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Title: Evidence for Spin Correlation in t(t)over-bar Production

Abstract

We present a measurement of the ratio of events with correlated t and {bar t} spins to the total number of t{bar t} events. This ratio f is evaluated using a matrix-element-based approach in 729 t{bar t} candidate events with a single lepton {ell} (electron or muon) and at least four jets. The analyzed p{bar p} collisions data correspond to an integrated luminosity of 5.3 fb{sup -1} and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy {radical}s = 1.96 TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in t{bar t} events with a significance of more than 3 standard deviations.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1037724
Report Number(s):
BNL-97115-2012-JA
Journal ID: ISSN 0031-9007; KA1101021; TRN: US1201690
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 3; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FERMILAB TEVATRON; LEPTONS; LUMINOSITY; PRODUCTION; SPIN; STANDARD MODEL

Citation Formats

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, Besancon, 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-Perez, 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-Thery, S, Cho, D K, Cho, S W, Choi, S, 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, Deliot, F, Demina, R, Denisov, D, Denisov, S P, Desai, S, Deterre, C, DeVaughan, K, Diehl, H T, Diesburg, M, Ding, P F, Dominguez, A, Dorland, T, Dubey, A, Dudko, L V, Duggan, D, Duperrin, A, Dutt, S, Dyshkant, A, Eads, M, Edmunds, D, Ellison, J, Elvira, V D, Enari, Y, Evans, H, Evdokimov, A, Evdokimov, V N, Facini, G, Ferbel, T, Fiedler, F, Filthaut, F, Fisher, W, Fisk, H E, Fortner, M, Fox, H, Fuess, S, Garcia-Bellido, A, Garcia-Guerra, G A, Gavrilov, V, Gay, P, Geng, W, Gerbaudo, D, Gerber, C E, Gershtein, Y, Ginther, G, Golovanov, G, Goussiou, A, Grannis, P D, Greder, S, Greenlee, H, Greenwood, Z D, Gregores, E M, Grenier, G, Gris, Ph, Grivaz, J -F, Grohsjean, A, Gruenendahl, S, Gruenewald, M W, Guillemin, T, Gutierrez, G, Gutierrez, P, Haas, A, Hagopian, S, Haley, J, Han, L, Harder, K, Harel, A, Hauptman, J M, Hays, J, Head, T, Hebbeker, T, Hedin, D, Hegab, H, Heinson, A P, Heintz, U, Hensel, C, la Cruz, I Heredia-De, Herner, K, Hesketh, G, Hildreth, M D, Hirosky, R, Hoang, T, Hobbs, J D, Hoeneisen, B, Hohlfeld, M, Hubacek, Z, Hynek, V, Iashvili, I, Ilchenko, Y, Illingworth, R, Ito, A S, Jabeen, S, Jaffre, M, Jamin, D, Jayasinghe, A, Jesik, R, Johns, K, Johnson, M, Jonckheere, A, Jonsson, P, Joshi, J, Jung, A W, Juste, A, Kaadze, K, Kajfasz, E, Karmanov, D, Kasper, P A, Katsanos, I, Kehoe, R, Kermiche, S, Khalatyan, N, Khanov, A, Kharchilava, A, Kharzheev, Y N, Kohli, J M, Kozelov, A V, Kraus, J, Kulikov, S, Kumar, A, Kupco, A, Kurca, T, Kuzmin, V A, Kvita, J, Lammers, S, Landsberg, G, Lebrun, P, Lee, H S, Lee, S W, Lee, W M, Lellouch, J, Li, L, Li, Q Z, Lietti, S M, Lim, J K, Lincoln, D, Linnemann, J, Lipaev, V V, Lipton, R, Liu, Y, Lobodenko, A, Lokajicek, M, de Sa, R Lopes, Lubatti, H J, Luna-Garcia, R, Lyon, A L, Maciel, A K. A., Mackin, D, Madar, R, Magana-Villalba, R, Malik, S, Malyshev, V L, Maravin, Y, Martinez-Ortega, J, McCarthy, R, McGivern, C L, and Meijer, M M. Evidence for Spin Correlation in t(t)over-bar Production. United States: N. p., 2012. Web. doi:10.1103/PhysRevLett.108.032004.
