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New results on silicon microstrip detectors of CMS tracker

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment Elsevier 447:1-2 (2000) 142-150

Authors:

N Demaria, S Albergo, M Angarano, P Azzi, E Babucci, N Bacchetta, A Bader, G Bagliesi, A Basti, U Biggeri, GM Bilei, D Bisello, D Boemi, G Bolla, F Bosi, L Borrello, D Bortoletto, C Bozzi, S Braibant, H Breuker, M Bruzzi, A Buffini, S Busoni, A Candelori, A Caner, R Castaldi, A Castro, E Catacchini, B Checcucci, P Ciampolini, C Civinini, D Creanza, R D'Alessandro, M Da Rold, M de Palma, R Dell'Orso, R Della Marina, S Dutta, C Eklund, A Elliott-Peisert, G Favro, L Feld, L Fiore, E Focardi, M French, K Freudenreich, A Fürtjes, A Giassi, M Giorgi, A Giraldo, B Glessing, WH Gu, G Hall, R Hammerstrom, T Hebbeker, J Hrubec, M Huhtinen, A Kaminsky, V Karimaki, Koenig, M Krammer, P Lariccia, M Lenzi, M Loreti, K Luebelsmeyer, W Lustermann, P Mättig, G Maggi, M Mannelli, G Mantovani, A Marchioro, C Mariotti, G Martignon, B Mc Evoy, M Meschini, A Messineo, E Migliore, S My, A Paccagnella, F Palla, D Pandoulas, A Papi, G Parrini, D Passeri, M Pieri, S Piperov, R Potenza, V Radicci, F Raffaelli, M Raymond, A Santocchia, B Schmitt, G Selvaggi, L Servoli, G Sguazzoni, R Siedling, L Silvestris, K Skog, A Starodumov, I Stavitski, G Stefanini, P Tempesta, G Tonelli, A Tricomi, T Tuuva, C Vannini, PG Verdini, G Viertel, Z Xie, Li Yahong, S Watts, B Wittmer
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Probing Balitsky-Fadin-Kuraev-Lipatov dynamics in the dijet cross section at large rapidity intervals in pp collisions at sqrt[s]=1800 and 630 GeV.

Physical review letters 84:25 (2000) 5722-5727

Authors:

