Evidence for spin correlation in ttbar production
We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data correspondi...
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| Veröffentlicht in: | Physical review letters 2012, Vol.108 |
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| creator | Abazov, V.M. Abbott, B. Acharya, B.S. Adams, M. Adams, T. Alexeev, G.D. Alkhazov, G. Alton, A. Alverson, G. Alves, G.A. Aoki, M. Askew, A. Asman, B. Atkins, S. Atramentov, O. Augsten, K. Avila, C. Backusmayes, J. Badaud, F. Bagby, L. Baldin, B. Bandurin, D.V. Banerjee, S. Barberis, E. Baringer, P. Barreto, J. Bartlett, J.F. Bassler, U. Bazterra, V. Bean, A. Begalli, M. Belanger-Champagne, C. Bellantoni, L. Beri, S.B. Bernardi, G. Bernhard, R. Bertram, I. Besançon, M. Beuselinck, R. Bezzubov, V.A. Bhat, P.C. Bhatnagar, V. Blazey, G. Blessing, S. Bloom, K. Boehnlein, A. Boline, D. Boos, E.E. Borissov, G. Bose, T. Brandt, A. Brandt, O. Brock, R. Brooijmans, G. Bross, A. Brown, D. Brown, J. Bu, X.B. Buehler, M. Buescher, V. Bunichev, V. Burdin, S. Burnett, T.H. Buszello, C.P. Calpas, B. Camacho-Pérez, E. Carrasco-Lizarraga, M.A. Casey, B.C.K. Castilla-Valdez, H. Chakrabarti, S. Chakraborty, D. Chan, K.M. Chandra, A. Chapon, E. Chen, G. Chevalier-Théry, S. Cho, D.K. Cho, S.W. Choi, S. K. Choudhary, B. Cihangir, S. Claes, D. Clutter, J. Cooke, M. Cooper, W.E. Corcoran, M. Couderc, F. Cousinou, M.-C. Croc, A. Cutts, D. Das, A. Davies, G. De, K. de Jong, S.J. de La Cruz-Burelo, E. Déliot, F. Demina, R. Denisov, D. Denisov, S.P. Desai, S. |
| description | We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations. |
| doi_str_mv | 10.1103/PhysRevLett.108.032004 |
| format | Article |
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K. ; Choudhary, B. ; Cihangir, S. ; Claes, D. ; Clutter, J. ; Cooke, M. ; Cooper, W.E. ; Corcoran, M. ; Couderc, F. ; Cousinou, M.-C. ; Croc, A. ; Cutts, D. ; Das, A. ; Davies, G. ; De, K. ; de Jong, S.J. ; de La Cruz-Burelo, E. ; Déliot, F. ; Demina, R. ; Denisov, D. ; Denisov, S.P. ; Desai, S.</creator><creatorcontrib>Abazov, V.M. ; Abbott, B. ; Acharya, B.S. ; Adams, M. ; Adams, T. ; Alexeev, G.D. ; Alkhazov, G. ; Alton, A. ; Alverson, G. ; Alves, G.A. ; Aoki, M. ; Askew, A. ; Asman, B. ; Atkins, S. ; Atramentov, O. ; Augsten, K. ; Avila, C. ; Backusmayes, J. ; Badaud, F. ; Bagby, L. ; Baldin, B. ; Bandurin, D.V. ; Banerjee, S. ; Barberis, E. ; Baringer, P. ; Barreto, J. ; Bartlett, J.F. ; Bassler, U. ; Bazterra, V. ; Bean, A. ; Begalli, M. ; Belanger-Champagne, C. ; Bellantoni, L. ; Beri, S.B. ; Bernardi, G. ; Bernhard, R. ; Bertram, I. ; Besançon, M. ; Beuselinck, R. ; Bezzubov, V.A. ; Bhat, P.C. ; Bhatnagar, V. ; Blazey, G. ; Blessing, S. ; Bloom, K. ; Boehnlein, A. ; Boline, D. ; Boos, E.E. ; Borissov, G. ; Bose, T. ; Brandt, A. ; Brandt, O. ; Brock, R. ; Brooijmans, G. ; Bross, A. ; Brown, D. ; Brown, J. ; Bu, X.B. ; Buehler, M. ; Buescher, V. ; Bunichev, V. ; Burdin, S. ; Burnett, T.H. ; Buszello, C.P. ; Calpas, B. ; Camacho-Pérez, E. ; Carrasco-Lizarraga, M.A. ; Casey, B.C.K. ; Castilla-Valdez, H. ; Chakrabarti, S. ; Chakraborty, D. ; Chan, K.M. ; Chandra, A. ; Chapon, E. ; Chen, G. ; Chevalier-Théry, S. ; Cho, D.K. ; Cho, S.W. ; Choi, S. K. ; Choudhary, B. ; Cihangir, S. ; Claes, D. ; Clutter, J. ; Cooke, M. ; Cooper, W.E. ; Corcoran, M. ; Couderc, F. ; Cousinou, M.