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1. Search for single-top-quark production in p(p)over-bar collisions at root s=1.8 TeV

Author

Acosta, D, Affolder, T, Akimoto, H, Albrow, MG, Amaral, P, Ambrose, D, Amidei, D, Anikeev, K, Antos, J, Apollinari, G, Arisawa, T, Artikov, A, Asakawa, T, Ashmanskas, W, Azfar, F, Azzi-Bacchetta, P, Bacchetta, N, Bachacou, H, Bailey, S, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Baroiant, S, and Barone, M

Published
2016

9. STUDY OF T(T)OVER-BAR PRODUCTION IN P(P)OVER-BAR COLLISIONS USING TOTAL TRANSVERSE ENERGY

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, M, Amendolia, S, Amidei, D, Antos, J, Anwaywiese, C, Aota, S, Apollinari, G, Asakawa, T, Ashmanskas, W, Atac, M, Auchincloss, P, Azfar, F, Azzibacchetta, P, Bacchetta, N, Badgett, W, Bagdasarov, S, Bailey, M, Bao, J, Debarbaro, P, Barbarogaltieri, A, Barnes, V, and Barnett, B

Abstract

We analyze a sample of W+jet events collected with the Collider Detector at Fermilab (CDF) in pp» collisions at s=1.8 TeV to study tt» production. We employ a simple kinematical variable H, defined as the scalar sum of the transverse energies of the lepton, neutrino, and jets. For events with a W boson and four or more jets, the shape of the H distribution deviates by 3.8 standard deviations from that expected from known backgrounds to tt» production. However, this distribution agrees well with a linear combination of background and tt» events, the agreement being best for a top mass of 180 GeV/c2. © 1995 The American Physical Society.

Published
2016

12. Observation of orbitally excited B mesons in p(p)over-bar collisions at root s=1.8 TeV

Author

Affolder, T, Akimoto, H, Akopian, A, Albrow, MG, Amaral, P, Amendolia, SR, Amidei, D, Anikeev, K, Antos, J, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azfar, F, Azzi-Bacchetta, P, Bacchetta, N, Bailey, M, Bailey, S, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, and Bauer, G

Published
2016

18. OBSERVATION OF TOP-QUARK PRODUCTION IN (P)OVER-BAR-P COLLISIONS WITH THE COLLIDER DETECTOR AT FERMILAB

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, M, Amendolia, S, Amidei, D, Antos, J, Anwaywiese, C, Aota, S, Apollinari, G, Asakawa, T, Ashmanskas, W, Atac, M, Auchincloss, P, Azfar, F, Azzibacchetta, P, Bacchetta, N, Badgett, W, Bagdasarov, S, Bailey, M, Bao, J, Debarbaro, P, Barbarogaltieri, A, Barnes, V, and Barnett, B

Abstract

We establish the existence of the top quark using a 67 pb-1 data sample of p̄p collisions at s=1.8 TeV collected with the Collider Detector at Fermilab (CDF). Employing techniques similar to those we previously published, we observe a signal consistent with tt̄ decay to WWbb̄, but inconsistent with the background prediction by 4.8σ. Additional evidence for the top quark is provided by a peak in the reconstructed mass distribution. We measure the top quark mass to be 176±8(stat)±10(syst) GeV/c2, and the tt̄ production cross section to be 6.8-2.4+3.6 pb. © 1995 The American Physical Society.

Published
2016

22. Measurement of the W boson mass with the Collider Detector at Fermilab

Author

Affolder, T, Akimoto, H, Akopian, A, Albrow, MG, Amaral, P, Amendolia, SR, Amidei, D, Anikeev, K, Antos, J, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azfar, F, Azzi-Bacchetta, P, Bacchetta, N, Bailey, M, Bailey, S, De Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, and Bauer, G

Abstract

We present a measurement of the W boson mass using data collected with the CDF detector during the 1994-1995 collider run at the Fermilab Tevatron. A fit to the transverse mass spectrum of a sample of 30115 W → ev events recorded in an integrated luminosity of 84 pb-1 gives a mass MW=80.473±0.065(stat) ±0.092(syst) GeV/c2. A fit to the transverse mass spectrum of a sample of 14740 W → μν events from 80 pb-1 gives a mass MW=80.465±0.100(stat)±0.103(syst) GeV/c2. The dominant contributions to the systematic uncertainties are the uncertainties in the electron energy scale and the muon momentum scale, 0.075 GeV/c2 and 0.085 GeV/c2, respectively. The combined value for the electron and muon channel is MW=80.470±0.089 GeV/c2. When combined with previously published CDF measurements, we obtain MW=80.433±0.079GeV/c2. ©2001 The American Physical Society.

Published
2016

23. Ratios of bottom meson branching fractions involving J/psi mesons and determination of b quark fragmentation fractions

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, MG, Amendolia, SR, Amidei, D, Antos, J, AnwayWiese, C, Aota, S, Apollinari, G, Asakawa, T, Ashmanskas, W, Atac, M, Azfar, F, AzziBacchetta, P, Bacchetta, N, Badgett, W, Bagdasarov, S, Bailey, M, Bao, J, deBarbaro, P, BarbaroGaltieri, A, Barnes, V, Barnett, B, and Barzi, E

Abstract

We report a measurement of the ratios of the decay rates of the B+, B0, and Bs 0 mesons into exclusive final states containing a J/ψ meson. The final states were selected from 19.6 pb-1 of pp̄ collisions recorded by the Collider Detector at Fermilab. These data are interpreted to determine the b quark fragmentation fractions fu, fd, and fs. We also determine the branching fractions for the decay modes B+ → J/ψK+, B+ → J/ψK*(892)+, B0 → J/ψK0, B0 → J/ψK*(892)0, and Bs 0 → J/ψφ(1020). We discuss the implications of these measurements to B meson decay models. © 1996 The American Physical Society.

