Evidence for a mass dependent forward-backward asymmetry in top quark pair production

被引:288
作者
Aaltonen, T. [1 ,2 ]
Gonzalez, B. Alvarez [12 ]
Amerio, S.
Amidei, D. [43 ]
Anastassov, A. [47 ]
Annovi, A. [19 ,21 ]
Antos, J. [15 ,16 ]
Apollinari, G. [19 ]
Appel, J. A. [19 ]
Apresyan, A. [61 ]
Arisawa, T. [73 ]
Artikov, A. [17 ]
Asaadi, J. [66 ]
Ashmanskas, W. [19 ]
Auerbach, B. [76 ]
Aurisano, A. [66 ]
Azfar, F. [51 ]
Badgett, W. [19 ]
Barbaro-Galtieri, A. [34 ]
Barnes, V. E. [61 ]
Barnett, B. A. [26 ]
Barria, P. [56 ,58 ]
Bartos, P. [15 ,16 ]
Bauce, M. [52 ,53 ]
Bauer, G. [38 ]
Bedeschi, F. [52 ,53 ]
Beecher, D. [36 ]
Behari, S. [26 ]
Bellettini, G. [56 ,57 ]
Bellinger, J. [75 ]
Benjamin, D. [18 ]
Beretvas, A. [19 ]
Bhatti, A. [63 ]
Binkley, M. [19 ]
Bisello, D. [52 ,53 ]
Bizjak, I. [36 ]
Bland, K. R. [7 ]
Blumenfeld, B. [26 ]
Bocci, A. [18 ]
Bodek, A. [62 ]
Bortoletto, D. [61 ]
Boudreau, J. [60 ]
Boveia, A. [14 ]
Brau, B. [19 ]
Brigliadori, L. [8 ,9 ]
Brisuda, A. [15 ,16 ]
Bromberg, C. [44 ]
Brucken, E. [1 ,2 ]
Bucciantonio, M. [56 ,57 ]
Budagov, J. [17 ]
机构
[1] Univ Helsinki, Div High Energy Phys, Dept 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 Bellaterra, Barcelona, Spain
[7] Baylor Univ, Waco, TX 76798 USA
[8] Ist Nazl Fis Nucl Bologna, I-40127 Bologna, Italy
[9] Univ Bologna, I-40127 Bologna, Italy
[10] Univ Calif Davis, Davis, CA 95616 USA
[11] Univ Calif Los Angeles, Los Angeles, CA 90024 USA
[12] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain
[13] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
[14] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[15] Slovak Acad Sci, Inst Expt Phys, Kosice 04001, Slovakia
[16] Comenius Univ, Bratislava 84248, Slovakia
[17] Joint Inst Nucl Res, RU-141980 Dubna, Russia
[18] Duke Univ, Durham, NC 27708 USA
[19] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
[20] Univ Florida, Gainesville, FL 32611 USA
[21] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[22] Univ Geneva, CH-1211 Geneva 4, Switzerland
[23] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland
[24] Harvard Univ, Cambridge, MA 02138 USA
[25] Univ Illinois, Urbana, IL 61801 USA
[26] Johns Hopkins Univ, Baltimore, MD 21218 USA
[27] Karlsruhe Inst Technol, Inst Expt Kernphys, D-76131 Karlsruhe, Germany
[28] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea
[29] Seoul Natl Univ, Seoul 151742, South Korea
[30] Sungkyunkwan Univ, Suwon 440746, South Korea
[31] Korea Inst Sci & Technol Informat, Taejon 305806, South Korea
[32] Chonnam Natl Univ, Kwangju 500757, South Korea
[33] Chonbuk Natl Univ, Jeonju 561756, South Korea
[34] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[35] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England
[36] UCL, London WC1E 6BT, England
[37] Ctr Invest Energet Medioambient & Tecnol, E-28040 Madrid, Spain
[38] MIT, Cambridge, MA 02139 USA
[39] McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada
