We present a measurement of the W boson mass in W-->e(nu) decays using 1 fb-1 of data collected with the D0 detector during Run II of the Fermilab Tevatron collider. With a sample of 499830 W-->e(nu) candidate events, we measure M(W)=80.401+/-0.043 GeV. This is the most precise measurement from a single experiment.

This report presents a conceptual design of a large solenoid for studying physics at the SSC. The parameters and nature of the detector have been chosen based on present estimates of what is required to allow the study of heavy quarks, supersymmetry, heavy Higgs particles, WW scattering at large invariant masses, new W and Z bosons, and very large momentum transfer parton-parton scattering. Simply stated, the goal is to obtain optimum detection and identification of electrons, muons, neutrinos, jets, W's and Z's over a large rapidity region. The primary region of interest extends over +-3 units of rapidity, although the calorimetry must extend to +-5.5 units if optimal missing energy resolution is to be obtained. A magnetic field was incorporated because of the importance of identifying the signs of the charges for both electrons and muons and because of the added possibility of identifying tau leptons and secondary vertices. In addition, the existence of a magnetic field may prove useful for studying new physics processes about which we currently have no knowledge. Since hermeticity of the calorimetry is extremely important, the entire central and endcap calorimeters were located inside the solenoid. This does not at the moment seem to producemore » significant problems (although many issues remain to be resolved) and in fact leads to a very effective muon detector in the central region.« less

Precise Measurement of the Ao Magnetic Moment I. Schachinger, (' G. Bunce, P. T. Cox, T. Devlin, J. Dworkin, B. Edelman, ('~ R. T. Edwards, & R. Handler, K. Heller, &' R. March, P. Martin, ( ~ O. E. Overseth, I. Pondrom, M. Sheaff, and P. Skubic Physics Department, University of Michigan, Ann Arbor, Michigan 48109, and Physics Department, Rutgers —The State University, Piscataway, Ãew Jersey 08854, and Physics Department, University of Wisconsin, Madison, wisconsin 53706 (Received 8 September 1978)

The discovery of hyperon polarization at high energy' gives insight into the dynamics of baryon interactions and also furnishes a method for precise measurements of hyperon moments which, in turn, test composite models of baryon structure. This Letter reports a new me3,4 + ea surement of the X magnetic moment, and the polarization of inclusively produced X+ hyperons. Our moment divers by more than three standard deviations from a recent measurement of comparable precision. The polarization of Z+ hyperons was measured by the asymmetry of the angular distribution in X+ pz . The magnetic moment of the Z+ was determined by precession of the spin in a magnetic field. The experiment was performed in the M2 beam line at Fermilab. The apparatus (Fig. 1) and data taking were described elsewh 67 here. The 400-GeV/c proton beam was directed onto a Be target at angles of +5 or —5 mrad with respect to the Z, + direction. A 5.3-m-long collimator in a 1.24-T downward field defined a 10-rnrad curved channel for the g+ ibeam. The coordinate system at production has +z along the Z+ momentum, +y upwards, and x =y&z. The decay chain Z+ pz, z 2y was detected by a wire-chamber spectrometer and a lead-glass array (PbG). The trigger required a charged particle in the spectrometer (S~ C4 PC), and at least one y in the lead glass (T PbG). Two radiation lengths of lead were placed before C5 above and below the M3 aperture to shower wide-angle y's for position determination in C5. Event categories were based on the amount of information present. Gamma categories were events with only one y in PbG and the other undetected, one y in PbG and position data on the other in C5, or both y's in PbG. Charged-track data fell in two categories: 60% Ml 40O Gev PROTONS S2 C1 C2 C3 C4 M3 Cs@ C7 LEAD GLASS

