Measurement of W-boson helicity fractions in top-quark decays using cosθ

被引：14

作者：

Aaltonen, T. ^{[27
,28
]}

Adelman, J. ^{[16
]}

Akimoto, T. ^{[36
]}

Alvarez Gonzalez, B. ^{[14
]}

Amerio, S. ^{[53
,54
]}

Amidei, D. ^{[50
]}

Anastassov, A. ^{[58
]}

Annovi, A. ^{[23
]}

Antos, J. ^{[17
,18
]}

Apollinari, G. ^{[21
]}

Apresyan, A. ^{[43
]}

Arisawa, T. ^{[34
]}

Artikov, A. ^{[19
]}

Ashmanskas, W. ^{[21
]}

Attal, A. ^{[5
]}

Aurisano, A. ^{[37
]}

Azfar, F. ^{[52
]}

Badgett, W. ^{[21
]}

Barbaro-Galtieri, A. ^{[64
]}

Barnes, V. E. ^{[43
]}

Barnett, B. A. ^{[30
]}

Barria, P. ^{[48
,49
]}

Bartsch, V. ^{[62
]}

Bauer, G. ^{[65
]}

Beauchemin, P-H. ^{[66
,67
,68
,69
]}

Bedeschi, F. ^{[48
,49
]}

Beecher, D. ^{[62
]}

Behari, S. ^{[30
]}

Bellettini, G. ^{[48
,49
]}

Bellinger, J. ^{[32
]}

Benjamin, D. ^{[20
]}

Beretvas, A. ^{[21
]}

Beringer, J. ^{[64
]}

Bhatti, A. ^{[41
]}

Binkley, M. ^{[21
]}

Bisello, D. ^{[53
,54
]}

Bizjak, I. ^{[62
]}

Blair, R. E. ^{[3
]}

Blocker, C. ^{[9
]}

Blumenfeld, B. ^{[30
]}

Bocci, A. ^{[20
]}

Bodek, A. ^{[42
]}

Boisvert, V. ^{[42
]}

Bolla, G. ^{[43
]}

Bortoletto, D. ^{[43
]}

Boudreau, J. ^{[44
]}

Boveia, A. ^{[13
]}

Brau, B. ^{[13
]}

Bridgeman, A. ^{[29
]}

Brigliadori, L. ^{[7
,8
]}

机构：

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

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

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

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

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

[6] Baylor Univ, Waco, TX 76798 USA

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

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

[9] Brandeis Univ, Waltham, MA 02254 USA

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

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

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

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

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

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

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

[17] Slovak Acad Sci, Inst Expt Phys, Kosice 04001, Slovakia

[18] Comenius Univ, Bratislava 84248, Slovakia

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

[20] Duke Univ, Durham, NC 27708 USA

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

[22] Univ Florida, Gainesville, FL 32611 USA

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

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

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

[26] Harvard Univ, Cambridge, MA 02138 USA

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

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

[29] Univ Illinois, Urbana, IL 61801 USA

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

[31] Yale Univ, New Haven, CT 06520 USA

[32] Univ Wisconsin, Madison, WI 53706 USA

[33] Wayne State Univ, Detroit, MI 48201 USA

[34] Waseda Univ, Tokyo 169, Japan

[35] Tufts Univ, Medford, MA 02155 USA

[36] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan

[37] Texas A&M Univ, College Stn, TX 77843 USA

[38] Rutgers State Univ, Piscataway, NJ 08855 USA

[39] Ist Nazl Fis Nucl Trieste Udine, I-34100 Trieste, Italy

[40] Univ Trieste Udine, I-33100 Udine, Italy

[41] Rockefeller Univ, New York, NY 10021 USA

[42] Univ Rochester, Rochester, NY 14627 USA

[43] Purdue Univ, W Lafayette, IN 47907 USA

[44] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[45] Univ Penn, Philadelphia, PA 19104 USA

[46] Univ Roma La Sapienza, I-00185 Rome, Italy

[47] Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy

[48] Univ Siena, Univ Pisa, Ist Nazl Fis Nucl Pisa, I-56127 Pisa, Italy

[49] Scuola Normale Super Pisa, I-56127 Pisa, Italy

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

来源：

PHYSICS LETTERS B | 2009年 / 674卷 / 03期

基金：

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

关键词：

Helicity; W boson; Top quark; SEMILEPTONIC DECAYS; QCD CORRECTIONS;

D O I：

10.1016/j.physletb.2009.02.040

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fully reconstructed a t (t) over bar -> W(+)bW(-)(b) over bar -> l nu q (q) over bar 'b (b) over bar events are used to determine the fractions of right-handed (f(+)) and longitudinally polarized (f(0)) W bosons produced in top-quark decays. The helicity fractions are sensitive to the couplings and the Dirac structure of the Wtb vertex. This Letter reports measurements of the W-boson helicity fractions from two different methods using data corresponding to an integrated luminosity of 1.9 fb(-1) of pp collisions at a center-of-mass energy of 1.96 TeV collected by the CDF II detector operating at the Fermilab Tevatron. Combining the results from the two methods, we find f(0) = 0.62 +/- 0.10(stat) +/- 0.05(syst) under the assumption that f(+) = 0, and f(+) = -0.04 +/- 0.04(stat) +/- 0.03(syst) with f(0) fixed to the theoretically expected value of 0.70. Model-independent fits are also performed and simultaneously determine f(0) =0.66 +/- 0.16(stat) +/- 0.05(syst) and f(+) = -0.03 +/- 0.06(stat) +/- 0.03(syst). All these results are consistent with standard model expectations. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：160 / 167