[40] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada
[41] Univ Toronto, Toronto, ON M5S 1A7, Canada
[42] TRIUMF, Vancouver, BC V6T 2A3, Canada
[43] Univ Michigan, Ann Arbor, MI 48109 USA
[44] Michigan State Univ, E Lansing, MI 48824 USA
[45] ITEP, Moscow 117259, Russia
[46] Univ New Mexico, Albuquerque, NM 87131 USA
[47] Northwestern Univ, Evanston, IL 60208 USA
[48] Ohio State Univ, Columbus, OH 43210 USA
[49] Okayama Univ, Okayama 7008530, Japan
[50] Osaka City Univ, Osaka 588, Japan
来源
PHYSICAL REVIEW D | 2011年 / 83卷 / 11期
基金
俄罗斯基础研究基金会; 新加坡国家研究基金会; 加拿大自然科学与工程研究理事会; 英国科学技术设施理事会; 美国国家科学基金会; 瑞士国家科学基金会; 芬兰科学院;
关键词
P(P)OVER-BAR COLLISIONS; HEAVY QUARKS; T(T)OVER-BAR; SEARCH;
D O I
10.1103/PhysRevD.83.112003
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new measurement of the inclusive forward-backward t (t) over bar production asymmetry and its rapidity and mass dependence. The measurements are performed with data corresponding to an integrated luminosity of 5.3 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV, recorded with the CDF-II Detector at the Fermilab Tevatron. Significant inclusive asymmetries are observed in both the laboratory frame and the t (t) over bar rest frame, and in both cases are found to be consistent with CP conservation under interchange of t and (t) over bar. In the t (t) over bar rest frame, the asymmetry is observed to increase with the t (t) over bar rapidity difference, Delta y, and with the invariant mass M-t (t) over bar of the t (t) over bar system. Fully corrected parton-level asymmetries are derived in two regions of each variable, and the asymmetry is found to be most significant at large Delta y and M-t (t) over bar. For M-t (t) over bar >= 450 GeV/c(2), the parton-level asymmetry in the t (t) over bar rest frame is A(t (t) over bar) = 0.475 +/- 0.114 compared to a next-to-leading order QCD prediction of 0.088 +/- 0.013.
引用
收藏
页数:23
相关论文
共 49 条
[1]   Forward-Backward Asymmetry in Top-Quark Production in p(p)over-bar Collisions at √s=1.96 TeV [J].
Aaltonen, T. ;
Adelman, J. ;
Akimoto, T. ;
Albrow, M. G. ;
Gonzalez, B. Alvarez ;
Amerio, S. ;
Amidei, D. ;
Anastassov, A. ;
Annovi, A. ;
Antos, J. ;
Apollinari, G. ;
Apresyan, A. ;
Arisawa, T. ;
Artikov, A. ;
Ashmanskas, W. ;
Attal, A. ;
Aurisano, A. ;
Azfar, F. ;
Azzurri, P. ;
Badgett, W. ;
Barbaro-Galtieri, A. ;
Barnes, V. E. ;
Barnett, B. A. ;
Bartsch, V. ;
Bauer, G. ;
Beauchemin, P. -H. ;
Bedeschi, F. ;
Bednar, P. ;
Beecher, D. ;
Behari, S. ;
Bellettini, G. ;
Bellinger, J. ;
Benjamin, D. ;
Beretvas, A. ;
Beringer, J. ;
Bhatti, A. ;
Binkley, M. ;
Bisello, D. ;
Bizjak, I. ;
Blair, R. E. ;
Blocker, C. ;
Blumenfeld, B. ;
Bocci, A. ;
Bodek, A. ;
Boisvert, V. ;
Bolla, G. ;
Bortoletto, D. ;
Boudreau, J. ;
Boveia, A. ;
Brau, B. .
PHYSICAL REVIEW LETTERS, 2008, 101 (20)
[2]   Measurement of the Ratio σt(t)over-bar/σZ/γ*→ll and Precise Extraction of the t(t)over-bar Cross Section [J].
