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Measurement of double parton scattering in p̄ p collisions at √s = 1.8 TeV

Physical Review Letters 79:4 (1997) 584-589

Authors:

F Abe, H Akimoto, A Akopian, MG Albrow, SR Amendolia, D Amidei, J Antos, S Aota, G Apollinari, T Asakawa, W Ashmanskas, M Atac, F Azfar, P Azzi-Bacchetta, N Bacchetta, W Badgett, S Bagdasarov, MW Bailey, J Bao, P de Barbaro, A Barbaro-Galtieri, VE Barnes, BA Barnett, M Barone, E Barzi, G Bauer, T Baumann, F Bedeschi, S Behrends, S Belforte, G Bellettini, J Bellinger, D Benjamin, J Benlloch, J Bensinger, D Benton, A Beretvas, JP Berge, J Berryhill, S Bertolucci, B Bevensee, A Bhatti, K Biery, M Binkley, D Bisello, RE Blair, C Blocker, A Bodek, W Bokhari, V Bolognesi, G Bolla, D Bortoletto, J Boudreau, L Breccia, C Bromberg, N Bruner, E Buckley-Geer, HS Budd, K Burkett, G Busetto, A Byon-Wagner, KL Byrum, J Cammerata, C Campagnari, M Campbell, A Caner, W Carithers, D Carlsmith, A Castro, D Cauz, Y Cen, F Cervelli, PS Chang, PT Chang, HY Chao, J Chapman, MT Cheng, G Chiarelli, T Chikamatsu, CN Chiou, L Christofek, S Cihangir, AG Clark, M Cobal, E Cocca, M Contreras, J Conway, J Cooper, M Cordelli, C Couyoumtzelis, D Crane, D Cronin-Hennessy, R Culbertson, T Daniels, F DeJongh, S Delchamps, S Dell'Agnello, M Dell'Orso, R Demina, L Demortier

Abstract:

A strong signal for double parton scattering (DP) is observed in a 16 pb-1 sample of p̄ p → γ + 3 jets + X data from the CDF experiment at the Fermilab Tevatron. The process-independent DP parameter, σeff, is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings at separate p̄ p collisions. The result, σeff = (14.5 ± 1.7-2.3+1.7) mb, represents a significant improvement over previous measurements. For the first time, the Feynman x dependence of the σeff parameter is investigated, and no dependence is seen.

Search for third generation leptoquarks in p̄ p collisions at √s = 1.8 TeV

Physical Review Letters 78:15 (1997) 2906-2911

Authors:

F Abe, H Akimoto, A Akopian, MG Albrow, SR Amendolia, D Amidei, J Antos, C Anway-Wiese, S Aota, G Apollinari, T Asakawa, W Ashmanskas, M Atac, F Azfar, P Azzi-Bacchetta, N Bacchetta, W Badgett, S Bagdasarov, MW Bailey, J Bao, P de Barbaro, A Barbaro-Galtieri, VE Barnes, BA Barnett, M Barone, E Barzi, G Bauer, T Baumann, F Bedeschi, S Behrends, S Belforte, G Bellettini, J Bellinger, D Benjamin, J Benlloch, J Bensinger, D Benton, A Beretvas, JP Berge, J Berryhill, S Bertolucci, B Bevensee, A Bhatti, K Biery, M Binkley, D Bisello, RE Blair, C Blocker, A Bodek, W Bokhari, V Bolognesi, G Bolla, D Bortoletto, J Boudreau, L Breccia, C Bromberg, N Bruner, E Buckley-Geer, HS Budd, K Burkett, G Busetto, A Byon-Wagner, KL Byrum, J Cammerata, C Campagnari, M Campbell, A Caner, W Carithers, D Carlsmith, A Castro, D Cauz, Y Cen, F Cervelli, PS Chang, PT Chang, HY Chao, J Chapman, MT Cheng, G Chiarelli, T Chikamatsu, CN Chiou, L Christofek, S Cihangir, AG Clark, M Cobal, E Cocca, M Contreras, J Conway, J Cooper, M Cordelli, C Couyoumtzelis, D Crane, D Cronin-Hennessy, R Culbertson, T Daniels, F DeJongh, S Delchamps, S Dell'Agnello, M Dell'Orso, R Demina

Abstract:

We present the results of a search for third generation leptoquark (LQ) pairs in 110 ± 8 pb-1 of pp collisions at √s = 1.8 TeV recorded by the Collider Detector at Fermilab. We assume third generation leptoquarks decay to a τ lepton and a b quark with branching ratio β. We observe one candidate event, consistent with standard model background expectations. We place upper limits on σ(p̄p → LQLQ) · β2 as a function of the leptoquark mass MLQ. We exclude at 95% confidence level scalar leptoquarks with MLQ < 99 GeV/c2, gauge vector leptoquarks with MLQ < 225 GeV/c2, and nongauge vector leptoquarks with MLQ < 170 GeV/c2 for β= 1.

