Asymmetries in the production of Lambda(+)(c) and Lambda(-)(c) baryons in 500 GeV/c pi(-) nucleon interactions

Citation
Em. Aitala et al., Asymmetries in the production of Lambda(+)(c) and Lambda(-)(c) baryons in 500 GeV/c pi(-) nucleon interactions, PHYS LETT B, 495(1-2), 2000, pp. 42-48
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
495
Issue
1-2
Year of publication
2000
Pages
42 - 48
Database
ISI
SICI code
0370-2693(200012)495:1-2<42:AITPOL>2.0.ZU;2-E
Abstract
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, wit h an asymmetry of (12.7 +/- 3.4 +/- 1.3)% independent of x(F) and p(T)(2) i n 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 (Ge V/c)(2)). This Lambda (c) asymmetry measurement is the first with data in b oth the positive and negative x(F) regions. (C) 2000 Elsevier Science B.V. All rights reserved.