Measurement of the forward-backward asymmetry of Λ and Λ¯ production in pp¯ collisions

0470480 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš - Royon, C. … celkem 368 autorů
Measurement of the forward-backward asymmetry of Λ and Λ¯ production in pp¯ collisions.
Physical Review D. Roč. 93, č. 3 (2016), 1-10, č. článku 032002. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT(CZ) LG15047; GA MŠMT LM2015068
Institucionální podpora: RVO:68378271
Klíčová slova: Batavia TEVATRON Coll * DZERO * anti-p p: scattering * experimental results * 1960 GeV-cms
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.557, rok: 2016

We study Λ and Λ¯ production asymmetries in pp¯→Λ(Λ¯)X, pp¯→J/ψΛ(Λ¯)X, and pp¯→μ±Λ(Λ¯)X events recorded by the D0 detector at the Fermilab Tevatron collider at s=1.96  TeV. We find an excess of Λ’s (Λ¯’s) produced in the proton (antiproton) direction. This forward-backward asymmetry is measured as a function of rapidity. We confirm that the Λ¯/Λ production ratio, measured by several experiments with various targets and a wide range of energies, is a universal function of “rapidity loss,” i.e., the rapidity difference of the beam proton and the lambda.

Trvalý link: http://hdl.handle.net/11104/0268106