L. A. Linden Levy,14 T. Liška,16 A. Litvinenko,32 H. Liu,53 M. X. Liu,41 B. Love,71 D. Lynch,8 C. F. Maguire,71 Y. I. Makdisi,7 M. Makek,73,76 A. Malakhov,32 M. D. Malik,52 A. Manion,66 V. I. Manko,36 E. Mannel,15 Y. Mao,57,59 L. Mašek,10,29 H. Masui,70 S. Masumoto,13 F. Matathias,15 M. McCumber,14,66 P. L. McGaughey,41 D. McGlinchey,14,22 C. McKinney,27 N. Means,66 M. Mendoza,9 B. Meredith,27 Y. Miake,70 T. Mibe,34 A. C. Mignerey,44 P. Mikeš,29 K. Miki,70 A. Milov,8,73 D. K. Mishra,5 M. Mishra,4 J. T. Mitchell,8 Y. Miyachi,59,69 S. Miyasaka,59,69 A. K. Mohanty,5 H. J. Moon,49 Y. Morino,13 A. Morreale,9 D. P. Morrison,8,† S. Motschwiller,48 T. V. Moukhanova,36 D. Mukhopadhyay,71 T. Murakami,37,59 J. Murata,59,61 T. Nagae,37 S. Nagamiya,34,59 J. L. Nagle,14,‡ M. Naglis,73 M. I. Nagy,19,74 I. Nakagawa,59,60 Y. Nakamiya,25 K. R. Nakamura,37,59 T. Nakamura,25,59 K. Nakano,59,69 C. Nattrass,68 A. Nederlof,48 J. Newby,40 M. Nguyen,66 M. Nihashi,25,59 T. Niida,70 R. Nouicer,8,60 N. Novitzky,33 A. S. Nyanin,36 E. O’Brien,8 S. X. Oda,13 C. A. Ogilvie,30 M. Oka,70 K. Okada,60 Y. Onuki,59 A. Oskarsson,43 M. Ouchida,25,59 K. Ozawa,13 R. Pak,8 A. P. T. Palounek,41 V. Pantuev,28,66 V. Papavassiliou,53 B. H. Park,24 I. H. Park,20 J. Park,64 S. K. Park,35 W. J. Park,35 S. F. Pate,53 L. Patel,23 H. Pei,30 J.-C. Peng,27 H. Pereira,17 V. Peresedov,32 D.Yu. Peressounko,36 R. Petti,8,66 C. Pinkenburg,8 R. P. Pisani,8 M. Proissl,66 M. L. Purschke,8 A. K. Purwar,41 H. Qu,1,23 J. Rak,33,52 A. Rakotozafindrabe,38 I. Ravinovich,73 K. F. Read,55,68 S. Rembeczki,21 K. Reygers,47 D. Reynolds,65 V. Riabov,58 Y. Riabov,58,62 E. Richardson,44 N. Riveli,54 D. Roach,71 G. Roche,42,* S. D. Rolnick,9 M. Rosati,30 S. S. E. Rosendahl,43 P. Rosnet,42 P. Rukoyatkin,32 P. Ružička,29 V. L. Rykov,59 B. Sahlmueller,47,66 N. Saito,34,37,59,60 T. Sakaguchi,8 S. Sakai,70 K. Sakashita,59,69 V. Samsonov,51,58 M. Sano,70 M. Sarsour,23 T. Sato,70 S. Sawada,34 K. Sedgwick,9 J. Seele,14 R. Seidl,27,59,60 A.Yu. Semenov,30 V. Semenov,26,28 A. Sen,23 R. Seto,9 D. Sharma,73 I. Shein,26 T.-A. Shibata,59,69 K. Shigaki,25 M. Shimomura,70 K. Shoji,37,59 P. Shukla,5 A. Sickles,8 C. L. Silva,30,63 D. Silvermyr,55 C. Silvestre,17 K. S. Sim,35 B. K. Singh,4 C. P. Singh,4 V. Singh,4 M. Slunečka,10 A. Soldatov,26 R. A. Soltz,40 W. E. Sondheim,41 S. P. Sorensen,68 M. Soumya,65 I. V. Sourikova,8 F. Staley,17 P. W. Stankus,55 E. Stenlund,43 M. Stepanov,45,53 A. Ster,74 S. P. Stoll,8 T. Sugitate,25 C. Suire,56 A. Sukhanov,8 J. Sun,66 J. Sziklai,74 E. M. Takagui,63 A. Takahara,13 A. Taketani,59,60 R. Tanabe,70 Y. Tanaka,50 S. Taneja,66 K. Tanida,59,60,64 M. J. Tannenbaum,8 S. Tarafdar,4 A. Taranenko,51,65 P. Tarján,18 E. Tennant,53 H. Themann,66 T. L. Thomas,52 T. Todoroki,59,70 M. Togawa,37,59 A. Toia,66 L. Tomášek,29 M. Tomášek,16,29 Y. Tomita,70 H. Torii,25,59 R. S. Towell,1 V-N. Tram,38 I. Tserruya,73 Y. Tsuchimoto,13,25 T. Tsuji,13 C. Vale,8,30 H. Valle,71