Micro strip gas chambers overcoated with carbon, hydrogenated amorphous silicon, and glass films

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment Elsevier 400:2-3 (1997) 233-242

Authors:

MR Bishai, EKE Gerndt, IPJ Shipsey, AV Bagulya, VM Grishin, MA Negodaev, V Ligachev

Observation of Hadronic W Decays in t-tbar Events with the Collider Detector at Fermilab

ArXiv hep-ex/9711004 (1997)

Observation of Exclusive B Decays to Final States Containing a Charmed Baryon

Physical Review Letters American Physical Society (APS) 79:17 (1997) 3125-3129

Authors:

X Fu, B Nemati, SJ Richichi, WR Ross, P Skubic, M Wood, M Bishai, J Fast, E Gerndt, JW Hinson, T Miao, DH Miller, M Modesitt, EI Shibata, IPJ Shipsey, PN Wang, L Gibbons, SD Johnson, Y Kwon, S Roberts, EH Thorndike, CP Jessop, K Lingel, H Marsiske, ML Perl, SF Schaffner, R Wang, TE Coan, J Dominick, V Fadeyev, I Korolkov, M Lambrecht, S Sanghera, V Shelkov, R Stroynowski, I Volobouev, G Wei, M Artuso, A Efimov, M Gao, M Goldberg, D He, N Horwitz, S Kopp, GC Moneti, R Mountain, Y Mukhin, S Playfer, T Skwarnicki, S Stone, X Xing, J Bartelt, SE Csorna, V Jain, S Marka, A Freyberger, D Gibaut, K Kinoshita, P Pomianowski, S Schrenk, D Cinabro, B Barish, M Chadha, S Chan, G Eigen, JS Miller, C O'Grady, M Schmidtler, J Urheim, AJ Weinstein, F Würthwein, DM Asner, M Athanas, DW Bliss, WS Brower, G Masek, HP Paar, J Gronberg, CM Korte, R Kutschke, S Menary, RJ Morrison, S Nakanishi, HN Nelson, TK Nelson, C Qiao, JD Richman, D Roberts, A Ryd, H Tajima, MS Witherell, R Balest, K Cho, WT Ford, M Lohner, H Park, P Rankin, J Roy, JG Smith, JP Alexander, C Bebek, BE Berger, K Berkelman, K Bloom, DG Cassel, HA Cho, DM Coffman, DS Crowcroft, M Dickson, PS Drell, DJ Dumas, R Ehrlich, R Elia, P Gaidarev, B Gittelman, SW Gray, DL Hartill, BK Heltsley, CD Jones, SL Jones, J Kandaswamy, N Katayama, PC Kim, DL Kreinick, T Lee, Y Liu, GS Ludwig, J Masui, J Mevissen, NB Mistry, CR Ng, E Nordberg, JR Patterson, D Peterson, D Riley, A Soffer, C Ward, P Avery, C Prescott, S Yang, J Yelton, G Brandenburg, RA Briere, T Liu, M Saulnier, R Wilson, H Yamamoto, TE Browder, F Li, JL Rodriguez, T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, M Palmer, M Selen, JJ Thaler, KW Edwards, KW McLean, M Ogg, A Bellerive, DI Britton, R Janicek, DB MacFarlane, PM Patel, B Spaan, AJ Sadoff, R Ammar, P Baringer, A Bean, D Besson, D Coppage, N Copty, R Davis, N Hancock, S Kotov, I Kravchenko, N Kwak, Y Kubota, M Lattery, JK Nelson, S Patton, R Poling, T Riehle, V Savinov, MS Alam, IJ Kim, Z Ling, AH Mahmood, JJ O'Neill, H Severini, CR Sun, S Timm, F Wappler, JE Duboscq, R Fulton, D Fujino, KK Gan, K Honscheid, H Kagan, R Kass, J Lee, M Sung, A Undrus, C White, R Wanke, A Wolf, MM Zoeller