-C. ; Croc, A. ; Cutts, D. ; Das, A. ; Davies, G. ; De, K. ; de Jong, S.J. ; de La Cruz-Burelo, E. ; Déliot, F. ; Demina, R. ; Denisov, D. ; Denisov, S.P. ; Desai, S.</creatorcontrib><description>We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. 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K.</creatorcontrib><creatorcontrib>Choudhary, B.</creatorcontrib><creatorcontrib>Cihangir, S.</creatorcontrib><creatorcontrib>Claes, D.</creatorcontrib><creatorcontrib>Clutter, J.</creatorcontrib><creatorcontrib>Cooke, M.</creatorcontrib><creatorcontrib>Cooper, W.E.</creatorcontrib><creatorcontrib>Corcoran, M.</creatorcontrib><creatorcontrib>Couderc, F.</creatorcontrib><creatorcontrib>Cousinou, M.-C.</creatorcontrib><creatorcontrib>Croc, A.</creatorcontrib><creatorcontrib>Cutts, D.</creatorcontrib><creatorcontrib>Das, A.</creatorcontrib><creatorcontrib>Davies, G.</creatorcontrib><creatorcontrib>De, K.</creatorcontrib><creatorcontrib>de Jong, S.J.</creatorcontrib><creatorcontrib>de La Cruz-Burelo, E.</creatorcontrib><creatorcontrib>Déliot, F.</creatorcontrib><creatorcontrib>Demina, R.</creatorcontrib><creatorcontrib>Denisov, D.</creatorcontrib><creatorcontrib>Denisov, S.P.</creatorcontrib><creatorcontrib>Desai, S.</creatorcontrib><title>Evidence for spin correlation in ttbar production</title><title>Physical review letters</title><description>We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.</description><subject>High Energy Physics - Experiment</subject><subject>Physics</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqViksKwjAYBoMoWB9XkOyl9fubanUporjoQsR9iDVipDYliQVvr4IXcDXMMIxNCAkRxOxwe_mjbgsdQkJYJhApkHVYRMhXcU6UdVkECIpXQN5nA-_vAChdLCNG29ZcdF1qfrWO-8bUvLTO6UoFY2v-0RDOyvHG2cuz_LYR611V5fX4xyGb7ranzT6-qUo2zjyUe0mrjNyvC2nqtBESWIgMc2pJ_He_AdZ-QdU</recordid><startdate>2012</startdate><enddate>2012</enddate><creator>Abazov, V.M.</creator><creator>Abbott, B.</creator><creator>Acharya, B.S.</creator><creator>Adams, M.</creator><creator>Adams, T.</creator><creator>Alexeev, G.D.</creator><creator>Alkhazov, G.</creator><creator>Alton, A.</creator><creator>Alverson, G.</creator><creator>Alves, G.A.</creator><creator>Aoki, M.</creator><creator>Askew, A.</creator><creator>Asman, B.</creator><creator>Atkins, S.</creator><creator>Atramentov, O.</creator><creator>Augsten, K.</creator><creator>Avila, C.</creator><creator>Backusmayes, J.</creator><creator>Badaud, F.</creator><creator>Bagby, L.</creator><creator>Baldin, B.</creator><creator>Bandurin, D.V.</creator><creator>Banerjee, S.</creator><creator>Barberis, E.</creator><creator>Baringer, P.</creator><creator>Barreto, J.</creator><creator>Bartlett, J.F.</creator><creator>Bassler, U.</creator><creator>Bazterra, V.</creator><creator>Bean, A.