Published
2016

28. Search for new gauge bosons decaying into dileptons in (p)over-bar-p collisions at root s=1.8 TeV

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, MG, Amendolia, SR, Amidei, D, Antos, J, Aota, S, Apollinari, G, Asakawa, T, Ashmanskas, W, Atac, M, Azfar, F, AzziBacchetta, P, Bacchetta, N, Badgett, W, Bagdasarov, B, Bailey, M, Bao, J, deBarbaro, P, BarbaroGaltieri, A, Barnes, V, Barnett, B, Barone, M, and Barzi, E

Abstract

We have searched for heavy neutral gauge bosons (Z′) in dielectron and dimuon decay modes using 110 pb-1 of p̄ p collisions at √s = 1.8 TeV collected with the Collider Detector at Fermilab. We present a limit on the production cross section times branching ratio of a Z′ boson decaying into dileptons as a function of 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; Zη Zχ, ZI, ZLR, and ZALRM, respectively.

Published
2016

32. Kinematics of t(t)over-bar events at CDF

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, MG, Amadon, A, Amendolia, SR, Amidei, D, Antos, J, Aota, S, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azzi-Bacchetta, P, Bacchetta, N, Bagdasarov, S, Bailey, M, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, Bauer, G, and Baumann, T

Published
2016

37. Upsilon production and polarization in p(p)over-bar collisions at root s=1.8 TeV

Author

Acosta, D, Affolder, T, Akimoto, H, Albrow, MG, Amaral, P, Ambrose, D, Amidei, D, Anikeev, K, Antos, J, Apollinari, G, Arisawa, T, Artikov, A, Asakawa, T, Ashmanskas, W, Azfar, F, Azzi-Bacchetta, P, Bacchetta, N, Bachacou, H, Bailey, S, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Baroiant, S, and Barone, M

Published
2016

40. Measurement of sin 2 beta from B -> J/psi K-S(0) with the CDF detector

Author

Affolder, T, Akimoto, H, Akopian, A, Albrow, MG, Amaral, P, Amendolia, SR, Amidei, D, Antos, J, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azzi-Bacchetta, P, Bacchetta, N, Bailey, M, Bailey, S, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, Bauer, G, Bedeschi, F, and Belforte, S

Published
2016

41. Measurement of the B-S(0) meson lifetime using semileptonic decays

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, MG, Amadon, A, Amendolia, SR, Amidei, D, Antos, J, Aota, S, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azzi-Bacchetta, P, Bacchetta, N, Bagdasarov, S, Bailey, M, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, Bauer, G, and Baumann, T

Published
2016

42. Search for flavor-changing neutral current B meson decays in p(p)over-bar collisions at root s=1.8 TeV

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, MG, Amendolia, SR, Amidei, D, Antos, J, AnwayWise, C, Aota, S, Apollinari, G, Asakawa, T, Ashmanskas, W, Atac, M, Azfar, F, AzziGaltieri, P, Bacchetta, N, Badgett, W, Bagdasarov, S, Bailey, M, Bao, J, deBarbaro, P, BarbaroGaltieri, A, Barnes, V, Barnett, B, and Barzi, E

Abstract

We report on a search for the flavor-changing neutral current decays B d,s 0 → μ+μ-, B+ → μ+μ-K+ and B0 → μ+μ-K*0 using data from pp̄ collisions at √s = 1.8 TeV, collected with the Collider Detector at Fermilab during the 1992-1993 running period. We find no indication of such decays, and we set the following 90% confidence level upper limits on branching ratios: B(B0 → μ+μ-) < 1.6 × 10-6, B(BS 0 → μ+μ-) < 8.4 × 10-6, B(B+ → μ+μ-K+) < 1.0 × 10-5, and B(B0 → μ+μ-K*0) < 2.5 × 10-5.

Published
2016

44. Events with a rapidity gap between jets in (p)over-bar-p collisions at root s=630 GeV

Author

Abe, F, Akimoto, H, Akopian, A, Albrow, MG, Amadon, A, Amendolia, SR, Amidei, D, Antos, J, Aota, S, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azzi-Bacchetta, P, Bacchetta, N, Bagdasarov, S, Bailey, M, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, Bauer, G, and Baumann, T

Published
2016

45. Search for scalar top quark production in p)(p)over-bar collisions at root s=1.8 TeV

Author

Affolder, T, Akimoto, H, Akopian, A, Albrow, MG, Amaral, P, Amendolia, SR, Amidei, D, Anikeev, K, Antos, J, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azfar, F, Azzi-Bacchetta, P, Bacchetta, N, Bailey, M, Bailey, S, de Barbaro, P, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Barone, M, and Bauer, G

Published
2016

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