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, Besancon, 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-Perez, 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-Thery, S, Cho, D K, Cho, S W, Choi, S, 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, Deliot, F, Demina, R, Denisov, D, Denisov, S P, Desai, S, Deterre, C, DeVaughan, K, Diehl, H T, Diesburg, M, Ding, P F, Dominguez, A, Dorland, T, Dubey, A, Dudko, L V, Duggan, D, Duperrin, A, Dutt, S, Dyshkant, A, Eads, M, Edmunds, D, Ellison, J, Elvira, V D, Enari, Y, Evans, H, Evdokimov, A, Evdokimov, V N, Facini, G, Ferbel, T, Fiedler, F, Filthaut, F, Fisher, W, Fisk, H E, Fortner, M, Fox, H, Fuess, S, Garcia-Bellido, A, Garcia-Guerra, G A, Gavrilov, V, Gay, P, Geng, W, Gerbaudo, D, Gerber, C E, Gershtein, Y, Ginther, G, Golovanov, G, Goussiou, A, Grannis, P D, Greder, S, Greenlee, H, Greenwood, Z D, Gregores, E M, Grenier, G, Gris, Ph, Grivaz, J -F, Grohsjean, A, Gruenendahl, S, Gruenewald, M W, Guillemin, T, Gutierrez, G, Gutierrez, P, Haas, A, Hagopian, S, Haley, J, Han, L, Harder, K, Harel, A, Hauptman, J M, Hays, J, Head, T, Hebbeker, T, Hedin, D, Hegab, H, Heinson, A P, Heintz, U, Hensel, C, la Cruz, I Heredia-De, Herner, K, Hesketh, G, Hildreth, M D, Hirosky, R, Hoang, T, Hobbs, J D, Hoeneisen, B, Hohlfeld, M, Hubacek, Z, Hynek, V, Iashvili, I, Ilchenko, Y, Illingworth, R, Ito, A S, Jabeen, S, Jaffre, M, Jamin, D, Jayasinghe, A, Jesik, R, Johns, K, Johnson, M, Jonckheere, A, Jonsson, P, Joshi, J, Jung, A W, Juste, A, Kaadze, K, Kajfasz, E, Karmanov, D, Kasper, P A, Katsanos, I, Kehoe, R, Kermiche, S, Khalatyan, N, Khanov, A, Kharchilava, A, Kharzheev, Y N, Kohli, J M, Kozelov, A V, Kraus, J, Kulikov, S, Kumar, A, Kupco, A, Kurca, T, Kuzmin, V A, Kvita, J, Lammers, S, Landsberg, G, Lebrun, P, Lee, H S, Lee, S W, Lee, W M, Lellouch, J, Li, L, Li, Q Z, Lietti, S M, Lim, J K, Lincoln, D, Linnemann, J, Lipaev, V V, Lipton, R, Liu, Y, Lobodenko, A, Lokajicek, M, de Sa, R Lopes, Lubatti, H J, Luna-Garcia, R, Lyon, A L, Maciel, A K. A., Mackin, D, Madar, R, Magana-Villalba, R, Malik, S, Malyshev, V L, Maravin, Y, Martinez-Ortega, J, McCarthy, R, McGivern, C L, & Meijer, M M. Evidence for Spin Correlation in t(t)over-bar Production. United States. https://doi.org/10.1103/PhysRevLett.108.032004
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, Besancon, 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-Perez, 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-Thery, S, Cho, D K, Cho, S W, Choi, S, 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, Deliot, F, Demina, R, Denisov, D, Denisov, S P, Desai, S, Deterre, C, DeVaughan, K, Diehl, H T, Diesburg, M, Ding, P F, Dominguez, A, Dorland, T, Dubey, A, Dudko, L V, Duggan, D, Duperrin, A, Dutt, S, Dyshkant, A, Eads, M, Edmunds, D, Ellison, J, Elvira, V D, Enari, Y, Evans, H, Evdokimov, A, Evdokimov, V N, Facini, G, Ferbel, T, Fiedler, F, Filthaut, F, Fisher, W, Fisk, H E, Fortner, M, Fox, H, Fuess, S, Garcia-Bellido, A, Garcia-Guerra, G A, Gavrilov, V, Gay, P, Geng, W, Gerbaudo, D, Gerber, C E, Gershtein, Y, Ginther, G, Golovanov, G, Goussiou, A, Grannis, P D, Greder, S, Greenlee, H, Greenwood, Z D, Gregores, E M, Grenier, G, Gris, Ph, Grivaz, J -F, Grohsjean, A, Gruenendahl, S, Gruenewald, M W, Guillemin, T, Gutierrez, G, Gutierrez, P, Haas, A, Hagopian, S, Haley, J, Han, L, Harder, K, Harel, A, Hauptman, J M, Hays, J, Head, T, Hebbeker, T, Hedin, D, Hegab, H, Heinson, A P, Heintz, U, Hensel, C, la Cruz, I Heredia-De, Herner, K, Hesketh, G, Hildreth, M D, Hirosky, R, Hoang, T, Hobbs, J