We report a measurement of e + e − pairs from semileptonic heavy-flavor decays in d + Au collisions at √ s NN = 200 GeV. By exploring the mass and transverse-momentum dependence of the yield, the bottom decay contribution can be isolated from charm, and quantified by comparison to PYTHIA and MC @ NLO simulations. The resulting b ¯ b -production cross section is σ d Au b ¯ b = 1 . 37 ± 0 . 28 (stat) ± 0 . 46 (syst) mb, which is equivalent to a nucleon-nucleon cross section of σ NNbb = 3 . 4 ± 0 . 8 (stat) ± 1 . 1 (syst) μ b.

The PHENIX experiment has measured open heavy-flavor production via semileptonic decay over the transverse momentum range 1 < p T < 6 GeV =c at forward and backward rapidity ( 1 . 4 < j y j < 2 . 0 ) in d þ Au and p þ p collisions at ffiffiffiffiffiffiffiffi s NN p ¼ 200 GeV. In central d þ Au collisions, relative to the yield in p þ p collisions scaled by the number of binary nucleon-nucleon collisions, a suppression is observed at forward rapidity (in the d -going direction) and an enhancement at backward rapidity (in the Au-going direction). Predictions using nuclear-modified-parton-distribution functions, even with additional nuclear-p T broadening, cannot simultaneously reproduce the data at both rapidity ranges, which implies that these models are incomplete and suggests the possible importance of final-state interactions in the asymmetric d þ Au collision system. These results can be used to probe cold-nuclear-matter effects, which may significantly affect heavy-quark production, in addition to helping constrain the magnitude of charmonia-breakup effects in nuclear matter

We present a measurement of the cross section and transverse single-spin asymmetry (AN) for. mesons at large pseudorapidity from root s = 200 GeV p up arrow + p collisions. The measured cross section for 0.5 < p(T) < 5.0 GeV/c and 3.0 < vertical bar eta vertical bar < 3.8 is well described by a next-to-leading-order perturbative-quantum-chromodynamics calculation. The asymmetries A(N) have been measured as a function of Feynman-x (x(F)) from 0.2 < vertical bar x(F)vertical bar < 0.7, as well as transverse momentum (p(T)) from 1.0 < p(T) < 4.5 GeV/c. The asymmetry averaged over positive x(F) is < A(N)> = 0.061 +/- 0.014. The results are consistent with prior transverse single-spin measurements of forward eta and pi(0) mesons at various energies in overlapping x(F) ranges. Comparison of different particle species can help to determine the origin of the large observed asymmetries in p up arrow + p collisions.

Adare, A.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Al-Bataineh, H.; Alexander, J.; Angerami, A.; Aoki, K.; Apadula, N.; Aramaki, Y.; Atomssa, E. T.; Averbeck, R.; Awes, T. C.; Azmoun, B.; Babintsev, V.; Bai, M.; Baksay, G.; Baksay, L.; Barish, K. N.; Bassalleck, B.; Basye, A. T.; Bathe, S.; Baublis, V.; Baumann, C.; Bazilevsky, A.; Belikov, S.; Belmont, R.; Bennett, R.; Bhom, J. H.; Blau, D. S.; Bok, J. S.; Boyle, K.; Brooks, M. L.; Buesching, H.; Bumazhnov, V.; Bunce, G.; Butsyk, S.; Campbell, S.; Caringi, A.; Chen, C-H; Chi, C. Y.; Chiu, M.; Choi, I. J.; Choi, J. B.; Choudhury, R. K.; Christiansen, Peter; Chujo, T.; Chung, P.; Chvala, O.; Cianciolo, V.