Highly treated effluent from the regional wastewater treatment plants in the Las Vegas basin currently discharges into the Las Vegas Wash and is conveyed to the Las Vegas Bay of Lake Mead. The Systems Conveyance and Operations Program's (SCOP) goal is to collect the majority of the region's highly treated effluent and convey the reclaimed water directly to a deep basin of Lake Mead, bypassing the Las Vegas Wash and Bay, thereby preserving the water quality of the bay. A conveyance system of gravity and pump pressurized pipelines and tunnels are being designed to deliver the reclaimed water directly to Lake Mead. This paper addresses the design methods for the pressurized steel liner of the Reach 3 Tunnel drop shaft which connects the in-trench pipeline and tunnel segments of the project. The vertical drop between the 10-foot diameter steel pipeline and 10-foot diameter steel lined pressure tunnel is approximately 99 feet. The conveyance system is designed to transport a maximum flow of 617 million gallons per day (mgd), the peak hour flow in the year 2050. The tunnel portion of the project is required to convey the water under the Las Vegas Wash and through the River Mountains with minimal impact to the surface above. The drop shaft changes the flow from the horizontal direction of the pipeline to the vertical direction of the shaft and then back to the horizontal orientation of the tunnel thereby creating large unbalanced hydraulic thrusts which must be resisted by the design. The directional and elevation changes of the drop shaft must be achieved with minimal head loss to preserve pressure head at the terminus of the tunnel which feeds two 8 megawatt hydroelectric turbines. Access to the shaft and tunnel must also be provided. The drop shaft serves as a high point to vent air when filling or draining and as an air trap for pressurized air release during normal operation.

We use the three lepton and missing energy trilepton signature to search for chargino-neutralino production with 2.0 fb;{-1} of integrated luminosity collected by the CDF II experiment at the Tevatron pp[over ] collider. We expect an excess of approximately 11 supersymmetric events for a choice of parameters of the mSUGRA model, but our observation of 7 events is consistent with the standard model expectation of 6.4 events. We constrain the mSUGRA model of supersymmetry and rule out chargino masses up to 145 GeV/c;{2} for a specific choice of parameters.

