Spin correlation in t(t)over-bar production from p(p)over-bar collisions at √s=1.8 TeV

被引：37

作者：

Abbott, B ^{[1
]}

Abramov, MAV

Abolins, M

Abramov, V

Acharya, BS

Adams, DL

Adams, M

Akimov, V

Alves, GA

Amos, N

Anderson, EW

Baarmand, MM

Babintsev, VV

Babukhadia, L

Baden, A

Baldin, B

Banerjee, S

Bantly, J

Barberis, E

Baringer, P

Bartlett, JF

Bassler, U

Bean, A

Belyaev, A

Beri, SB

Bernardi, G

Bertram, I

Bezzubov, VA

Bhat, PC

Bhatnagar, V

Bhattacharjee, M

Blazey, G

Blessing, S

Boehnlein, A

Bojko, NI

Borcherding, F

Brandt, A

Breedon, R

Briskin, G

Brock, R

Brooijmans, G

Bross, A

Buchholz, D

Bueschre, V

Burtovoi, VS

Butler, JM

Carvalho, W

Casey, D

Casilum, Z

Castilla-Valdez, H

机构：

[1] NYU, New York, NY 10003 USA

[2] Univ Buenos Aires, Buenos Aires, DF, Argentina

[3] Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil

[4] Univ Estado Ri de Janeiro, Rio De Janeiro, Brazil

[5] Inst High Energy Phys, Beijing 100039, Peoples R China

[6] Univ Los Andes, Bogota, Colombia

[7] Univ San Francisco Quito, Quito, Ecuador

[8] Univ Grenoble 1, CNRS, IN2P3, Inst Nucl Sci, Grenoble, France

[9] Univ Aix Marseille 2, CNRS, IN2P3, CPPM, Marseille, France

[10] Univ Paris 06, LPHNE, Paris, France

[11] Univ Paris 07, CNRS, IN2P3, Paris, France

[12] CEA, Serv Phys Particules, DAPNIA, Saclay, France

[13] Panjab Univ, Chandigarh 160014, India

[14] Univ Delhi, Delhi 110007, India

[15] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[16] Seoul Natl Univ, Seoul, South Korea

[17] CINVESTAV, Mexico City 14000, DF, Mexico

[18] Inst Nucl Phys, Krakow, Poland

[19] Inst Theoret & Expt Phys, Moscow 117259, Russia

[20] Moscow MV Lomonosov State Univ, Moscow, Russia

[21] Inst High Energy Phys, Protvino, Russia

[22] Univ Lancaster, Lancaster, England

[23] Univ Arizona, Tucson, AZ 85721 USA

[24] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[25] Univ Calif Berkeley, Berkeley, CA 94720 USA

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

[27] Calif State Univ Fresno, Fresno, CA 93740 USA

[28] Univ Calif Irvine, Irvine, CA 92697 USA

[29] Univ Calif Riverside, Riverside, CA 92521 USA

[30] Florida State Univ, Tallahassee, FL 32306 USA

[31] Univ Hawaii, Honolulu, HI 96822 USA

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

[33] Univ Illinois, Chicago, IL 60607 USA

[34] No Illinois Univ, De Kalb, IL 60115 USA

[35] Northwestern Univ, Evanston, IL 60208 USA

[36] Indiana Univ, Bloomington, IN 47405 USA

[37] Univ Notre Dame, Notre Dame, IN 46556 USA

[38] Iowa State Univ, Ames, IA 50011 USA

[39] Univ Kansas, Lawrence, KS 66045 USA

[40] Kansas State Univ, Manhattan, KS 66506 USA

[41] Louisiana Tech Univ, Ruston, LA 71272 USA

[42] Univ Maryland, College Pk, MD 20742 USA

[43] Boston Univ, Boston, MA 02215 USA

[44] Northeastern Univ, Boston, MA 02115 USA

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

[46] Michigan State Univ, E Lansing, MI 48824 USA

[47] Univ Nebraska, Lincoln, NE 68588 USA

[48] Columbia Univ, New York, NY 10027 USA

[49] Univ Rochester, Rochester, NY 14627 USA

[50] SUNY Stony Brook, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.85.256

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The D0 collaboration has performed a study of spin correlation in t (t) over tilde production for the process t (t) over bar --> bW(+)(b) over bar W-, where the W bosons decay to e nu or mu nu. A sample of six events was collected during an exposure of the DO detector to an integrated luminosity of approximately 125 pb(-1) of root s = 1.8 TeV p (p) over bar collisions. The standard model (SM) predicts that the short lifetime of the top quark ensures the transmission of any spin information at production to the t (t) over bar decay products. The degree of spin correlation is characterized by a correlation coefficient kappa. We find that kappa > -0.25 at the 68% confidence level. in agreement with the SM prediction of kappa = 0.88.

引用

页码：256 / 261

页数：6

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