B Abbott, M Abolins, V Abramov, BS Acharya, DL Adams, M Adams, V Akimov, GA Alves, N Amos, EW Anderson, MM Baarmand, VV Babintsev, L Babukhadia, A Baden, B Baldin, S Banerjee, J Bantly, E Barberis, P Baringer, JF Bartlett, U Bassler, A Bean, A Belyaev, SB Beri, G Bernardi, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, A Boehnlein, NI Bojko, F Borcherding, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, V Buescher, VS Burtovoi, JM Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, KM Chan, SV Chekulaev, W Chen, DK Cho, S Choi, S Chopra, BC Choudhary, JH Christenson, M Chung, D Claes, AR Clark, WG Cobau, J Cochran, L Coney, B Connolly, WE Cooper, D Coppage, D Cullen-Vidal, MA Cummings, D Cutts, OI Dahl, K Davis, K De, K Del Signore, M Demarteau, D Denisov, SP Denisov, HT Diehl, M Diesburg, G Di Loreto, P Draper, Y Ducros, LV Dudko, SR Dugad, A Dyshkant, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, J Estrada, H Evans, VN Evdokimov, T Fahland, S Feher, D Fein, T Ferbel, HE Fisk, Y Fisyak, E Flattum, F Fleuret, M Fortner, KC Frame, S Fuess, E Gallas, AN Galyaev, P Gartung, V Gavrilov, RJ Genik, K Genser, CE Gerber, Y Gershtein, B Gibbard, R Gilmartin, G Ginther, B Gobbi, B Gómez, G Gómez, PI Goncharov, JL González Solís, H Gordon, LT Goss, K Gounder, A Goussiou, N Graf, PD Grannis, JA Green, H Greenlee, S Grinstein, P Grudberg, S Grünendahl, G Guglielmo, A Gupta, SN Gurzhiev, G Gutierrez, P Gutierrez, NJ Hadley, H Haggerty, S Hagopian, V Hagopian, KS Hahn, RE Hall, P Hanlet, S Hansen, JM Hauptman, C Hays, C Hebert, D Hedin, AP Heinson, U Heintz, T Heuring, R Hirosky, JD Hobbs, B Hoeneisen, JS Hoftun, AS Ito, SA Jerger, R Jesik, T Joffe-Minor, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, SY Jun, A Juste, S Kahn, E Kajfasz, D Karmanov, D Karmgard, R Kehoe, SK Kim, B Klima, C Klopfenstein, B Knuteson, W Ko, JM Kohli, AV Kostritskiy, J Kotcher, AV Kotwal, AV Kozelov, EA Kozlovsky, J Krane, MR Krishnaswamy, S Krzywdzinski, M Kubantsev, S Kuleshov, Y Kulik, S Kunori, G Landsberg, A Leflat, F Lehner, J Li, QZ Li, JG Lima, D Lincoln, SL Linn, J Linnemann, R Lipton, JG Lu, A Lucotte, L Lueking, C Lundstedt, AK Maciel, RJ Madaras, V Manankov, S Mani, HS Mao, R Markeloff, T Marshall, MI Martin, RD Martin, KM Mauritz, B May, AA Mayorov, R McCarthy, J McDonald, T McKibben, T McMahon, HL Melanson, M Merkin, KW Merritt, C Miao, H Miettinen, D Mihalcea, A Mincer, CS Mishra, N Mokhov, NK Mondal, HE Montgoemry, M Mostafa, H da Motta, E Nagy, F Nang, M Narain, VS Narasimham, HA Neal, JP Negret, S Negroni, D Norman, L Oesch, V Oguri, B Olivier, N Oshima, P Padley, LJ Pan, A Para, N Parashar, R Partridge, N Parua, M Paterno, A Patwa, B Pawlik, J Perkins, M Peters, R Piegaia, H Piekarz, BG Pope, E Popkov, HB Prosper, S Protopopescu, J Qian, PZ Quintas, R Raja, S Rajagopalan, NW Reay, S Reucroft, M Rijssenbeek, T Rockwell, M Roco, P Rubinov, R Ruchti, J Rutherfoord, A Santoro, L Sawyer, RD Schamberger, H Schellman, A Schwartzman, J Sculli, N Sen, E Shabalina, HC Shankar, RK Shivpuri, D Shpakov, M Shupe, RA Sidwell, H Singh, JB Singh, V Sirotenko, P Slattery, E Smith, RP Smith, R Snihur, GR Snow, J Snow, S Snyder, J Solomon, XF Song, V Sorín, M Sosebee, N Sotnikova, M Souza, NR Stanton, G Steinbrück, RW Stephens, ML Stevenson, F Stichelbaut, D Stoker, V Stolin, DA Stoyanova, M Strauss, K Streets, M Strovink, L Stutte, A Sznajder, J Tarazi, W Taylor, S Tentindo-Repond, TL Thomas, J Thompson, D Toback, TG Trippe, AS Turcot, PM Tuts, P van Gemmeren, V Vaniev, N Varelas, AA Volkov, AP Vorobiev, HD Wahl, H Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, JT White, D Whiteson, JA Wightman, S Willis, SJ Wimpenny, JV Wirjawan, J Womersley, DR Wood, R Yamada, P Yamin, T Yasuda, K Yip, S Youssef, J Yu, Z Yu, M Zanabria, H Zheng, Z Zhou, ZH Zhu, M Zielinski, D Zieminska, A Zieminski, V Zutshi, EG Zverev, A Zylberstejn

Abstract:

Inclusive dijet production at large pseudorapidity intervals (Deltaeta) between the two jets has been suggested as a regime for observing Balitsky-Fadin-Kuraev-Lipatov (BFKL) dynamics. We have measured the dijet cross section for large Deltaeta in pp collisions at sqrt[s]=1800 and 630 GeV using the D0 detector. The partonic cross section increases strongly with the size of Deltaeta. The observed growth is even stronger than expected on the basis of BFKL resummation in the leading logarithmic approximation. The growth of the partonic cross section can be accommodated with an effective BFKL intercept of alphaBFKL(20 GeV)=1.65+/-0.07.
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Search for scalar top quark production in p&pmacr; collisions at sqrt

Physical review letters 84:23 (2000) 5273-5278

Authors:

