A solution to the MiniBooNE excess invoking rare three-body decays of the charged pions and kaons to new states in the MeV mass scale was recently proposed as a dark-sector explanation. This class of solution illuminates the fact that, while the charged pions were focused in the target-mode run, their decay products were isotropically suppressed in the beam-dump-mode run in which no excess was observed. This suggests a new physics solution correlated to the mesonic sector. We investigate an extended set of phenomenological models that can explain the MiniBooNE excess as a dark sector solution, utilizing long-lived particles that might be produced in the three-body decays of the charged mesons and the two-body anomalous decays of the neutral mesons. Over a broad set of interactions with the long-lived particles, we show that these scenarios can be compatible with constraints from LSND, KARMEN, and MicroBooNE, and evaluate the sensitivity of the ongoing and future data taken by the Coherent CAPTAIN Mills experiment (CCM) to a potential discovery in this parameter space.

We show results from the Coherent CAPTAIN Mills (CCM) 2019 engineering run which begin to constrain regions of parameter space for axion-like particles (ALPs) produced in electromagnetic particle showers in an 800 MeV proton beam dump, and further investigate the sensitivity of ongoing data-taking campaigns for the CCM200 upgraded detector. Based on beam-on background estimates from the engineering run, we make realistic extrapolations for background reduction based on expected shielding improvements, reduced beam width, and analysis-based techniques for background rejection. We obtain reach projections for two classes of signatures; ALPs coupled primarily to photons can be produced in the tungsten target via the Primakoff process, and then produce a gamma-ray signal in the Liquid Argon (LAr) CCM detector either via inverse Primakoff scattering or decay to a photon pair. ALPs with significant electron couplings have several additional production mechanisms (Compton scattering, $e^+e^-$ annihilation, ALP-bremsstrahlung) and detection modes (inverse Compton scattering, external $e^+e^-$ pair conversion, and decay to $e^+e^-$). In some regions, the constraint is marginally better than both astrophysical and terrestrial constraints. With the beginning of a three year run, CCM will be more sensitive to this parameter space by up to an order of magnitude for both ALP-photon and ALP-electron couplings. The CCM experiment will also have sensitivity to well-motivated parameter space of QCD axion models. It is only a recent realization that accelerator-based large volume liquid argon detectors designed for low energy coherent neutrino and dark matter scattering searches are also ideal for probing ALPs in the unexplored $\sim$MeV mass scale.

We report the first results of a search for leptophobic dark matter (DM) from the Coherent-CAPTAIN-Mills (CCM) liquid argon (LAr) detector. An engineering run with 120 photomultiplier tubes (PMTs) and 17.9×10^{20} protons on target (POT) was performed in fall 2019 to study the characteristics of the CCM detector. The operation of this 10-ton detector was strictly light based with a threshold of 50 keV and used coherent elastic scattering off argon nuclei to detect DM. Despite only 1.5 months of accumulated luminosity, contaminated LAr, and nonoptimized shielding, CCM's first engineering run has already achieved sensitivity to previously unexplored parameter space of light dark matter models with a baryonic vector portal. With an expected background of 115 005 events, we observe 115 005+16.5 events which is compatible with background expectations. For a benchmark mediator-to-DM mass ratio of m_{V_{B}}/m_{χ}=2.1, DM masses within the range 9  MeV≲m_{χ}≲50  MeV are excluded at 90% C. L. in the leptophobic model after applying the Feldman-Cousins test statistic. CCM's upgraded run with 200 PMTs, filtered LAr, improved shielding, and 10 times more POT will be able to exclude the remaining thermal relic density parameter space of this model, as well as probe new parameter space of other leptophobic DM models.

This paper describes the operation of the Coherent CAPTAIN-Mills (CCM) detector located at the Los Alamos Neutron Science Center at Los Alamos National Laboratory. CCM is a 10-ton liquid argon detector located 20 meters from a high flux neutron/neutrino source and is designed to search for sterile neutrinos (v(s) 's) and light dark matter (LDM). An engineering run was performed in fall 2019 to study the characteristics of the CCM120 detector by searching for coherent scattering signals consistent with v(s)'s and LDM resulting from the production and decays of pi(+) and pi(0) in the tungsten target. New parameter space in a leptophobic dark matter (DM) model was excluded for DM masses between similar to 2.0 and 30 MeV. The lessons learned from this run have guided the development and construction of the new CCM200 detector that will begin operations in 2021 and significantly improve on these searches.

