Professor Daniela Bortoletto: Publications

Search for first generation leptoquark pair production in p®p collisions at s) = 1.8Tev

Physical Review Letters 79:22 (1997) 4327-4332

Authors:

F Abe, H Akimoto, A Akopian, MG Albrow, A Amadon, SR Amendolia, D Amidei, J Antos, S Aota, G Apollinari, T Arisawa, 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, E Barzi, B 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, S Bettelli, B Bevensee, A Bhatti, K Biery, M Binkley, D Bisello, RE Blair, C Blocker, S Blusk, A Bodek, W Bokhari, G Bolla, V Bolognesi, Y Bonushkin, D Bortoletto, J Boudreau, L Breccia, C Bromberg, N Bruner, E Buckley-Geer, HS Budd, K Burkett, G Busetto, A Byon-Wagner, KL Byrum, C Campagnari, M Campbell, A Caner, W Carithers, D Carlsmith, J Cassada, A Castro, D Cauz, Y Cen, A Cerri, F Cervelli, PS Chang, PT Chang, HY Chao, J Chapman, MT Cheng, M Chertok, 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

Abstract:

We present the results of a search for first generation scalar leptoquarks pairs (S1��®1) in 110 ± 7 pb⁻¹ of data collected by the Collider Detector at Fermilab. We assume both leptoquarks decay to an electron and a quark. Three candidate events, with masses below 140 GeV/c² and consistent with background expectations, are observed. We obtain a 95% confidence level upper limit on the production cross section as a function of the leptoquark mass. Using a next-to-leading order calculation of S1��®1 production, we exclude scalar leptoquarks with mass less than 213GeV/c² at 95% C.L. for a branching ratio into eq equal to 1. © 1997 American Physical Society.

Search for gluinos and squarks at the Fermilab Tevatron collider

Physical Review D Particles Fields Gravitation and Cosmology 56:3 (1997) R1357-R1362

Authors:

RE Blair, KL Byrum, D Crane, SE Kuhlmann, T LeCompte, L Nodulman, J Proudfoot, RG Wagner, AB Wicklund, V Bolognesi, L Breccia, M Deninno, I Fiori, F Rimondi, S Zucchelli, S Behrends, J Bensinger, C Blocker, L Kirsch, JI Lamoureux, J Hauser, F Keyvan, M Lindgren, T Muller, D Neuberger, J Berryhill, M Contreras, R Culbertson, H Frisch, C Grosso-Pilcher, M Hohlmann, S Kopp, J Romano, D Saltzberg, M Shochet, G Sullivan, D Toback, J Wahl, J Wang, P Wilson, D Cronin-Hennessy, JR Dittmann, AT Goshaw, SA Hauger, W Kowald, SH Oh, TJ Phillips, WJ Robertson, C Wang, C Wei, M Yin, MG Albrow, M Atac, A Beretvas, JP Berge, K Biery, M Binkley, E Buckley-Geer, A Byon-Wagner, C Campagnari, S Cihangir, J Cooper, F DeJongh, S Delchamps, R Demina, PF Derwent, JE Elias, B Flaugher, GW Foster, J Freeman, S Geer, SR Hahn, RM Harris, J Hylen, J Incandela, H Jensen, U Joshi, RD Kennedy, R Kephart, H Keutelian, DH Kim, W Koska, E Kovacs, J Kroll, S Lammel, JD Lewis, P Limon, P Lukens, K Maeshima, JP Marriner, T Miao, A Mukherjee, C Nelson, C Newman-Holmes, S Park, J Patrick, KT Pitts, R Plunkett, P Schlabach, EE Schmidt

Abstract:

We report on a search for supersymmetric squark and gluino particles in a data sample of 19 [Formula presented] of [Formula presented] collisions at [Formula presented] TeV recorded by the Collider Detector at Fermilab. We searched for events containing jets plus appreciable missing transverse energy [Formula presented] This signature is indicative of pair production and subsequent decay of squarks and/or gluinos. After all cuts, there are [Formula presented] events with [Formula presented] GeV and three jets, and [Formula presented] events with [Formula presented] GeV and four jets. These numbers of events are consistent with estimates of standard model processes plus detector-induced background sources. The analysis yields lower limits on gluino and squark masses, based on the predictions from the mnimal supersymmetric extension of the standard model. At the [Formula presented] confidence level, we find gluino and squark mass limits up to 216 [Formula presented] assuming equal gluino and squark masses, and gluino mass limits up to [Formula presented] [Formula presented] independent of squark mass. © 1997 The American Physical Society.

Search for new gauge bosons decaying into dileptons in p-p collisions at s) = 1.8TeV

Physical Review Letters 79:12 (1997) 2192-2197

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:

We have searched for heavy neutral gauge bosons (Z') in dielectron and dimuon decay modes using 110pb^-1 of p^-p collisions at √s = 1.8TeV collected with the Collider Detector at Fermilab. We present a limit on the production cross section times branching ratio of a Z' mass. For mass MZ' > 600 GeV/c², the upper limit is 40 fb at 95% confidence level. We set the lower mass limits of 690, 590, 620, 595, 565, 630, and 600 GeV/c² for Z'SM, ZΨ, Zψ, Zχ, ZI, ZLR, and ZALRM, respectively. © 1997 The American Physical Society.

Search for new particles decaying into b¯b and produced in association with w bosons decaying into eν or μν at the fermilab tevatron

Physical Review Letters 79:20 (1997) 3819-3824

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, S Bettelli, B Bevensee, A Bhatti, K Biery, M Binkley, D Bisello, RE Blair, C Blocker, A Bodek, W Bokhari, G Bolla, V Bolognesi, 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 De Jongh, S Delchamps, S Dell-Agnello, M Dell’orso, R Demina

Abstract:

We search for new particles that decay into b¯b and are produced with W bosons in p¯p collisions at √s = 1.8TeV. The search uses 109 ± 7pb^-1 accumulated by the CDF experiment at Fermilab. We select events with an eν or μν, and two jets, one of them b tagged. The number of events and the two-jet mass distribution are consistent with expectations. Using W+Higgs production as a model for the acceptance, we set an upper limit on the production cross section times branching ratio for the new particle ranging from 14 to 19 pb (95% C.L.) as the particle mass varies from 70 to 120GeV/c². © 1997 The American Physical Society.

Search for new particles decaying to dijets at CDF

Physical Review D - Particles, Fields, Gravitation and Cosmology 55:9 (1997) R5263-R5268

Authors:

Abstract:

We have used 106 pb[Formula presented] of data collected with the Collider Detector at Fermilab to search for new particles decaying to dijets. We exclude at the 95% confidence level models containing the following new particles: axigluons and flavor universal colorons with a mass between 200 and 980 GeV/[Formula presented], excited quarks with a mass between 80 and 570 GeV/[Formula presented] and between 580 and 760 GeV/[Formula presented], color octet techni-[Formula presented]’s with a mass between 260 and 480 GeV/[Formula presented], [Formula presented] bosons with a mass between 300 and 420 GeV/[Formula presented], and [Formula presented] diquarks with a mass between 290 and 420 GeV/[Formula presented]. © 1997 The American Physical Society.

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