</creator><creator>Begalli, M.</creator><creator>Belanger-Champagne, C.</creator><creator>Bellantoni, L.</creator><creator>Beri, S.B.</creator><creator>Bernardi, G.</creator><creator>Bernhard, R.</creator><creator>Bertram, I.</creator><creator>Besançon, M.</creator><creator>Beuselinck, R.</creator><creator>Bezzubov, V.A.</creator><creator>Bhat, P.C.</creator><creator>Bhatnagar, V.</creator><creator>Blazey, G.</creator><creator>Blessing, S.</creator><creator>Bloom, K.</creator><creator>Boehnlein, A.</creator><creator>Boline, D.</creator><creator>Boos, E.E.</creator><creator>Borissov, G.</creator><creator>Bose, T.</creator><creator>Brandt, A.</creator><creator>Brandt, O.</creator><creator>Brock, R.</creator><creator>Brooijmans, G.</creator><creator>Bross, A.</creator><creator>Brown, D.</creator><creator>Brown, J.</creator><creator>Bu, X.B.</creator><creator>Buehler, M.</creator><creator>Buescher, V.</creator><creator>Bunichev, V.</creator><creator>Burdin, S.</creator><creator>Burnett, T.H.</creator><creator>Buszello, C.P.</creator><creator>Calpas, B.</creator><creator>Camacho-Pérez, E.</creator><creator>Carrasco-Lizarraga, M.A.</creator><creator>Casey, B.C.K.</creator><creator>Castilla-Valdez, H.</creator><creator>Chakrabarti, S.</creator><creator>Chakraborty, D.</creator><creator>Chan, K.M.</creator><creator>Chandra, A.</creator><creator>Chapon, E.</creator><creator>Chen, G.</creator><creator>Chevalier-Théry, S.</creator><creator>Cho, D.K.</creator><creator>Cho, S.W.</creator><creator>Choi, S. K.</creator><creator>Choudhary, B.</creator><creator>Cihangir, S.</creator><creator>Claes, D.</creator><creator>Clutter, J.</creator><creator>Cooke, M.</creator><creator>Cooper, W.E.</creator><creator>Corcoran, M.</creator><creator>Couderc, F.</creator><creator>Cousinou, M.-C.</creator><creator>Croc, A.</creator><creator>Cutts, D.</creator><creator>Das, A.</creator><creator>Davies, G.</creator><creator>De, K.</creator><creator>de Jong, S.J.</creator><creator>de La Cruz-Burelo, E.</creator><creator>Déliot, F.</creator><creator>Demina, R.</creator><creator>Denisov, D.</creator><creator>Denisov, S.P.</creator><creator>Desai, S.</creator><general>American Physical Society</general><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0003-0585-7030</orcidid><orcidid>https://orcid.org/0000-0002-2837-2442</orcidid><orcidid>https://orcid.org/0000-0001-6115-5856</orcidid><orcidid>https://orcid.org/0000-0002-0574-6018</orcidid><orcidid>https://orcid.org/0000-0002-8575-405X</orcidid><orcidid>https://orcid.org/0000-0003-3090-2948</orcidid><orcidid>https://orcid.org/0000-0002-2837-2442</orcidid></search><sort><creationdate>2012</creationdate><title>Evidence for spin correlation in ttbar