Asymmetries in the production of Λc+ and Λc- baryons in 500 GeV/c π- nucleon interactions

被引：28

作者：

Aitala, EM

Amato, S

Anjos, JC

Appel, JA

Ashery, D

Banerjee, S

Bediaga, I

Blaylock, G

Bracker, SB

Burchat, PR

Burnstein, RA

Carter, T

Carvalho, HS

Copty, NK

Cremaldi, LM

Darling, C

Denisenko, K

Devmal, S

Fernandez, A

Fox, GF

Gagnon, P

Gobel, C

Gounder, K

Halling, AM

Herrera, G

Hurvits, G

James, C

Kasper, PA

Kwan, S

Langs, DC

Leslie, J

Lundberg, B

Magnin, J ^{[1
]}

MayTal-Beck, S

Meadows, B

Neto, JRTD

Mihalcea, D

Milburn, RH

de Miranda, JM

Napier, A

Nguyen, A

d'Oliveira, AB

O'Shaughnessy, K

Peng, KC

Perera, LP

Purohit, MV

Quinn, B

Radeztsky, S

Rafatian, A

Reay, NW

机构：

[1] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[2] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[3] Univ Cincinnati, Cincinnati, OH 45221 USA

[4] CINVESTAV, Mexico City 07000, DF, Mexico

[5] Fermi Natl Accelerator Lab, Batavia, IL 60510 USA

[6] IIT, Chicago, IL 60616 USA

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

[8] Univ Massachusetts, Amherst, MA 01003 USA

[9] Univ Mississippi, University, MS 38677 USA

[10] Princeton Univ, Princeton, NJ 08544 USA

[11] Univ Autonoma Puebla, Mexico City, DF, Mexico

[12] Univ S Carolina, Columbia, SC 29208 USA

[13] Stanford Univ, Stanford, CA 94305 USA

[14] Tel Aviv Univ, IL-69978 Tel Aviv, Israel

[15] Tufts Univ, Medford, MA 02155 USA

[16] Univ Wisconsin, Madison, WI 53706 USA

[17] Yale Univ, New Haven, CT 06511 USA

来源：

PHYSICS LETTERS B | 2000年 / 495卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(00)01239-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of asymmetries in the production of Lambda (+)(c) and Lambda (-)(c) baryons in 500 GeV/c pi (-)-nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x (x(F)) and transverse momentum squared (p(T)(2)) using a sample of 1819 +/- 62 Lambda (c)'s observed in the decay channel Lambda (+)(c) --> pK(-)pi (+). We observe more Lambda (+)(c) than Lambda (-)(c) baryons, with an asymmetry of (12.7 +/- 3.4 +/- 1.3)% independent of x(F) and p(T)(2) in our kinematical range (-0.1 less than or equal to x(F) less than or equal to 0.6 and 0.0 less than or equal to p(T)(2) less than or equal to 8.0 (GeV/c)(2)). This Lambda (c) asymmetry measurement is the first with data in both the positive and negative x(F) regions. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：42 / 48

页数：7

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