Aaltonen, T. ;
Adelman, J. ;
Alvarez Gonzalez, B. ;
Amerio, S. ;
Amidei, D. ;
Anastassov, A. ;
Annovi, A. ;
Antos, J. ;
Apollinari, G. ;
Apresyan, A. ;
Arisawa, T. ;
Artikov, A. ;
Asaadi, J. ;
Ashmanskas, W. ;
Attal, A. ;
Aurisano, A. ;
Azfar, F. ;
Badgett, W. ;
Barbaro-Galtieri, A. ;
Barnes, V. E. ;
Barnett, B. A. ;
Barria, P. ;
Bartos, P. ;
Bauer, G. ;
Beauchemin, P. -H. ;
Bedeschi, F. ;
Beecher, D. ;
Behari, S. ;
Bellettini, G. ;
Bellinger, J. ;
Benjamin, D. ;
Beretvas, A. ;
Bhatti, A. ;
Binkley, M. ;
Bisello, D. ;
Bizjak, I. ;
Blair, R. E. ;
Blocker, C. ;
Blumenfeld, B. ;
Bocci, A. ;
Bodek, A. ;
Boisvert, V. ;
Bortoletto, D. ;
Boudreau, J. ;
Boveia, A. ;
Brau, B. ;
Bridgeman, A. ;
Brigliadori, L. ;
Bromberg, C. ;
Brubaker, E. .
PHYSICAL REVIEW LETTERS, 2010, 105 (01)
[3]   Search for new color-octet vector particle decaying to t(t)over-bar in p(p)over-bar collisions at √s=1.96 TeV [J].
Aaltonen, T. ;
Adelman, J. ;
Gonzalez, B. Alvarez ;
Amerio, S. ;
Amidei, D. ;
Anastassov, A. ;
Annovi, A. ;
Antos, J. ;
Apollinari, G. ;
Apresyan, A. ;
Arisawa, T. ;
Artikov, A. ;
Asaadi, J. ;
Ashmanskas, W. ;
Attal, A. ;
Aurisano, A. ;
Azfar, F. ;
Badgett, W. ;
Barbaro-Galtieri, A. ;
Barnes, V. E. ;
Barnett, B. A. ;
Barria, P. ;
Bartos, P. ;
Bauer, G. ;
Beauchemin, P. -H. ;
Bedeschi, F. ;
Beecher, D. ;
Behari, S. ;
Bellettini, G. ;
Bellinger, J. ;
Benjamin, D. ;
Beretvas, A. ;
Bhatti, A. ;
Binkley, M. ;
Bisello, D. ;
Bizjak, I. ;
Blair, R. E. ;
Blocker, C. ;
Blumenfeld, B. ;
Bocci, A. ;
Bodek, A. ;
Boisvert, V. ;
Bortoletto, D. ;
Boudreau, J. ;
Boveia, A. ;
Brau, B. ;
Bridgeman, A. ;
Brigliadori, L. ;
Bromberg, C. ;
Brubaker, E. .
PHYSICS LETTERS B, 2010, 691 (04) :183-190
[4]   First Measurement of the t(t) over bar Differential Cross Section dσ/dMt(t) over bar in p(p) over bar Collisions at √s=1.96 TeV [J].
Aaltonen, T. ;
Adelman, J. ;
Akimoto, T. ;
Alvarez Gonzalez, B. ;
Amerio, S. ;
Amidei, D. ;
Anastassov, A. ;
Annovi, A. ;
Antos, J. ;
Apollinari, G. ;
Apresyan, A. ;
Arisawa, T. ;
Artikov, A. ;
Ashmanskas, W. ;
Attal, A. ;
Aurisano, A. ;
Azfar, F. ;
Azzurri, P. ;
Badgett, W. ;
Barbaro-Galtieri, A. ;
Barnes, V. E. ;
Barnett, B. A. ;
Bartsch, V. ;
Bauer, G. ;
Beauchemin, P. -H. ;
Bedeschi, F. ;
Beecher, D. ;
Behari, S. ;
Bellettini, G. ;
Bellinger, J. ;
Benjamin, D. ;
Beretvas, A. ;
Beringer, J. ;
Bhatti, A. ;
Binkley, M. ;
Bisello, D. ;
Bizjak, I. ;
Blair, R. E. ;
Blocker, C. ;
Blumenfeld, B. ;
Bocci, A. ;
Bodek, A. ;
Boisvert, V. ;
Bolla, G. ;
Bortoletto, D. ;
Boudreau, J. ;
Boveia, A. ;
Brau, B. ;
Bridgeman, A. ;
Brigliadori, L. .