A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, K. Aoki, Y. Aramaki, E. T. Atomssa, R. Averbeck, T. C. Awes, B. Azmoun, V. Babintsev, M. Bai, G. Baksay, L. Baksay, K. N. Barish, B. Bassalleck, A. T. Basye, S. Bathe, V. Baublis, C. Baumann, A. Bazilevsky, S. Belikov,* R. Belmont, R. Bennett, A. Berdnikov, Y. Berdnikov, A.A. Bickley, J. S. Bok, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, C.M. Camacho, S. Campbell, C.-H. Chen, C. Y. Chi, M. Chiu, I. J. Choi, R.K. Choudhury, P. Christiansen, T. Chujo, P. Chung, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, M. Connors, P. Constantin, M. Csanád, T. Csörgő, T. Dahms, S. Dairaku, I. Danchev, K. Das, A. Datta, G. David, A. Denisov, A. Deshpande, E. J. Desmond, O. Dietzsch, A. Dion, M. Donadelli, O. Drapier, A. Drees, K.A. Drees, J.M. Durham, A. Durum, D. Dutta, S. Edwards, Y. V. Efremenko, F. Ellinghaus, T. Engelmore, A. Enokizono, H. En’yo, S. Esumi, B. Fadem, D. E. Fields, M. Finger, M. Finger, Jr., F. Fleuret, S. L. Fokin, Z. Fraenkel,* J. E. Frantz, A. Franz, A.D. Frawley, K. Fujiwara, Y. Fukao, T. Fusayasu, I. Garishvili, A. Glenn, H. Gong, M. Gonin, Y. Goto, R. Granier de Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, H.-Å. Gustafsson,* J. S. Haggerty, K. I. Hahn, H. Hamagaki, J. Hamblen, R. Han, J. Hanks, E. P. Hartouni, E. Haslum, R. Hayano, X. He, M. Heffner, T. K. Hemmick, T. Hester, J. C. Hill, M. Hohlmann, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, D. Hornback, S. Huang, T. Ichihara, R. Ichimiya, J. Ide, Y. Ikeda, K. Imai, M. Inaba, D. Isenhower, M. Ishihara, T. Isobe, M. Issah, A. Isupov, D. Ivanischev, B. V. Jacak, J. Jia, J. Jin, B.M. Johnson, K. S. Joo, D. Jouan, D. S. Jumper, F. Kajihara, S. Kametani, N. Kamihara, J. Kamin, J. H. Kang, J. Kapustinsky, K. Karatsu, D. Kawall, M. Kawashima, A.V. Kazantsev, T. Kempel, A. Khanzadeev, K.M. Kijima, B. I. Kim, D. H. Kim, D. J. Kim, E. Kim, E. J. Kim, S. H. Kim, Y. J. Kim, E. Kinney, K. Kiriluk, Á. Kiss, E. Kistenev, C. Klein-Boesing, L. Kochenda, B. Komkov, M. Konno, J. Koster, D. Kotchetkov, A. Kozlov, A. Král, A. Kravitz, G. J. Kunde, K. Kurita, M. Kurosawa, Y. Kwon, G. S. Kyle, R. Lacey, Y. S. Lai, J. G. Lajoie, A. Lebedev, D.M. Lee, J. Lee, K. Lee, K. B. Lee, K. S. Lee, M. J. Leitch, M.A. L. Leite, E. Leitner, B. Lenzi, X. Li, P. Liebing, L. A. Linden Levy, T. Liška, A. Litvinenko, H. Liu, M.X. Liu, B. Love, R. Luechtenborg, D. Lynch, C. F. Maguire, Y. I. Makdisi, A. Malakhov, M.D. Malik, V. I. Manko, E. Mannel, Y. Mao, H. Masui, F. Matathias, M. McCumber, P. L. McGaughey, N. Means, B. Meredith, Y. Miake, A. C. Mignerey, P. Mikeš, K. Miki, A. Milov, M. Mishra, J. T. Mitchell, A.K. Mohanty, Y. Morino, A. Morreale, D. P. Morrison, T. V. Moukhanova, J. Murata, S. Nagamiya, J. L. Nagle, M. Naglis, M. I. Nagy, I. Nakagawa, Y. Nakamiya, T. Nakamura, K. Nakano, J. Newby, M. Nguyen, R. Nouicer, A. S. Nyanin, E. O’Brien, S. X. Oda, C. A. Ogilvie, M. Oka, K. Okada, Y. Onuki, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, V. Pantuev, V. Papavassiliou, I. H. Park, J. Park, S. K. Park, W. J. Park, S. F. Pate, H. Pei, J.