S Tkaczyk, K Tollefson, A Tollestrup, H Toyoda, W Trischuk, de Troconiz JF, J Tseng, N Turini, F Ukegawa, J Valls, S Vejcik, G Velev, R Vidal, R Vilar, I Volobouev, D Vucinic, RG Wagner, RL Wagner, J Wahl, NB Wallace, AM Walsh, C Wang, CH Wang, MJ Wang, T Watanabe, D Waters

Abstract:

We have searched for direct production of scalar top quarks at the Collider Detector at Fermilab in 88 pb(-1) of p&pmacr; collisions at sqrt[s] = 1.8 TeV. We assume the scalar top quark decays into either a bottom quark and a chargino or a bottom quark, a lepton, and a scalar neutrino. The event signature for both decay scenarios is a lepton, missing transverse energy, and at least two b-quark jets. For a chargino mass of 90 GeV/c(2) and scalar neutrino masses of at least 40 GeV/c(2), we find no evidence for scalar top production and present upper limits on the production cross section in both decay scenarios.
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Measurement of azimuthal asymmetries in deep inelastic scattering

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 481:2-4 (2000) 199-212

Authors:

J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Stanek, R Yoshida, MCK Mattingly, G Abbiendi, F Anselmo, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, N Coppola, M Corradi, S de Pasquale, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, G Sartorelli, Y Zamora Garcia, A Zichichi, C Amelung, A Bornheim, I Brock, K Coböken, J Crittenden, R Deffner, H Hartmann, K Heinloth, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, E Paul, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, DS Bailey, O Barret, NH Brook, B Foster, GP Heath, HF Heath, JD McFall, D Piccioni, E Rodrigues, J Scott, RJ Tapper, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, W Liu, X Liu, B Mellado, S Paganis, S Sampson, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, K Piotrzkowski, MB Przybycień, P Stopa, L Zawiejski

Abstract:

The distribution of the azimuthal angle for the charged hadrons has been studied in the hadronic centre-of-mass system for neutral current deep inelastic positron-proton scattering with the ZEUS detector at HERA. Measurements of the dependence of the moments of this distribution on the transverse momenta of the charged hadrons are presented. Asymmetries that can be unambiguously attributed to perturbative QCD processes have been observed for the first time. (C) 2000 Elsevier Science B.V.
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Measurement of inclusive(D(s)(±)) photoproduction at HERA ZEUS collaboration

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 481:2-4 (2000) 213-227

Authors:

J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Stanek, R Yoshida, MCK Mattingly, G Abbiendi, F Anselmo, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, N Coppola, M Corradi, S de Pasquale, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, G Sartorelli, Y Zamora Garcia, A Zichichi, C Amelung, A Bornheim, I Brock, K Coböken, J Crittenden, R Deffner, H Hartmann, K Heinloth, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, E Paul, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, DS Bailey, O Barret, NH Brook, B Foster, GP Heath, HF Heath, JD McFall, D Piccioni, E Rodrigues, J Scott, RJ Tapper, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, W Liu, X Liu, B Mellado, S Paganis, S Sampson, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, K Piotrzkowski, MB Przybycień, P Stopa, L Zawiejski

Abstract:

The first measurement of inclusive D(s)(±) photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies 130 < W < 280GeV. The measured cross section for 3 < p (is perpendicular to)/(D(s)) < 12GeV and |η(D(s))| < 1.5 is σ(ep → D(s)X) = 3.79 ± 0.59(stat.) -0.46/+0.26 (syst.) ± 0.94(br.)nb, where the last error arises from the uncertainty in the D(s)(±) decay branching ratio. The measurements are compared with inclusive D*(±) photoproduction cross sections in the same kinematic region and with QCD calculations. The D(s)(±) cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level O(αα(s)/3) calculation that was tuned to describe the ZEUS D*(±) cross sections. The ratio of D(s)(±) to D*(±) cross sections is 0.41 ± 0.07 (stat.) -0.05/+0.03 (syst.) ± 0.10(br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be γ(s) = 0.27 ± 0.05 ± 0.07(br.). The cross-section ratio and γ(s) are in good agreement with those obtained in charm production in e+e- annihilation. (C) 2000 Elsevier Science B.V.
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