Search for the neutral current top quark decay t → Zc using the ratio of Z-boson+4 jets to W-boson+4 jets production

被引：4

作者：

Aaltonen, T. ^{[1
,2
]}

Adelman, J. ^{[17
]}

Akimoto, T. ^{[72
]}

Alvarez Gonzalez, B. ^{[15
]}

Amerio, S. ^{[8
,55
,57
]}

Amidei, D. ^{[45
]}

Anastassov, A. ^{[49
]}

Annovi, A. ^{[24
]}

Antos, J. ^{[18
,19
]}

Apollinari, G. ^{[22
]}

Apresyan, A. ^{[63
]}

Arisawa, T. ^{[74
]}

Artikov, A. ^{[20
]}

Ashmanskas, W. ^{[22
]}

Attal, A. ^{[6
]}

Aurisano, A. ^{[69
]}

Azfar, F. ^{[53
]}

Azzurri, P. ^{[58
,59
]}

Badgett, W. ^{[22
]}

Barbaro-Galtieri, A. ^{[36
]}

Barnes, V. E. ^{[63
]}

Barnett, B. A. ^{[29
]}

Bartsch, V. ^{[38
]}

Bauer, G. ^{[40
]}

Beauchemin, P. -H. ^{[41
,42
,43
,44
]}

Bedeschi, F. ^{[58
]}

Beecher, D. ^{[38
]}

Behari, S. ^{[29
]}

Bellettini, G. ^{[58
,59
]}

Bellinger, J. ^{[76
]}

Benjamin, D. ^{[21
]}

Beretvas, A. ^{[22
]}

Beringer, J. ^{[36
]}

Bhatti, A. ^{[65
]}

Binkley, M. ^{[22
]}

Bisello, D. ^{[54
,55
]}

Bizjak, I. ^{[38
]}

Blair, R. E. ^{[4
]}

Blocker, C. ^{[10
]}

Blumenfeld, B. ^{[29
]}

Bocci, A. ^{[21
]}

Bodek, A. ^{[64
]}

Boisvert, V. ^{[64
]}

Bolla, G. ^{[63
]}

Bortoletto, D. ^{[63
]}

Boudreau, J. ^{[62
]}

Boveia, A. ^{[14
]}

Brau, B. ^{[14
]}

Bridgeman, A. ^{[28
]}

Brigliadori, L. ^{[54
]}

机构：

[1] Univ Helsinki, Dept Phys, Div High Energy Phys, FIN-00014 Helsinki, Finland

[2] Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[4] Argonne Natl Lab, Argonne, IL 60439 USA

[5] Univ Athens, GR-15771 Athens, Greece

[6] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

[7] Baylor Univ, Waco, TX 76798 USA

[8] Ist Nazl Fis Nucl, I-40127 Bologna, Italy

[9] Univ Bologna, I-40127 Bologna, Italy

[10] Brandeis Univ, Waltham, MA 02254 USA

[11] Univ Calif Davis, Davis, CA 95616 USA

[12] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[13] Univ Calif San Diego, La Jolla, CA 92093 USA

[14] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

[15] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain

[16] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[17] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[18] Comenius Univ, Bratislava 84248, Slovakia

[19] Inst Expt Phys, Kosice 04001, Slovakia

[20] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[21] Duke Univ, Durham, NC 27708 USA

[22] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[23] Univ Florida, Gainesville, FL 32611 USA

[24] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[25] Univ Geneva, CH-1211 Geneva 4, Switzerland

[26] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

[27] Harvard Univ, Cambridge, MA 02138 USA

[28] Univ Illinois, Urbana, IL 61801 USA

[29] Johns Hopkins Univ, Baltimore, MD 21218 USA

[30] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[31] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea

[32] Seoul Natl Univ, Seoul 151742, South Korea

[33] Sungkyunkwan Univ, Suwon 440746, South Korea

[34] Korea Inst Sci & Technol Informat, Taejon 305806, South Korea

[35] Chonnam Natl Univ, Kwangju 500757, South Korea

[36] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[37] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England

[38] UCL, London WC1E 6BT, England

[39] CIEMAT, E-28040 Madrid, Spain

[40] MIT, Cambridge, MA 02139 USA

[41] McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada

[42] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada

[43] Univ Toronto, Toronto, ON M5S 1A7, Canada

[44] TRIUMF, Vancouver, BC V6T 2A3, Canada

[45] Univ Michigan, Ann Arbor, MI 48109 USA

[46] Michigan State Univ, E Lansing, MI 48824 USA

[47] Inst Theoret & Expt Phys, Moscow 117259, Russia

[48] Univ New Mexico, Albuquerque, NM 87131 USA

[49] Northwestern Univ, Evanston, IL 60208 USA

[50] Ohio State Univ, Columbus, OH 43210 USA

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 05期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 俄罗斯基础研究基金会; 瑞士国家科学基金会; 芬兰科学院; 英国科学技术设施理事会;

关键词：

P(P)OVER-BAR COLLISIONS; PBARP COLLISIONS; CROSS-SECTION; ROOT-S; CDF; NEUTRINOS; UPGRADE; NUMBER; CALORIMETER; PERFORMANCE;

D O I：

10.1103/PhysRevD.80.052001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have used the Collider Detector at Fermilab (CDF-II) to search for the flavor-changing neutral-current (FCNC) top-quark decay t -> Zc using a technique employing ratios of W and Z production, measured in p (p) over bar data corresponding to an integrated luminosity of 1.52 fb(-1). The analysis uses a comparison of two decay chains, p (p) over bar -> t (t) over bar -> WbWb -> l nu bjjb and p (p) over bar -> t (t) over bar -> ZcWb -> llcjjb, to cancel systematic uncertainties in acceptance, efficiency, and luminosity. We validate the modeling of acceptance and efficiency for lepton identification over the multiyear data set using another ratio of W and Z production, in this case the observed ratio of inclusive production of W to Z bosons. To improve the discrimination against standard model backgrounds to top-quark decays, we calculate the top-quark mass for each event with two leptons and four jets assuming it is a t (t) over bar event with one of the top quarks decaying to Zc. For additional background discrimination we require at least one jet to be identified as originating from a b quark. No significant signal is found and we set an upper limit on the FCNC branching ratio Br(t -> Zc) using a likelihood constructed from the llcjjb top-quark mass distribution and the number of l nu bjjb events. Limits are set as a function of the helicity of the Z boson produced in the FCNC decay. For 100% longitudinally-polarized Z bosons we find limits of 8.3% and 9.3% (95% C. L.) depending on the assumptions regarding the theoretical top-quark pair production cross section.

引用

页数：24

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