A.A. Aguilar-Arevalo,8 D. S.M. Alves,6 S. Biedron,9 J. Boissevain,1 M. Chavez−Estrada,8 J. Plata-Salas,8 J.M. Conrad,7 R.L. Cooper,6, 10 A. Diaz,7 J.R. Distel,6 J.C. D’Olivo,8 E. Dunton,2 B. Dutta,11 D. Fields,9 M. Gold,9 E. Guarincerri,6 E.C. Huang,6 N. Kamp,7 D. Kim,11 W.C. Louis,6 R. Mahapatra,11 S. Maludze,11 J. Mirabal,6 N. Mishra,11 P. deNiverville,6 V. Pandey,5 D. Poulson,6 H. Ray,5 E. Renner,6 T.J. Schaub,9 A. Schneider,7 M.H. Shaevitz,2 D. Smith,4 W. Sondheim,6 A.M. Szelc,3 C. Taylor,6 A. Thompson,11 W.H. Thompson,6 M. Tripathi,5 R.T. Thornton,6 R. Van Berg,1 R.G. Van de Water,6 and S. Verma11 (The CCM Collaboration) Bartoszek Engineering, Aurora, IL 60506, USA Columbia University, New York, NY 10027, USA University of Edinburgh, Edinburgh, United Kingdom Embry−Riddle Aeronautical University, Prescott, AZ 86301, USA University of Florida, Gainesville, FL 32611, USA Los Alamos National Laboratory, Los Alamos, NM 87545, USA Massachusetts Institute of Technology, Cambridge, MA 02139, USA Universidad Nacional Autónoma de México, CDMX 04510, México University of New Mexico, Albuquerque, NM 87131, USA New Mexico State University, Las Cruces, NM 88003, USA Texas A&M University, College Station, TX 77843, USA

Advanced detector R&D requires performing computationally intensive and detailed simulations as part of the detector-design optimization process. We propose a general approach to this process based on Bayesian optimization and machine learning that encodes detector requirements. As a case study, we focus on the design of the dual-radiator Ring Imaging Cherenkov (dRICH) detector under development as a potential component of the particle-identification system at the future Electron-Ion Collider (EIC). The EIC is a US-led frontier accelerator project for nuclear physics, which has been proposed to further explore the structure and interactions of nuclear matter at the scale of sea quarks and gluons. We show that the detector design obtained with our automated and highly parallelized framework outperforms the baseline dRICH design within the assumptions of the current model. Our approach can be applied to any detector R&D, provided that realistic simulations are available.

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.

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section of phi(1020)-meson production at forward rapidity in p + p collisions at root s = 510 GeV via the dimuon decay channel. The partial cross section in the rapidity and P-T ranges 1.2 < vertical bar y vertical bar < 2.2 and 2 < p(T) < 7 GeV/c is sigma(phi) = [2.28 +/- 0.09(stat) +/- 0.14(syst) +/- 0.27(norm)] x 10(-2) mb. The energy dependence of sigma(phi) (1.2 < vertical bar y vertical bar < 2.2,2 < p(T) < 5 GeV/c) is studied using the PHENIX measurements at root s = 200 and 510 GeV and the Large Hadron Collider measurements at root s = 2.76 and 7 TeV. The experimental results arc compared to various event generator predictions (PYTHIA6, PYTHIA8, PHOJET, AMPT, EPOS3, and EPOS-LHC).

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,

An Electron-Ion Collider (EIC) has been proposed to further explore the strong force and QCD, focusing on the structure and the interaction of gluon-dominated matter. A generic detector R&D program (EIC PID consortium) for the particle identification in EIC experiments was formed to explore technologically advanced solutions in this scope. In this context two Ring Imaging Cherenkov (RICH) counters have been proposed: a modular RICH detector which consists of an aerogel radiator, a Fresnel lens, a mirrored box, and pixelated photon sensor; a dual-radiator RICH, consisting of an aerogel radiator and C2F6 gas in a mirror-focused configuration. We present the simulations of the two detectors and their estimated performance.

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 powerful new electron-ion collider (EIC) has been recommended in the 2015 Long Range Plan for Nuclear Science for probing the partonic structure inside nucleons and nuclei with unprecedented precision and versatility [1]. EIC detectors are currently under development [2], all of which require hadron identification over a broad kinematic range. A prototype ring imaging Cherenkov detector has been developed for hadron identification in the momentum range from 3 GeV/c to 10 GeV/c. The key feature of this new detector is a compact and modular design, achieved by using aerogel as radiator and a Fresnel lens for ring focusing. In this paper, the results from a beam test of a prototype device at Fermilab are reported. Published by Elsevier B.V.

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

A new silicon detector has been developed to provide the PHENIX experiment with precise charged particle tracking at forward and backward rapidity. The Forward Silicon Vertex Tracker (FVTX) was installed in PHENIX prior to the 2012 run period of the Relativistic Heavy Ion Collider (RHIC). The FVTX is composed of two annular endcaps, each with four stations of silicon mini-strip sensors, covering a rapidity range of 1.2<|η|<2.2 that closely matches the two existing PHENIX muon arms. Each station consists of 48 individual silicon sensors, each of which contains two columns of mini-strips with 75 μm pitch in the radial direction and lengths in the ϕ direction varying from 3.4 mm at the inner radius to 11.5 mm at the outer radius. The FVTX has approximately 0.54 million strips in each endcap. These are read out with FPHX chips, developed in collaboration with Fermilab, which are wire bonded directly to the mini-strips. The maximum strip occupancy reached in central Au–Au collisions is approximately 2.8%. The precision tracking provided by this device makes the identification of muons from secondary vertices away from the primary event vertex possible. The expected distance of closest approach (DCA) resolution of 200 μm or better for particles with a transverse momentum of 5 GeV/c will allow identification of muons from relatively long-lived particles, such as D and B mesons, through their broader DCA distributions.

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.