T. Aaltonen, J. Adelman, T. Akimoto, M.G. Albrow, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, A. Apresyan, T. Arisawa, A. Artikov, W. Ashmanskas, A. Attal, A. Aurisano, F. Azfar, P. Azzurri, W. Badgett, A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett, V. Bartsch, G. Bauer, P.-H. Beauchemin, F. Bedeschi, P. Bednar, D. Beecher, S. Behari, G. Bellettini, J. Bellinger, D. Benjamin, A. Beretvas, J. Beringer, A. Bhatti, M. Binkley, D. Bisello, I. Bizjak, R. E. Blair, C. Blocker, B. Blumenfeld, A. Bocci, A. Bodek, V. Boisvert, G. Bolla, D. Bortoletto, J. Boudreau, A. Boveia, B. Brau, A. Bridgeman, L. Brigliadori, C. Bromberg, E. Brubaker, J. Budagov, H. S. Budd, S. Budd, K. Burkett, G. Busetto, P. Bussey, A. Buzatu, K. L. Byrum, S. Cabrera, C. Calancha, M. Campanelli, M. Campbell, F. Canelli, A. Canepa, D. Carlsmith, R. Carosi, S. Carrillo, S. Carron, B. Casal, M. Casarsa, A. Castro, P. Catastini, D. Cauz, V. Cavaliere, M. Cavalli-Sforza, A. Cerri, L. Cerrito, S. H. Chang, Y. C. Chen, M. Chertok, G. Chiarelli, G. Chlachidze, F. Chlebana, K. Cho, D. Chokheli, J. P. Chou, G. Choudalakis, S. H. Chuang, K. Chung, W.H. Chung, Y. S. Chung, C. I. Ciobanu, M.A. Ciocci, A. Clark, D. Clark, G. Compostella, M. E. Convery, J. Conway, K. Copic, M. Cordelli, G. Cortiana, D. J. Cox, F. Crescioli, C. Cuenca Almenar, J. Cuevas, R. Culbertson, J. C. Cully, D. Dagenhart, M. Datta, T. Davies, P. de Barbaro, S. De Cecco, A. Deisher, G. De Lorenzo, M. Dell’Orso, C. Deluca, L. Demortier, J. Deng, M. Deninno, P. F. Derwent, T. Devlin, G. P. di Giovanni, C. Dionisi, B. Di Ruzza, J. R. Dittmann, M. D’Onofrio, S. Donati, P. Dong, J. Donini, T. Dorigo, S. Dube, J. Efron, A. Elagin, R. Erbacher, D. Errede, S. Errede, R. Eusebi, H. C. Fang, S. Farrington, W. T. Fedorko, R. G. Feild, M. Feindt, J. P. Fernandez, C. Ferrazza, R. Field, G. Flanagan, R. Forrest, M. Franklin, J. C. Freeman, I. Furic, M. Gallinaro, J. Galyardt, F. Garberson, J. E. Garcia, A. F. Garfinkel, K. Genser, H. Gerberich, D. Gerdes, A. Gessler, S. Giagu, V. Giakoumopoulou, P. Giannetti, K. Gibson, J. L. Gimmell, C.M. Ginsburg, N. Giokaris, M. Giordani, P. Giromini, M. Giunta, G. Giurgiu, V. Glagolev, J. Glatzer, D. Glenzinski, M. Gold, N. Goldschmidt, A. Golossanov, G. Gomez, G. Gomez-Ceballos, M. Goncharov, O. González, I. Gorelov, A. T. Goshaw, K. Goulianos, A. Gresele, S. Grinstein, C. Grosso-Pilcher, R. C. Group, U. Grundler, J. Guimaraes da Costa, Z. Gunay-Unalan, C. Haber, K. Hahn, S. R. Hahn, E. Halkiadakis, B.-Y. Han, J. Y. Han, R. Handler, F. Happacher, K. Hara, D. Hare, M. Hare, S. Harper, R. F. Harr, R.M. Harris, M. Hartz, K. Hatakeyama, J. Hauser, C. Hays, M. Heck, A. Heijboer, B. Heinemann, J. Heinrich, C. Henderson, M. Herndon, J. Heuser, S. Hewamanage, D. Hidas, C. S. Hill, D. Hirschbuehl, A. Hocker, S. Hou, M. Houlden, S.-C. Hsu, B. T. Huffman, R. E. Hughes, U. Husemann, J. Huston, J. Incandela, G. Introzzi, M. Iori, A. Ivanov, E. James, B. Jayatilaka, E. J. Jeon, M.K. Jha, S. Jindariani, W. Johnson, M. Jones, K. K. Joo, S. Y. Jun, J. E. Jung, T. R. Junk, T. Kamon, D. Kar, P. E. Karchin, Y. Kato, R. Kephart, J. Keung, V. Khotilovich, B. Kilminster, D.H. Kim, H. S. Kim, J. E. Kim, M. J. Kim, S. B. Kim, S. H. Kim, Y.K. Kim, N. Kimura, L. Kirsch, S. Klimenko, B. Knuteson, B. R. Ko, S. A. Koay, K. Kondo, D. J. Kong, J. Konigsberg, A. Korytov, A.V. Kotwal, M. Kreps, J. Kroll, D. Krop, N. Krumnack, M. Kruse, V. Krutelyov, T. Kubo, T. Kuhr, N. P. Kulkarni, M. Kurata, Y. Kusakabe, S. Kwang, A. T. Laasanen, S. Lami, S. Lammel, M. Lancaster, R. L. Lander, K. Lannon, A. Lath, G. Latino, I. Lazzizzera, T. LeCompte, E. Lee, H. Lee, S.W. Lee, S. Leone, J. D. Lewis, C. S. Lin, J. Linacre, M. Lindgren, E. Lipeles, A. Lister, D.O. Litvintsev, C. Liu, T. Liu, N. S. Lockyer, A. Loginov, M. Loreti, L. Lovas, R.-S. Lu, D. Lucchesi, J. Lueck, C. Luci, P. Lujan, P. Lukens, G. Lungu, L. Lyons, J. Lys, R. Lysak, E. Lytken, P. Mack, D. MacQueen, R. Madrak, K. Maeshima, K. Makhoul, T. Maki, P. Maksimovic, S. Malde, S. Malik, G. Manca, A. Manousakis-Katsikakis, F. Margaroli, C. Marino, C. P. Marino, A. Martin, V. Martin, M. Martı́nez, R. Martı́nez-Balları́n, T. Maruyama, P. Mastrandrea, T. Masubuchi, M. E. Mattson, P. Mazzanti, K. S. McFarland, P. McIntyre, R. McNulty, A. Mehta, P. Mehtala, A. Menzione, P. Merkel, C. Mesropian, T. Miao, N. Miladinovic, R. Miller, C. Mills, M. Milnik, A. Mitra, G. Mitselmakher, H. Miyake, N. Moggi, C. S. Moon, R. Moore, M. J. Morello, J. Morlok, P. Movilla Fernandez, J. Mülmenstädt, A. Mukherjee, Th. Muller, R. Mumford, PRL 101, 251801 (2008) P HY S I CA L R EV I EW LE T T E R S week ending 19 DECEMBER 2008