production</title><author>Abazov, V.M. ; Abbott, B. ; Acharya, B.S. ; Adams, M. ; Adams, T. ; Alexeev, G.D. ; Alkhazov, G. ; Alton, A. ; Alverson, G. ; Alves, G.A. ; Aoki, M. ; Askew, A. ; Asman, B. ; Atkins, S. ; Atramentov, O. ; Augsten, K. ; Avila, C. ; Backusmayes, J. ; Badaud, F. ; Bagby, L. ; Baldin, B. ; Bandurin, D.V. ; Banerjee, S. ; Barberis, E. ; Baringer, P. ; Barreto, J. ; Bartlett, J.F. ; Bassler, U. ; Bazterra, V. ; Bean, A. ; Begalli, M. ; Belanger-Champagne, C. ; Bellantoni, L. ; Beri, S.B. ; Bernardi, G. ; Bernhard, R. ; Bertram, I. ; Besançon, M. ; Beuselinck, R. ; Bezzubov, V.A. ; Bhat, P.C. ; Bhatnagar, V. ; Blazey, G. ; Blessing, S. ; Bloom, K. ; Boehnlein, A. ; Boline, D. ; Boos, E.E. ; Borissov, G. ; Bose, T. ; Brandt, A. ; Brandt, O. ; Brock, R. ; Brooijmans, G. ; Bross, A. ; Brown, D. ; Brown, J. ; Bu, X.B. ; Buehler, M. ; Buescher, V. ; Bunichev, V. ; Burdin, S. ; Burnett, T.H. ; Buszello, C.P. ; Calpas, B. ; Camacho-Pérez, E. ; Carrasco-Lizarraga, M.A. ; Casey, B.C.K. ; Castilla-Valdez, H. ; Chakrabarti, S. ; Chakraborty, D. ; Chan, K.M. ; Chandra, A. ; Chapon, E. ; Chen, G. ; Chevalier-Théry, S. ; Cho, D.K. ; Cho, S.W. ; Choi, S. K. ; Choudhary, B. ; Cihangir, S. ; Claes, D. ; Clutter, J. ; Cooke, M. ; Cooper, W.E. ; Corcoran, M. ; Couderc, F. ; Cousinou, M.-C. ; Croc, A. ; Cutts, D. ; Das, A. ; Davies, G. ; De, K. ; de Jong, S.J. ; de La Cruz-Burelo, E. ; Déliot, F. ; Demina, R. ; Denisov, D. ; Denisov, S.P. ; Desai, S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-hal_primary_oai_HAL_in2p3_00634051v13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>High Energy Physics - Experiment</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Abazov, V.M.</creatorcontrib><creatorcontrib>Abbott, B.</creatorcontrib><creatorcontrib>Acharya, B.S.</creatorcontrib><creatorcontrib>Adams, M.</creatorcontrib><creatorcontrib>Adams, T.</creatorcontrib><creatorcontrib>Alexeev, G.D.</creatorcontrib><creatorcontrib>Alkhazov, G.</creatorcontrib><creatorcontrib>Alton, A.</creatorcontrib><creatorcontrib>Alverson, G.</creatorcontrib><creatorcontrib>Alves, G.A.</creatorcontrib><creatorcontrib>Aoki, M.</creatorcontrib><creatorcontrib>Askew, A.</creatorcontrib><creatorcontrib>Asman, B.</creatorcontrib><creatorcontrib>Atkins, S.</creatorcontrib><creatorcontrib>Atramentov, O.</creatorcontrib><creatorcontrib>Augsten, K.</creatorcontrib><creatorcontrib>Avila, C.</creatorcontrib><creatorcontrib>Backusmayes, J.</creatorcontrib><creatorcontrib>Badaud, F.</creatorcontrib><creatorcontrib>Bagby, L.</creatorcontrib><creatorcontrib>Baldin, B.</creatorcontrib><creatorcontrib>Bandurin, D.V.</creatorcontrib><creatorcontrib>Banerjee, S.</creatorcontrib><creatorcontrib>Barberis, E.</creatorcontrib><creatorcontrib>Baringer, P.</creatorcontrib><creatorcontrib>Barreto, J.</creatorcontrib><creatorcontrib>Bartlett, J.F.</creatorcontrib><creatorcontrib>Bassler, U.</creatorcontrib><creatorcontrib>Bazterra, V.</creatorcontrib><creatorcontrib>Bean, A.</creatorcontrib><creatorcontrib>Begalli, M.</creatorcontrib><creatorcontrib>Belanger-Champagne, C.</creatorcontrib><creatorcontrib>Bellantoni, L.</creatorcontrib><creatorcontrib>Beri, S.B.</creatorcontrib><creatorcontrib>Bernardi, G.</creatorcontrib><creatorcontrib>Bernhard, R.</creatorcontrib><creatorcontrib>Bertram, I.</creatorcontrib><creatorcontrib>Besançon, M.</creatorcontrib><creatorcontrib>Beuselinck, R.