-C. Peng, H. Pereira, V. Peresedov, D. Yu. Peressounko, C. Pinkenburg, R. P. Pisani, M. Proissl, M. L. Purschke, A. K. Purwar, H. Qu, J. Rak, A. Rakotozafindrabe, I. Ravinovich, K. F. Read, K. Reygers, V. Riabov, Y. Riabov, E. Richardson, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, C. A. Rosen, S. S. E. Rosendahl, P. Rosnet, P. Rukoyatkin, P. Ružička, B. Sahlmueller, N. Saito, T. Sakaguchi, K. Sakashita, V. Samsonov, S. Sano, T. Sato, S. Sawada, K. Sedgwick, J. Seele, R. Seidl, A.Yu. Semenov, R. Seto, D. Sharma, I. Shein, T.-A. Shibata, K. Shigaki, M. Shimomura, K. Shoji, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, C. Silvestre, K. S. Sim, B. K. Singh, C. P. Singh, V. Singh, M. Slunečka, R.A. Soltz, W. E. Sondheim, S. P. Sorensen, I. V. Sourikova, N.A. Sparks, P.W. Stankus, E. Stenlund, S. P. Stoll, T. Sugitate, A. Sukhanov, J. Sziklai, E.M. Takagui, A. Taketani, R. Tanabe, Y. Tanaka, K. Tanida, M. J. Tannenbaum, S. Tarafdar, A. Taranenko, P. Tarján, H. Themann, T. L. Thomas, M. Togawa, A. Toia, L. Tomášek, H. Torii, R. S. Towell, I. Tserruya, Y. Tsuchimoto, C. Vale, H. Valle, H.W. van Hecke, E. Vazquez-Zambrano, A. Veicht, J. Velkovska, R. Vértesi, A. A. Vinogradov, M. Virius, V. Vrba, E. Vznuzdaev, X. R. Wang, D. Watanabe, K. Watanabe, Y. Watanabe, F. Wei, R. Wei, J. Wessels, S. N. White, D. Winter, J. P. Wood, C. L. Woody, R.M. Wright, M. Wysocki, W. Xie, Y. L. Yamaguchi, K. Yamaura, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, Z. You, G. R. Young, I. Younus, I. E. Yushmanov, W.A. Zajc, C. Zhang, S. Zhou, and L. Zolin PRL 109, 122302 (2012) P HY S I CA L R EV I EW LE T T E R S week ending 21 SEPTEMBER 2012

B.B.Back, M.D.Baker, D.S.Barton, R.R.Betts, R.Bindel, A.Budzanowski, W.Busza, A.Carroll, J.Corbo, M.P.Decowski, E.Garcia, N.George, K.Gulbrandsen, S.Gushue, C.Halliwell, J.Hamblen, C.Henderson, D.Hicks, D.Hofman, R.S.Hollis, R.Ho lyński, B.Holzman, A.Iordanova, E.Johnson, J.Kane, J.Katzy, N.Khan, W.Kucewicz, P.Kulinich, C.M.Kuo, W.T.Lin, S.Manly, D.McLeod, J.Micha lowski, A.Mignerey, J.Mülmenstädt, R.Nouicer, A.Olszewski, R.Pak, I.C.Park, H.Pernegger, M.Rafelski, M.Rbeiz, C.Reed, L.P.Remsberg, M.Reuter, C.Roland, G.Roland, L.Rosenberg, J. Sagerer, P.Sarin, P.Sawicki, W.Skulski, S.G.Steadman, P.Steinberg, G.S.F.Stephans, M.Stodulski, A.Sukhanov, J.-L.Tang, R.Teng, A.Trzupek, C.Vale, G.J.van Nieuwenhuizen, R.Verdier, B.Wadsworth, F.L.H.Wolfs, B.Wosiek, K.Woźniak, A.H.Wuosmaa, B.Wys louch (PHOBOS Collaboration) 1 Physics Division, Argonne National Laboratory, Argonne, IL 60439-4843 2 Chemistry and C-A Departments, Brookhaven National Laboratory, Upton, NY 11973-5000 3 Institute of Nuclear Physics, Kraków, Poland 4 Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA 02139-4307 5 Department of Physics, National Central University, Chung-Li, Taiwan 6 Department of Physics, University of Illinois at Chicago, Chicago, IL 60607-7059 7 Department of Chemistry, University of Maryland, College Park, MD 20742 8 Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627 (February 8, 2008)