We present a detailed description of a search for anomalous production of missing ET (6ET), jets, leptons (e; ; ), b-quarks, or additional photons in events containing two isolated, central (j j < 1:0) photons with ET > 12 GeV. The results are consistent with standard model expectations, with the possible exception of one event that has in addition to the two photons a central electron, a high-ET electromagnetic cluster, and large 6ET. We set limits using two speci c SUSY scenarios for production of diphoton events with 6ET. PACS numbers 13.85Rm, 12.60.Jv, 13.85.Qk, 14.80.Ly 4

We report the first evidence for a fully reconstructed decay mode of the B±c meson in the channel B±c→J/ψπ±, with J/ψ→μ+μ−. The analysis is based on an integrated luminosity of 360 pb−1 in p¯p collisions at 1.96 TeV center of mass energy collected by the Collider Detector at Fermilab. We observe 14.6±4.6 signal events with a background of 7.1±0.9 events, and a fit to the J/ψπ± mass spectrum yields a B±c mass of 6285.7±5.3(stat)±1.2(syst) MeV/c2. The probability of a peak of this magnitude occurring by random fluctuation in the search region is estimated as 0.012%.Received 23 May 2005DOI:https://doi.org/10.1103/PhysRevLett.96.082002©2006 American Physical Society

We report the first evidence for a fully reconstructed decay mode of the B(c)+- meson in the channel B(c)+- --> J/psi pi+-, with J/psi --> mu+ mu-. The analysis is based on an integrated luminosity of 360 pb(-1) in pp collisions at 1.96 TeV center of mass energy collected by the Collider Detector at Fermilab. We observe 14.6 +/- 4.6 signal events with a background of 7.1 +/- 0.9 events, and a fit to the J/psi pi+-mass spectrum yields a B(c)+- mass of 6285.7 +/- 5.3(stat) +/- 1.2(syst) MeV/c2. The probability of a peak of this magnitude occurring by random fluctuation in the search region is estimated as 0.012%.

We present a measurement of the Bc+ meson lifetime in the decay mode Bc+ --> J/Psie+nue using the Collider Detector at Fermilab II detector at the Fermilab Tevatron Collider. From a sample of about of 360 pb(-1) of pp collisions at square root of s = 1.96 TeV, we reconstruct J/Psie+ pairs with invariant mass in the kinematically allowed range 4< M(J/Psie) < 6 GeV/c2. A fit to the decay-length distribution of 238 signal events yields a measured Bc+ meson lifetime of 0.463(-0.065)(+0.073)(stat) +/- 0.036(syst) ps.

We present the results of a search for anomalous resonant production of tau lepton pairs with large invariant mass, the first such search using the CDF II Detector in Run II of the Tevatron pp collider. Such anomalous production could arise from various new physics processes. In a data sample corresponding to 195 pb(-1) of integrated luminosity we predict 2: 8 +/- 0: 5 events from standard model background processes and observe 4. We use this result to set limits on the production of heavy scalar and vector particles decaying to tau lepton pairs.