PHYSICAL REVIEW LETTERS, 2009, 102 (22)
[5]   Search for t(t)over-bar resonances in the lepton plus jets final state in p(p)over-bar collisions at √s=1.96 TeV [J].
Abazov, V. M. ;
Abbott, B. ;
Abolins, M. ;
Acharya, B. S. ;
Adams, M. ;
Adams, T. ;
Aguilo, E. ;
Ahn, S. H. ;
Ahsan, M. ;
Alexeev, G. D. ;
Alkhazov, G. ;
Alton, A. ;
Alverson, G. ;
Alves, G. A. ;
Anastasoaie, M. ;
Ancu, L. S. ;
Andeen, T. ;
Anderson, S. ;
Andrieu, B. ;
Anzelc, M. S. ;
Aoki, M. ;
Arnoud, Y. ;
Arov, M. ;
Arthaud, M. ;
Askew, A. ;
Asman, B. ;
Jesus, A. C. S. Assis ;
Atramentov, O. ;
Avila, C. ;
Badaud, F. ;
Baden, A. ;
Bagby, L. ;
Baldin, B. ;
Bandurin, D. V. ;
Banerjee, P. ;
Banerjee, S. ;
Barberis, E. ;
Barfuss, A. -F. ;
Bargassa, P. ;
Baringer, P. ;
Barreto, J. ;
Bartlett, J. F. ;
Bassler, U. ;
Bauer, D. ;
Beale, S. ;
Bean, A. ;
Begalli, M. ;
Begel, M. ;
Belanger-Champagne, C. ;
Bellantoni, L. .
PHYSICS LETTERS B, 2008, 668 (02) :98-104
[6]   Measurement of the forward-backward charge asymmetry in top-quark pair production [J].
Abazov, V. M. ;
Abbott, B. ;
Abolins, M. ;
Acharya, B. S. ;
Adams, M. ;
Adams, T. ;
Aguilo, E. ;
Ahn, S. H. ;
Ahsan, M. ;
Alexeev, G. D. ;
Alkhazov, G. ;
Alton, A. ;
Alverson, G. ;
Alves, G. A. ;
Anastasoaie, M. ;
Ancu, L. S. ;
Andeen, T. ;
Anderson, S. ;
Andrieu, B. ;
Anzelc, M. S. ;
Arnoud, Y. ;
Arov, M. ;
Arthaud, M. ;
Askew, A. ;
Asman, B. ;
Jesus, A. C. S. Assis ;
Atramentov, O. ;
Autermann, C. ;
Avila, C. ;
Ay, C. ;
Badaud, F. ;
Baden, A. ;
Bagby, L. ;
Baldin, B. ;
Bandurin, D. V. ;
Banerjee, S. ;
Banerjee, P. ;
Barberis, E. ;
Barfuss, A. -F. ;
Bargassa, P. ;
Baringer, P. ;
Barreto, J. ;
Bartlett, J. F. ;
Bassler, U. ;
Bauer, D. ;
Beale, S. ;
Bean, A. ;
Begalli, M. ;
Begel, M. ;
Belanger-Champagne, C. .
PHYSICAL REVIEW LETTERS, 2008, 100 (14)
[7]   Top quark mass measurement using the template method in the lepton plus jets channel at CDF II -: art. no. 032003 [J].