页数：8

共 34 条

[1] Forward-Backward Asymmetry in Top-Quark Production in p(p)over-bar Collisions at √s=1.96 TeV
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.
[J]. PHYSICAL REVIEW LETTERS, 2008, 101 (20)
[2] Model-independent measurement of the W-boson helicity in top-quark decays at D0
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.
Amoud, 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.
[J]. PHYSICAL REVIEW LETTERS, 2008, 100 (06)
[3] Measurement of the t(t)over-bar production cross section in p(p)over-bar collisions at √s=1.96 TeV
Abulencia, A.
Acosta, D.
Adelman, J.
Affolder, T.
Akimoto, T.
Albrow, M. G.
Ambrose, D.
Amerio, S.
Amidei, D.
Anastassov, A.
Anikeev, K.
Annovi, A.
Antos, J.
Aoki, M.
Apollinari, G.
Arguin, J. -F.
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, V. E.
Barnett, B. A.
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.
Blair, R. E.
Blocker, C.
Blumenfeld, B.
Bocci, A.
[J]. PHYSICAL REVIEW LETTERS, 2006, 97 (08)
[4] Measurement of the helicity fractions of W bosons from top quark decays using fully reconstructed t(t)over-bar events with CDF II
Abulencia, A.
Adelman, J.
Affolder, T.
Akimoto, T.
Albrow, M. G.
Ambrose, D.
Amerio, S.
Amidei, D.
Anastassov, A.
Anikeev, K.
Annovi, A.
Antos, J.
Aoki, M.
Apollinari, G.
Arguin, J. -F.
Arisawa, T.
Artikov, A.
Ashmanskas, W.
Attal, A.
Azfar, F.
Azzi-Bacchetta, P.
Azzurri, P.
Bacchetta, N.
Badgett, W.
Barbaro-Galtieri, A.
Barnes, V. E.
Barnett, B. A.
Baroiant, S.
Bartsch, V.
Bauer, G.
Bedeschi, F.
Behari, S.
Belforte, S.
Bellettini, G.
Bellinger, J.
Belloni, A.
Benjamin, D.
Beretvas, A.
Beringer, J.
Berry, T.
Bhatti, A.
Binkley, M.
Bisello, D.
Blair, R. E.
Blocker, C.
Blumenfeld, B.
Bocci, A.
Bodek, A.
Boisvert, V.
Bolla, G.
[J]. PHYSICAL REVIEW D, 2007, 75 (05):
[5] Top quark mass measurement using the template method in the lepton plus jets channel at CDF II -: art. no. 032003
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
[J]. PHYSICAL REVIEW D, 2006, 73 (03):
[6] Measurement of the W boson polarization in top decay at CDF at √s=1.8 TeV -: art. no. 031101
Acosta, D
Affolder, T
Albrow, MG
Ambrose, D
Amidei, D
Anikeev, K
Antos, J
Apollinari, G
Arisawa, T
Artikov, A
Ashmanskas, W
Azfar, F
Azzi-Bacchetta, P
Bacchetta, N
Bachacou, H
Badgett, W
Barbaro-Galtieri, A
Barnes, VE
Barnett, BA
Baroiant, S
Barone, M
Bauer, G
Bedeschi, F
Behari, S
Belforte, S
Bell, WH
Bellettini, G
Bellinger, J
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
Bolshov, A
Bortoletto, D
Boudreau, J
Bromberg, C
Brubaker, E
Budagov, J
Budd, HS
Burkett, K
Busetto, G
[J]. PHYSICAL REVIEW D, 2005, 71 (03): : 031101 - 1
[7] MadGraph/MadEvent v4: the new web generation
Alwall, Johan
Demin, Pavel
de Visscher, Simon
Frederix, Rikkert
Herquet, Michel
Maltoni, Fabio
Plehn, Tilman
Rainwaterd, David L.
Stelzer, Tim
[J]. JOURNAL OF HIGH ENERGY PHYSICS, 2007, (09):
[8] Determination of the jet energy scale at the Collider Detector at Fermilab
Bhatti, A.
Canelli, F.
Heinemann, B.
Adelman, J.
Ambrose, D.
Arguin, J. -F.
Barbaro-Galtieri, A.
Budd, H.
Chung, Y. S.
Chung, K.
Cooper, B.
Currat, C.
D'Onofrio, M.
Dorigo, T.
Erbacher, R.
Field, R.
Flanagan, G.
Gibson, A.
Hatakeyama, K.
Happacher, F.
Hoffman, D.
Introzzi, G.
Kuhlmann, S.
Kwang, S.
Jun, S.
Latino, G.
Malkus, A.
Mattson, M.
Mehta, A.
Movilla-Fernandez, P. A.
Nodulman, L.
Paulini, M.
Proudfoot, J.
Ptohos, F.
Sabik, S.
Sakumoto, W.
Savard, P.
Shochet, M.
Sinervo, P.
Tiwari, V.
Wicklund, A.
Yun, G.
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2006, 566 (02) : 375 - 412
[9] The t(t)over-bar cross-section at 1.8 and 1.96 TeV:: a study of the systematics due to parton densities and scale dependence -: art. no. 068
Cacciari, M
Frixione, S
Ridolfi, G
Mangano, ML
Nason, P
[J]. JOURNAL OF HIGH ENERGY PHYSICS, 2004, (04):
[10] General analysis of single top production and W helicity in top decay
Chen, CR
Larios, F
Yuan, CP
[J]. PHYSICS LETTERS B, 2005, 631 (03) : 126 - 132

← 1 2 3 4 →