Measurement of the W boson helicity in top quark decays at D0

被引:20
作者
Abazov, V. M. [1 ]
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
Adams, T.
Agelou, M.
Aguilo, E.
Ahn, S. H.
Ahsan, M.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Alverson, G.
Alves, G. A.
Anastasoaie, M.
Andeen, T.
Anderson, S.
Andrieu, B.
Anzelc, M. S.
Arnoud, Y.
Arov, 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, P.
Banerjee, S.
Barberis, E.
Bargassa, P.
Baringer, P.
Barnes, C.
Barreto, J.
Bartlett, J. F.
Bassler, U.
Bauer, D.
Beale, S.
Bean, A.
Begalli, M.
Begel, M.
Belanger-Champagne, C.
Bellantoni, L.
机构
[1] Univ Buenos Aires, Buenos Aires, DF, Argentina
[2] LAFEX, Ctr Brasiliero Pesquisas Fis, Rio De Janeiro, Brazil
[3] Univ Estado Rio De Janeiro, Rio De Janeiro, Brazil
[4] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil
[5] Univ Alberta, Edmonton, AB T6G 2M7, Canada
[6] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada
[7] Univ York, Toronto, ON, Canada
[8] McGill Univ, Montreal, PQ H3A 2T5, Canada
[9] Univ Sci & Technol China, Hefei 230026, Peoples R China
[10] Univ Los Andes, Bogota, Colombia
[11] Charles Univ Prague, Ctr Particle Phys, Prague, Czech Republic
[12] Czech Tech Univ, CR-16635 Prague, Czech Republic
[13] Acad Sci Czech Republ, Inst Phys, Ctr Particle Phys, Prague, Czech Republic
[14] Univ San Francisco Quito, Quito, Ecuador
[15] Univ Clermont Ferrand, IN2P3 CNRS, Lab Phys Corpusculaire, Clermont Ferrand, France
[16] Univ Grenoble 1, IN2P3 CNRS, Lab Phys Subatom & Cosmol, Grenoble, France
[17] Univ Mediterranee, CPPM, IN2P3 CNRS, Marseille, France
[18] Lab Accelerateur Lineaire, IN2P3 CNRS, Orsay, France
[19] Univ Paris 06, LPNHE, IN2P3 CNRS, Paris, France
[20] Univ Paris 07, LPNHE, IN2P3 CNRS, Paris, France
[21] CEA Saclay, DAPNIA, Serv Phys Particules, Saclay, France
[22] Univ Strasbourg, IPHC, IN2P3 CNRS, Strasbourg, France
[23] Univ Haute Alsace, Mulhouse, France
[24] Univ Lyon 1, Inst Phys Nucl Lyon, IN2P3 CNRS, F-69622 Villeurbanne, France
[25] Rhein Westfal TH Aachen, Inst Phys A 3, Aachen, Germany
[26] Univ Bonn, Inst Phys, D-5300 Bonn, Germany
[27] Univ Freiburg, Inst Phys, Freiburg, Germany
[28] Johannes Gutenberg Univ Mainz, Inst Phys, D-6500 Mainz, Germany
[29] Univ Munich, Munich, Germany
[30] Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany
[31] Panjab Univ, Chandigarh 160014, India
[32] Univ Delhi, Delhi 110007, India
[33] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[34] Univ Coll Dublin, Dublin, Ireland
[35] Korea Univ, Korea Detector Lab, Seoul 136701, South Korea
[36] Sungkyunkwan Univ, Suwon 440746, South Korea
[37] CINVESTAV, Mexico City, DF, Mexico
[38] Univ Amsterdam, FOM Inst NIKHEF, Amsterdam, Netherlands
[39] Radboud Univ Nijmegen, NIKHEF, Nijmegen, Netherlands
[40] Joint Inst Nucl Res, Dubna, Russia
[41] Inst Theoret & Expt Phys, Moscow, Russia
[42] Moscow MV Lomonosov State Univ, Moscow, Russia
[43] Inst High Energy Phys, Protvino, Russia
[44] Petersburg Nucl Phys Inst, St Petersburg, Russia
[45] Lund Univ, Lund, Sweden
[46] Royal Inst Technol, Stockholm, Sweden
[47] Stockholm Univ, S-10691 Stockholm, Sweden
[48] Uppsala Univ, Uppsala, Sweden
[49] Univ Zurich, Inst Phys, Zurich, Switzerland
[50] Univ Lancaster, London, England
来源
PHYSICAL REVIEW D | 2007年 / 75卷 / 03期
基金
英国科学技术设施理事会;
关键词
D O I
10.1103/PhysRevD.75.031102
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a measurement of the fraction f(+) of right-handed W bosons produced in top quark decays, based on a candidate sample of tt events in the l + jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb(-1) collected by the D0 detector at the Fermilab Tevatron pp Collider at root s = 1.96 TeV. We reconstruct the decay angle theta* for each lepton. By comparing the cos theta* distribution from the data with that for the expected background and signal for various values of f(+) (where we assume that the fraction of longitudinally-polarized W bosons has the standard model value of 0.70), we find f(+) = 0.056 +/- 0.080 (stat) +/- 0.057 (syst) (f(+) < 0.23 at 95% C. L.), consistent with the standard model prediction of f(+) = 3.6 X 10(-4).