D. Acosta, T. Affolder, H. Akimoto, M. G. Albrow, D. Ambrose, D. Amidei, K. Anikeev, J. Antos, G. Apollinari, T. Arisawa, A. Artikov, T. Asakawa, W. Ashmanskas, F. Azfar, P. Azzi-Bacchetta, N. Bacchetta, H. Bachacou, W. Badgett, S. Bailey, P. de Barbaro, A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett, S. Baroiant, M. Barone, G. Bauer, F. Bedeschi, S. Behari, S. Belforte, W. H. Bell, G. Bellettini, J. Bellinger, D. Benjamin, J. Bensinger, A. Beretvas, J. Berryhill, A. Bhatti, M. Binkley, D. Bisello, M. Bishai, R. E. Blair, C. Blocker, K. Bloom, B. Blumenfeld, S. R. Blusk, A. Bocci, A. Bodek, G. Bolla, A. Bolshov, Y. Bonushkin, D. Bortoletto, J. Boudreau, A. Brandl, C. Bromberg, M. Brozovic, E. Brubaker, N. Bruner, J. Budagov, H. S. Budd, K. Burkett, G. Busetto, K. L. Byrum, S. Cabrera, P. Calafiura, M. Campbell, W. Carithers, J. Carlson, D. Carlsmith, W. Caskey, A. Castro, D. Cauz, A. Cerri, L. Cerrito, A.W. Chan, P. S. Chang, P.T. Chang, J. Chapman, C. Chen, Y. C. Chen, M.-T. Cheng, M. Chertok, G. Chiarelli, I. Chirikov-Zorin, G. Chlachidze, F. Chlebana, L. Christofek, M. L. Chu, J.Y. Chung, W.-H. Chung, Y. S. Chung, C. I. Ciobanu, A. G. Clark, M. Coca, A. Connolly, M. Convery, J. Conway, M. Cordelli, J. Cranshaw, R. Culbertson, D. Dagenhart, S. D’Auria, S. De Cecco, F. DeJongh, S. Dell’Agnello, M. Dell’Orso, S. Demers, L. Demortier, M. Deninno, D. De Pedis, P. F. Derwent, T. Devlin, C. Dionisi, J. R. Dittmann, A. Dominguez, S. Donati, M. D’Onofrio, T. Dorigo, N. Eddy, K. Einsweiler, E. Engels, Jr., R. Erbacher, D. Errede, S. Errede, R. Eusebi, Q. Fan, S. Farrington, R. G. Feild, J. P. Fernandez, C. Ferretti, R. D. Field, I. Fiori, B. Flaugher, L. R. Flores-Castillo, G.W. Foster, M. Franklin, J. Freeman, J. Friedman, Y. Fukui, I. Furic, S. Galeotti, A. Gallas, M. Gallinaro, T. Gao, M. Garcia-Sciveres, A. F. Garfinkel, P. Gatti, C. Gay, D.W. Gerdes, E. Gerstein, S. Giagu, P. Giannetti, K. Giolo, M. Giordani, P. Giromini, V. Glagolev, D. Glenzinski, M. Gold, N. Goldschmidt, J. Goldstein, G. Gomez, M. Goncharov, I. Gorelov, A.T. Goshaw, Y. Gotra, K. Goulianos, C. Green, A. Gresele, G. Grim, C. Grosso-Pilcher, M. Guenther, G. Guillian, J. Guimaraes da Costa, R. M. Haas, C. Haber, S. R. Hahn, E. Halkiadakis, C. Hall, T. Handa, R. Handler, F. Happacher, K. Hara, A. D. Hardman, R. M. Harris, F. Hartmann, K. Hatakeyama, J. Hauser, J. Heinrich, A. Heiss, M. Hennecke, M. Herndon, C. Hill, A. Hocker, K. D. Hoffman, R. Hollebeek, L. Holloway, S. Hou, B.T. Huffman, R. Hughes, J. Huston, J. Huth, H. Ikeda, C. Issever, J. Incandela, G. Introzzi, M. Iori, A. Ivanov, J. Iwai, Y. Iwata, B. Iyutin, E. James, M. Jones, U. Joshi, H. Kambara, T. Kamon, T. Kaneko, J. Kang, M. Karagoz