</creatorcontrib><creatorcontrib>Bezzubov, V.A.</creatorcontrib><creatorcontrib>Bhat, P.C.</creatorcontrib><creatorcontrib>Bhatnagar, V.</creatorcontrib><creatorcontrib>Blazey, G.</creatorcontrib><creatorcontrib>Blessing, S.</creatorcontrib><creatorcontrib>Bloom, K.</creatorcontrib><creatorcontrib>Boehnlein, A.</creatorcontrib><creatorcontrib>Boline, D.</creatorcontrib><creatorcontrib>Boos, E.E.</creatorcontrib><creatorcontrib>Borissov, G.</creatorcontrib><creatorcontrib>Bose, T.</creatorcontrib><creatorcontrib>Brandt, A.</creatorcontrib><creatorcontrib>Brandt, O.</creatorcontrib><creatorcontrib>Brock, R.</creatorcontrib><creatorcontrib>Brooijmans, G.</creatorcontrib><creatorcontrib>Bross, A.</creatorcontrib><creatorcontrib>Brown, D.</creatorcontrib><creatorcontrib>Brown, J.</creatorcontrib><creatorcontrib>Bu, X.B.</creatorcontrib><creatorcontrib>Buehler, M.</creatorcontrib><creatorcontrib>Buescher, V.</creatorcontrib><creatorcontrib>Bunichev, V.</creatorcontrib><creatorcontrib>Burdin, S.</creatorcontrib><creatorcontrib>Burnett, T.H.</creatorcontrib><creatorcontrib>Buszello, C.P.</creatorcontrib><creatorcontrib>Calpas, B.</creatorcontrib><creatorcontrib>Camacho-Pérez, E.</creatorcontrib><creatorcontrib>Carrasco-Lizarraga, M.A.</creatorcontrib><creatorcontrib>Casey, B.C.K.</creatorcontrib><creatorcontrib>Castilla-Valdez, H.</creatorcontrib><creatorcontrib>Chakrabarti, S.</creatorcontrib><creatorcontrib>Chakraborty, D.</creatorcontrib><creatorcontrib>Chan, K.M.</creatorcontrib><creatorcontrib>Chandra, A.</creatorcontrib><creatorcontrib>Chapon, E.</creatorcontrib><creatorcontrib>Chen, G.</creatorcontrib><creatorcontrib>Chevalier-Théry, S.</creatorcontrib><creatorcontrib>Cho, D.K.</creatorcontrib><creatorcontrib>Cho, S.W.</creatorcontrib><creatorcontrib>Choi, S. K.</creatorcontrib><creatorcontrib>Choudhary, B.</creatorcontrib><creatorcontrib>Cihangir, S.</creatorcontrib><creatorcontrib>Claes, D.</creatorcontrib><creatorcontrib>Clutter, J.</creatorcontrib><creatorcontrib>Cooke, M.</creatorcontrib><creatorcontrib>Cooper, W.E.</creatorcontrib><creatorcontrib>Corcoran, M.</creatorcontrib><creatorcontrib>Couderc, F.</creatorcontrib><creatorcontrib>Cousinou, M.-C.</creatorcontrib><creatorcontrib>Croc, A.</creatorcontrib><creatorcontrib>Cutts, D.</creatorcontrib><creatorcontrib>Das, A.</creatorcontrib><creatorcontrib>Davies, G.</creatorcontrib><creatorcontrib>De, K.</creatorcontrib><creatorcontrib>de Jong, S.J.</creatorcontrib><creatorcontrib>de La Cruz-Burelo, E.</creatorcontrib><creatorcontrib>Déliot, F.</creatorcontrib><creatorcontrib>Demina, R.</creatorcontrib><creatorcontrib>Denisov, D.</creatorcontrib><creatorcontrib>Denisov, S.P.</creatorcontrib><creatorcontrib>Desai, S.</creatorcontrib><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Physical review letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Abazov, V.M.</au><au>Abbott, B.</au><au>Acharya, B.S.</au><au>Adams, M.</au><au>Adams, T.</au><au>Alexeev, G.D.</au><au>Alkhazov, G.</au><au>Alton, A.</au><au>Alverson, G.