D, Hoeneisen, B, Hohlfeld, M, Hubacek, Z, Hynek, V, Iashvili, I, Ilchenko, Y, Illingworth, R, Ito, A S, Jabeen, S, Jaffre, M, Jamin, D, Jayasinghe, A, Jesik, R, Johns, K, Johnson, M, Jonckheere, A, Jonsson, P, Joshi, J, Jung, A W, Juste, A, Kaadze, K, Kajfasz, E, Karmanov, D, Kasper, P A, Katsanos, I, Kehoe, R, Kermiche, S, Khalatyan, N, Khanov, A, Kharchilava, A, Kharzheev, Y N, Kohli, J M, Kozelov, A V, Kraus, J, Kulikov, S, Kumar, A, Kupco, A, Kurca, T, Kuzmin, V A, Kvita, J, Lammers, S, Landsberg, G, Lebrun, P, Lee, H S, Lee, S W, Lee, W M, Lellouch, J, Li, L, Li, Q Z, Lietti, S M, Lim, J K, Lincoln, D, Linnemann, J, Lipaev, V V, Lipton, R, Liu, Y, Lobodenko, A, Lokajicek, M, de Sa, R Lopes, Lubatti, H J, Luna-Garcia, R, Lyon, A L, Maciel, A K. A., Mackin, D, Madar, R, Magana-Villalba, R, Malik, S, Malyshev, V L, Maravin, Y, Martinez-Ortega, J, McCarthy, R, McGivern, C L, and Meijer, M M. 2012. "Evidence for Spin Correlation in t(t)over-bar Production". United States. https://doi.org/10.1103/PhysRevLett.108.032004.
@article{osti_1037724,
title = {Evidence for Spin Correlation in t(t)over-bar Production},
author = {Abazov, V M and Abbott, B and Acharya, B S and Adams, M and Adams, T and Alexeev, G D and Alkhazov, G and Alton, A and Alverson, G and Alves, G A and Aoki, M and Askew, A and Asman, B and Atkins, S and Atramentov, O and Augsten, K and Avila, C and BackusMayes, J and Badaud, F and Bagby, L and Baldin, B and Bandurin, D V and Banerjee, S and Barberis, E and Baringer, P and Barreto, J and Bartlett, J F and Bassler, U and Bazterra, V and Bean, A and Begalli, M and Belanger-Champagne, C and Bellantoni, L and Beri, S B and Bernardi, G and Bernhard, R and Bertram, I and Besancon, M and Beuselinck, R and Bezzubov, V A and Bhat, P C and Bhatnagar, V and Blazey, G and Blessing, S and Bloom, K and Boehnlein, A and Boline, D and Boos, E E and Borissov, G and Bose, T and Brandt, A and Brandt, O and Brock, R and Brooijmans, G and Bross, A and Brown, D and Brown, J and Bu, X B and Buehler, M and Buescher, V and Bunichev, V and Burdin, S and Burnett, T H and Buszello, C P and Calpas, B and Camacho-Perez, E and Carrasco-Lizarraga, M A and Casey, B C. K. and Castilla-Valdez, H and Chakrabarti, S and Chakraborty, D and Chan, K M and Chandra, A and Chapon, E and Chen, G and Chevalier-Thery, S and Cho, D K and Cho, S W and Choi, S and Choudhary, B and Cihangir, S and Claes, D and Clutter, J and Cooke, M and Cooper, W E and Corcoran, M and Couderc, F and Cousinou, M -C and Croc, A and Cutts, D and Das, A and Davies, G and De, K and de Jong, S J and De la Cruz-Burelo, E and Deliot, F and Demina, R and Denisov, D and Denisov, S P and Desai, S and Deterre, C and DeVaughan, K and Diehl, H T and Diesburg, M and Ding, P F and Dominguez, A and Dorland, T and Dubey, A and Dudko, L V and Duggan, D and Duperrin, A and Dutt, S and Dyshkant, A and Eads, M and Edmunds, D and Ellison, J and Elvira, V D and Enari, Y and Evans, H and Evdokimov, A and Evdokimov, V N and Facini, G and Ferbel, T and Fiedler, F and Filthaut, F and Fisher, W and Fisk, H E and Fortner, M and Fox, H and Fuess, S and Garcia-Bellido, A and Garcia-Guerra, G A and Gavrilov, V and Gay, P and Geng, W and Gerbaudo, D and Gerber, C E and Gershtein, Y and Ginther, G and Golovanov, G and Goussiou, A and Grannis, P D and Greder, S and Greenlee, H and Greenwood, Z D and Gregores, E M and Grenier, G and Gris, Ph and Grivaz, J -F and Grohsjean, A and Gruenendahl, S and Gruenewald, M W and Guillemin, T