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:
- more »
- 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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