Measurement of Collins Asymmetries in Inclusive Production of Charged Pion Pairs in e⁺e⁻ Annihilation at BaBar

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Measurement of Collins Asymmetries in Inclusive Production of Charged Pion Pairs in e⁺e⁻ Annihilation at BaBar

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Title: Measurement of Collins Asymmetries in Inclusive Production of Charged Pion Pairs in e⁺e⁻ Annihilation at BaBar
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Stugu, B.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2014-09-09
Format: Text
Item Type: Article
Keywords: Show Keywords
Abstract: We present measurements of Collins asymmetries in the inclusive process e⁺e⁻ → ππX, where π stands for charged pions, at a center-of-mass energy of 10.6 GeV. We use a data sample of 468 fb⁻¹ collected by the BABAR experiment at the PEP-II B factory at SLAC, and consider pairs of charged pions produced in opposite hemispheres of hadronic events. We observe clear asymmetries in the distributions of the azimuthal angles in two distinct reference frames. We study the dependence of the asymmetry on several kinematic variables, finding that it increases with increasing pion momentum and momentum transverse to the analysis axis, and with increasing angle between the thrust and beam axis.
Publisher: American Physical Society
ISSN: 1550-7998
Source: Physical Review D
Link to Related Resource: http://dx.doi.org/ 10.1103/PhysRevD.90.052003
Persistent Link: http://hdl.handle.net/10735.1/4282
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2014. "Measurement of Collins asymmetries in inclusive production of charged pion pairs in e⁺e⁻ annihilation at BABAR." Physical Review D 90(5), doi:10.1103/PhysRevD.90.052003
Terms of Use: ©2014 American Physical Society

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