and Gutierrez, G and Gutierrez, P and Haas, A and Hagopian, S and Haley, J and Han, L and Harder, K and Harel, A and Hauptman, J M and Hays, J and Head, T and Hebbeker, T and Hedin, D and Hegab, H and Heinson, A P and Heintz, U and Hensel, C and la Cruz, I Heredia-De and Herner, K and Hesketh, G and Hildreth, M D and Hirosky, R and Hoang, T and Hobbs, J D and Hoeneisen, B and Hohlfeld, M and Hubacek, Z and Hynek, V and Iashvili, I and Ilchenko, Y and Illingworth, R and Ito, A S and Jabeen, S and Jaffre, M and Jamin, D and Jayasinghe, A and Jesik, R and Johns, K and Johnson, M and Jonckheere, A and Jonsson, P and Joshi, J and Jung, A W and Juste, A and Kaadze, K and Kajfasz, E and Karmanov, D and Kasper, P A and Katsanos, I and Kehoe, R and Kermiche, S and Khalatyan, N and Khanov, A and Kharchilava, A and Kharzheev, Y N and Kohli, J M and Kozelov, A V and Kraus, J and Kulikov, S and Kumar, A and Kupco, A and Kurca, T and Kuzmin, V A and Kvita, J and Lammers, S and Landsberg, G and Lebrun, P and Lee, H S and Lee, S W and Lee, W M and Lellouch, J and Li, L and Li, Q Z and Lietti, S M and Lim, J K and Lincoln, D and Linnemann, J and Lipaev, V V and Lipton, R and Liu, Y and Lobodenko, A and Lokajicek, M and de Sa, R Lopes and Lubatti, H J and Luna-Garcia, R and Lyon, A L and Maciel, A K. A. and Mackin, D and Madar, R and Magana-Villalba, R and Malik, S and Malyshev, V L and Maravin, Y and Martinez-Ortega, J and McCarthy, R and McGivern, C L and Meijer, M M},
abstractNote = {We present a measurement of the ratio of events with correlated t and {bar t} spins to the total number of t{bar t} events. This ratio f is evaluated using a matrix-element-based approach in 729 t{bar t} candidate events with a single lepton {ell} (electron or muon) and at least four jets. The analyzed p{bar p} collisions data correspond to an integrated luminosity of 5.3 fb{sup -1} and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy {radical}s = 1.96 TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in t{bar t} events with a significance of more than 3 standard deviations.},
doi = {10.1103/PhysRevLett.108.032004},
url = {https://www.osti.gov/biblio/1037724}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 3,
volume = 108,
place = {United States},
year = {Thu Jan 19 00:00:00 EST 2012},
month = {Thu Jan 19 00:00:00 EST 2012}
}

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Top quark spin correlations at the Tevatron and the LHC
journal, May 2011


Measurement of color flow in t t ¯ events from p p ¯ collisions at s = 1.96 TeV
journal, May 2011


Unified approach to the classical statistical analysis of small signals
journal, April 1998


Measuring the running top-quark mass
journal, September 2009


HATHOR – HAdronic Top and Heavy quarks crOss section calculatoR
journal, April 2011


Works referencing / citing this record:

A set of top quark spin correlation and polarization observables for the LHC: Standard Model predictions and new physics contributions
journal, December 2015


Top quark and leptonic charge asymmetries for the Tevatron and LHC
journal, August 2012


Top quark physics at the Tevatron using t t ¯ events
journal, March 2012


Asymmetries in top quark pair production at hadron colliders
journal, May 2015


Top Quark Physics at the lhc: a Review of the First two Years
journal, June 2012


Top Quark Physics, an Experimental Perspective
journal, July 2013


Review of Tevatron results: Top quark physics
journal, February 2015