Abulencia, A ;
Acosta, D ;
Adelman, J ;
Affolder, T ;
Akimoto, T ;
Albrow, MG ;
Ambrose, D ;
Amerio, S ;
Amidei, D ;
Anastassov, A ;
Anikeev, K ;
Annovi, A ;
Antos, J ;
Aoki, M ;
Apollinari, G ;
Arguin, JF ;
Arisawa, T ;
Artikov, A ;
Ashmanskas, W ;
Attal, A ;
Azfar, F ;
Azzi-Bacchetta, P ;
Azzurri, P ;
Bacchetta, N ;
Bachacou, H ;
Badgett, W ;
Barbaro-Galtieri, A ;
Barnes, VE ;
Barnett, BA ;
Baroiant, S ;
Bartsch, V ;
Bauer, G ;
Bedeschi, F ;
Behari, S ;
Belforte, S ;
Bellettini, G ;
Bellinger, J ;
Belloni, A ;
Ben-Haim, E ;
Benjamin, D ;
Beretvas, A ;
Beringer, J ;
Berry, T ;
Bhatti, A ;
Binkley, M ;
Bisello, D ;
Bishai, M ;
Blair, RE ;
Blocker, C ;
Bloom, K .
PHYSICAL REVIEW D, 2006, 73 (03)
[8]   Measurement of the J/ψ meson and b-hadron production cross sections in p(p)over-bar collisions at √s=1960 GeV -: art. no. 032001 [J].
Acosta, D ;
Adelman, J ;
Affolder, T ;
Akimoto, T ;
Albrow, MG ;
Ambrose, D ;
Amerio, S ;
Amidei, D ;
Anastassov, A ;
Anikeev, K ;
Annovi, A ;
Antos, J ;
Aoki, M ;
Apollinari, G ;
Arisawa, T ;
Arguin, JF ;
Artikov, A ;
Ashmanskas, W ;
Attal, A ;
Azfar, F ;
Azzi-Bacchetta, P ;
Bacchetta, N ;
Bachacou, H ;
Badgett, W ;
Barbaro-Galtieri, A ;
Barker, GJ ;
Barnes, VE ;
Barnett, BA ;
Baroiant, S ;
Barone, M ;
Bauer, G ;
Bedeschi, F ;
Behari, S ;
Belforte, S ;
Bellettini, G ;
Bellinger, J ;
Ben-Haim, E ;
Benjamin, D ;
Beretvas, A ;
Bhatti, A ;
Binkley, M ;
Bisello, D ;
Bishai, M ;
Blair, RE ;
Blocker, C ;
Bloom, K ;
Blumenfeld, B ;
Bocci, A ;
Bodek, A ;
Bolla, G .
PHYSICAL REVIEW D, 2005, 71 (03) :032001-1
[9]   Measurement of the t(t)over-bar production cross section in p(p)over-bar collisions at √s=1.96 TeV using lepton plus jets events with secondary vertex b-tagging -: art. no. 052003 [J].
Acosta, D ;
Adelman, J ;
Affolder, T ;
Akimoto, T ;
Albrow, MG ;
Ambrose, D ;
Amerio, S ;
Amidei, D ;
Anastassov, A ;
Anikeev, K ;
Annovi, A ;
Antos, J ;
Aoki, M ;
Apollinari, G ;
Arisawa, T ;
Arguin, JF ;
Artikov, A ;
Ashmanskas, W ;
Attal, A ;
Azfar, F ;
Azzi-Bacchetta, P ;
Bacchetta, N ;
Bachacou, H ;
Badgett, W ;
Barbaro-Galtieri, A ;
Barker, GJ ;
Barnes, VE ;
Barnett, BA ;
Baroiant, S ;
Barone, M ;
Bauer, G ;
Bedeschi, F ;
Behari, S ;
Belforte, S ;
Bellettini, G ;
Bellinger, J ;
Ben-Haim, E ;
Benjamin, D ;
Beretvas, A ;
Bhatti, A ;
Binkley, M ;
Bisello, D ;
Bishai, M ;
Blair, RE ;
Blocker, C ;
Bloom, K ;
Blumenfeld, B ;
Bocci, A ;
Bodek, A ;
Bolla, G .
PHYSICAL REVIEW D, 2005, 71 (05) :1-28
[10]   Threshold resummation for the top quark charge asymmetry [J].
Almeida, Leandro G. ;
Sterman, George ;
Vogelsang, Werner .
PHYSICAL REVIEW D, 2008, 78 (01)