引用
收藏
页数:8
相关论文
共 22 条
[1]   Helicity of the W boson in lepton plus jets t(t)over-bar events [J].
Abazov, V ;
Abbott, B ;
Abdesselam, A ;
Abolins, M ;
Abramov, V ;
Acharya, BS ;
Adams, DL ;
Adams, M ;
Ahmed, SN ;
Alexeev, GD ;
Alton, A ;
Alves, GA ;
Arnoud, Y ;
Avila, C ;
Babintsev, VV ;
Babukhadia, L ;
Bacon, TC ;
Baden, A ;
Baffioni, S ;
Baldin, B ;
Balm, PW ;
Banerjee, S ;
Barberis, E ;
Baringer, P ;
Barreto, J ;
Bartlett, KF ;
Bassler, U ;
Bauer, D ;
Bean, A ;
Beaudette, F ;
Begel, M ;
Belyaev, A ;
Beri, SB ;
Bernardi, G ;
Bertram, I ;
Besson, A ;
Beuselinck, R ;
Bezzubov, VA ;
Bhat, PC ;
Bhatnagar, V ;
Bhattacharjee, M ;
Blazey, G ;
Blekman, F ;
Blessing, S ;
Boehnlein, A ;
Bojko, NI ;
Bolton, TA ;
Borcherding, F ;
Bos, K ;
Bose, T .
PHYSICS LETTERS B, 2005, 617 (1-2) :1-10
[2]   The upgraded DO detector [J].
Abazov, V. M. ;
Abbott, B. ;
Abolins, M. ;
Acharya, B. S. ;
Adams, D. L. ;
Adams, M. ;
Adams, T. ;
Agelou, M. ;
Agram, J. -L. ;
Ahmed, S. N. ;
Ahn, S. H. ;
Ahsan, M. ;
Alexeev, G. D. ;
Alkhazov, G. ;
Alton, A. ;
Alverson, G. ;
Alves, G. A. ;
Anastasoaie, M. ;
Andeen, T. ;
Anderson, J. T. ;
Anderson, S. ;
Andrieu, B. ;
Angstadt, R. ;
Anosov, V. ;
Arnoud, Y. ;
Arov, M. ;
Askew, A. ;
Asman, B. ;
Assis Jesus, A. C. S. ;
Atramentov, O. ;
Autermann, C. ;
Avila, C. ;
Babukhadia, L. ;
Bacon, T. C. ;
Badaud, F. ;
Baden, A. ;
Baffioni, S. ;
Bagby, L. ;
Baldin, B. ;
Balm, P. W. ;
Banerjee, P. ;
Banerjee, S. ;
Barberis, E. ;
Bardon, O. ;
Barg, W. ;
Bargassa, P. ;
Baringer, P. ;
Barnes, C. ;
Barreto, J. ;
Bartlett, J. F. .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2006, 565 (02) :463-537
[3]   Search for right-handed W bosons in top quark decay -: art. no. 011104 [J].
Abazov, VM ;
Abbott, B ;
Abolins, M ;
Acharya, BS ;
Adams, M ;
Adams, T ;
Agelou, M ;
Agram, JL ;
Ahn, SH ;
Ahsan, M ;
Alexeev, GD ;
Alkhazov, G ;
Alton, A ;
Alverson, G ;
Alves, GA ;
Anastasoaie, M ;
Andeen, T ;
Anderson, S ;
Andrieu, B ;
Arnoud, Y ;
Askew, A ;
Åsman, B ;
Jesus, ACSA ;
Atramentov, O ;
Autermann, C ;
Avila, C ;
Badaud, F ;
Baden, A ;
Baldin, B ;
Balm, PW ;
Banerjee, S ;
Barberis, E ;
Bargassa, P ;
Baringer, P ;
Barnes, C ;
Barreto, J ;
Bartlett, JF ;
Bassler, U ;
Bauer, D ;
Bean, A ;
Beauceron, S ;
Begel, M ;
Bellavance, A ;
Beri, SB ;
Bernardi, G ;
Bernhard, R ;
Bertram, I ;
Besançon, M ;
Beuselinck, R ;
Bezzubov, VA .
PHYSICAL REVIEW D, 2005, 72 (01) :1-8
[4]   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 lifetime b-tagging [J].