</au><au>Alves, G.A.</au><au>Aoki, M.</au><au>Askew, A.</au><au>Asman, B.</au><au>Atkins, S.</au><au>Atramentov, O.</au><au>Augsten, K.</au><au>Avila, C.</au><au>Backusmayes, J.</au><au>Badaud, F.</au><au>Bagby, L.</au><au>Baldin, B.</au><au>Bandurin, D.V.</au><au>Banerjee, S.</au><au>Barberis, E.</au><au>Baringer, P.</au><au>Barreto, J.</au><au>Bartlett, J.F.</au><au>Bassler, U.</au><au>Bazterra, V.</au><au>Bean, A.</au><au>Begalli, M.</au><au>Belanger-Champagne, C.</au><au>Bellantoni, L.</au><au>Beri, S.B.</au><au>Bernardi, G.</au><au>Bernhard, R.</au><au>Bertram, I.</au><au>Besançon, M.</au><au>Beuselinck, R.</au><au>Bezzubov, V.A.</au><au>Bhat, P.C.</au><au>Bhatnagar, V.</au><au>Blazey, G.</au><au>Blessing, S.</au><au>Bloom, K.</au><au>Boehnlein, A.</au><au>Boline, D.</au><au>Boos, E.E.</au><au>Borissov, G.</au><au>Bose, T.</au><au>Brandt, A.</au><au>Brandt, O.</au><au>Brock, R.</au><au>Brooijmans, G.</au><au>Bross, A.</au><au>Brown, D.</au><au>Brown, J.</au><au>Bu, X.B.</au><au>Buehler, M.</au><au>Buescher, V.</au><au>Bunichev, V.</au><au>Burdin, S.</au><au>Burnett, T.H.</au><au>Buszello, C.P.</au><au>Calpas, B.</au><au>Camacho-Pérez, E.</au><au>Carrasco-Lizarraga, M.A.</au><au>Casey, B.C.K.</au><au>Castilla-Valdez, H.</au><au>Chakrabarti, S.</au><au>Chakraborty, D.</au><au>Chan, K.M.</au><au>Chandra, A.</au><au>Chapon, E.</au><au>Chen, G.</au><au>Chevalier-Théry, S.</au><au>Cho, D.K.</au><au>Cho, S.W.</au><au>Choi, S. K.</au><au>Choudhary, B.</au><au>Cihangir, S.</au><au>Claes, D.</au><au>Clutter, J.</au><au>Cooke, M.</au><au>Cooper, W.E.</au><au>Corcoran, M.</au><au>Couderc, F.</au><au>Cousinou, M.-C.</au><au>Croc, A.</au><au>Cutts, D.</au><au>Das, A.</au><au>Davies, G.</au><au>De, K.</au><au>de Jong, S.J.</au><au>de La Cruz-Burelo, E.</au><au>Déliot, F.</au><au>Demina, R.</au><au>Denisov, D.</au><au>Denisov, S.P.</au><au>Desai, S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evidence for spin correlation in ttbar production</atitle><jtitle>Physical review letters</jtitle><date>2012</date><risdate>2012</risdate><volume>108</volume><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.</abstract><pub>American Physical Society</pub><doi>10.1103/PhysRevLett.108.032004</doi><orcidid>https://orcid.org/0000-0003-0585-7030</orcidid><orcidid>https://orcid.org/0000-0002-2837-2442</orcidid><orcidid>https://orcid.org/0000-0001-6115-5856</orcidid><orcidid>https://orcid.org/0000-0002-0574-6018</orcidid><orcidid>https://orcid.org/0000-0002-8575-405X</orcidid><orcidid>https://orcid.org/0000-0003-3090-2948</orcidid><orcidid>https://orcid.org/0000-0002-2837-2442</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0031-9007 |
| ispartof | Physical review letters, 2012, Vol.108 |
| issn | 0031-9007 1079-7114 |
| language | eng |
| recordid | cdi_hal_primary_oai_HAL_in2p3_00634051v1 |
| source | American Physical Society Journals |
| subjects | High Energy Physics - Experiment Physics |
| title | Evidence for spin correlation in ttbar production |
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