Unel, K. Karr, S. Kartal, H. Kasha, Y. Kato, T. A. Keaffaber, K. Kelley, M. Kelly, R. D. Kennedy, R. Kephart, D. Khazins, T. Kikuchi, B. Kilminster, B. J. Kim, D. H. Kim, H. S. Kim, M. J. Kim, S. B. Kim, S. H. Kim, T. H. Kim, Y. K. Kim, M. Kirby, M. Kirk, L. Kirsch, S. Klimenko, P. Koehn, K. Kondo, J. Konigsberg, A. Korn, A. Korytov, K. Kotelnikov, E. Kovacs, J. Kroll, M. Kruse, V. Krutelyov, S. E. Kuhlmann, K. Kurino, T. Kuwabara, N. Kuznetsova, A.T. Laasanen, N. Lai, S. Lami, S. Lammel, J. Lancaster, K. Lannon, M. Lancaster, R. Lander, A. Lath, G. Latino, T. LeCompte, Y. Le, J. Lee, S.W. Lee, N. Leonardo, S. Leone, J. D. Lewis, K. Li, C. S. Lin, M. Lindgren, T. M. Liss, J. B. Liu, T. Liu, Y. C. Liu, D. O. Litvintsev, O. Lobban, N. S. Lockyer, A. Loginov, J. Loken, M. Loreti, D. Lucchesi, P. Lukens, S. Lusin, L. Lyons, J. Lys, R. Madrak, K. Maeshima, P. Maksimovic, L. Malferrari, M. Mangano, G. Manca, M. Mariotti, G. Martignon, M. Martin, A. Martin, V. Martin, M. Martı́nez, J. A. J. Matthews, P. Mazzanti, K. S. McFarland, P. McIntyre, M. Menguzzato, A. Menzione, P. Merkel, C. Mesropian, A. Meyer, T. Miao, R. Miller, J. S. Miller, H. Minato, S. Miscetti, M. Mishina, G. Mitselmakher, Y. Miyazaki, N. Moggi, E. Moore, R. Moore, Y. Morita, T. Moulik, M. Mulhearn, A. Mukherjee, T. Muller, A. Munar, P. Murat, S. Murgia, J. Nachtman, V. Nagaslaev, S. Nahn, H. Nakada, I. Nakano, R. Napora, F. Niell, C. Nelson, T. Nelson, C. Neu, M. S. Neubauer, D. Neuberger, C. Newman-Holmes, C-Y. P. Ngan, T. Nigmanov, H. Niu, L. Nodulman, A. Nomerotski, S. H. Oh, Y. D. Oh, T. Ohmoto, T. Ohsugi, R. Oishi, T. Okusawa, J. Olsen, W. Orejudos, C. Pagliarone, F. Palmonari, R. Paoletti, V. Papadimitriou, D. Partos, J. Patrick, G. Pauletta, M. Paulini, T. Pauly, C. Paus, D. Pellett, A. Penzo, L. Pescara, T. J. Phillips, G. Piacentino, J. Piedra, K.T. Pitts, A. Pompoš, L. Pondrom, G. Pope, T. Pratt, F. Prokoshin, J. Proudfoot, F. Ptohos, O. Pukhov, G. Punzi, J. Rademacker, A. Rakitine,

We report on a search for B(0)(s)-->micro(+)micro(-) and B(0)(d)-->micro(+)micro(-) decays in pp collisions at square root of s=1.96 TeV using 171 pb(-1) of data collected by the CDF II experiment at the Fermilab Tevatron Collider. The decay rates of these rare processes are sensitive to contributions from physics beyond the standard model. One event survives all our selection requirements, consistent with the background expectation. We derive branching ratio limits of B(B(0)(s)-->micro(+)micro(-))<5.8x10(-7) and B(B(0)(d)-->micro(+)micro(-))<1.5x10(-7) at 90% confidence level.

We present the results of a search for pair production of scalar top quarks (t(1)) in an R-parity violating supersymmetry scenario in 106 pb(-1) of pp collisions at square root of s=1.8 TeV collected by the Collider Detector at Fermilab. In this mode each t(1) decays into a tau lepton and a b quark. We search for events with two tau's, one decaying leptonically (e or mu) and one decaying hadronically, and two jets. No candidate events pass our final selection criteria. We set a 95% confidence level lower limit on the t(1) mass at 122 GeV/c(2) for Br(t(1)-->tau b)=1.