Abazov, VM ;
Abbott, B ;
Abolins, M ;
Acharya, BS ;
Adams, M ;
Adams, T ;
Agelou, M ;
Agram, JL ;
Ahn, SH ;
Ahsan, M ;
Alexeev, GD ;
Alkhazov, G ;
Alton, A ;
Alverson, G ;
Alves, GA ;
Anastasoaie, M ;
Andeen, T ;
Anderson, S ;
Andrieu, B ;
Arnoud, Y ;
Askew, A ;
Åsman, B ;
Jesus, ACSA ;
Atramentov, O ;
Autermann, C ;
Avila, C ;
Badaud, F ;
Baden, A ;
Baldin, B ;
Balm, PW ;
Banerjee, S ;
Barberis, E ;
Bargassa, P ;
Baringer, P ;
Barnes, C ;
Barreto, J ;
Bartlett, JF ;
Bassler, U ;
Bauer, D ;
Bean, A ;
Beauceron, S ;
Begalli, M ;
Begel, M ;
Bellavance, A ;
Beri, SB ;
Bernardi, G ;
Bernhard, R ;
Bertram, I ;
Besançon, M ;
Beuselinck, R .
PHYSICS LETTERS B, 2005, 626 :35-44
[5]   Measurement of the t(t)over-bar production cross section in p(p)over-bar collisions at √s=1.96 TeV using kinematic characteristics of lepton plus jets events [J].
Abazov, VM ;
Abbott, B ;
Abolins, M ;
Acharya, BS ;
Adams, M ;
Adams, T ;
Agelou, M ;
Agram, JL ;
Ahn, SH ;
Ahsan, M ;
Alexeev, GD ;
Alkhazov, G ;
Alton, A ;
Alverson, G ;
Alves, GA ;
Anastasoaie, M ;
Andeen, T ;
Anderson, S ;
Andrieu, B ;
Arnoud, Y ;
Askew, A ;
Åsman, B ;
Jesus, ACSA ;
Atramentov, O ;
Autermann, C ;
Avila, C ;
Badaud, F ;
Baden, A ;
Baldin, B ;
Balm, PW ;
Banerjee, S ;
Barberis, E ;
Bargassa, P ;
Baringer, P ;
Barnes, C ;
Barreto, J ;
Bartlett, JF ;
Bassler, U ;
Bauer, D ;
Bean, A ;
Beauceron, S ;
Begalli, M ;
Begel, M ;
Bellavance, A ;
Beri, SB ;
Bernardi, G ;
Bernhard, R ;
Bertram, I ;
Besançon, M ;
Beuselinck, R .
PHYSICS LETTERS B, 2005, 626 :45-54
[6]  
ABAZOV VM, UNPUB MEASUREMENT TT
[7]   Direct measurement of the top quark mass by the DO Collaboration [J].
Abbott, B ;
Abolins, M ;
Acharya, BS ;
Adam, I ;
Adams, DL ;
Adams, M ;
Ahn, S ;
Aihara, H ;
Alves, GA ;
Amos, N ;
Anderson, EW ;
Astur, R ;
Baarmand, MM ;
Baden, A ;
Balamurali, V ;
Balderston, J ;
Baldin, B ;
Banerjee, S ;
Bantly, J ;
Barberis, E ;
Bartlett, JF ;
Bazizi, K ;
Belyaev, A ;
Beri, SB ;
Bertram, I ;
Bezzubov, VA ;
Bhat, PC ;
Bhatnagar, V ;
Bhattacharjee, M ;
Biswas, N ;
Blazey, G ;
Blessing, S ;
Bloom, P ;
Boehnlein, A ;
Bojko, NI ;
Borcherding, F ;
Boswell, C ;
Brandt, A ;
Brock, R ;
Bross, A ;
Buchholz, D ;
Burtovoi, VS ;
Butler, JM ;
Carvalho, W ;
Casey, D ;
Casilum, Z ;
Castilla-Valdez, H ;
Chakraborty, D ;
Chang, SM ;
Chekulaev, SV .
PHYSICAL REVIEW D, 1998, 58 (05) :520011-520012+5200139
[8]   Measurement of the helicity of W bosons in top-quark decays [J].
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. ;
Bishai, M. ;
Blair, R. E. ;
Blocker, C. ;
Bloom, K. .
PHYSICAL REVIEW D, 2006, 73 (11)
[9]   Measurement of the W boson polarization in top decay at CDF at √s=1.8 TeV -: art. no. 031101 [J].
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 .
PHYSICAL REVIEW D, 2005, 71 (03) :031101-1
[10]   Measurement of the helicity of W bosons in top quark decays [J].
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, MW ;
Bailey, S ;
de Barbaro, P ;
Barbaro-Galtieri, A ;
Barnes, VE ;
Barnett, BA ;
Barone, M ;
Bauer, G ;
Bedeschi, F ;
Belforte, S ;
Bellettini, G ;
Bellinger, J ;
Benjamin, D ;
Bensinger, J ;
Beretvas, A ;
Berge, JP ;
Berryhill, J ;
Bertolucci, S ;
Bevensee, B ;
Bhatti, A ;
Bigongiari, C ;
Binkley, M ;
Bisello, B ;
Blair, RE ;
Blocker, C ;
Bloom, K ;
Blumenfeld, B ;
Blusk, BS ;
Bocci, A ;
Bodek, A ;
Bokhari, W ;
Bolla, G ;
Bonushkin, Y ;
Bortoletto, D ;
Boudreau, J .
PHYSICAL REVIEW LETTERS, 2000, 84 (02) :216-221