First extraction of interference fragmentation functions from e+e- data

[en] We report on the first extraction of interference fragmentation functions from the semi-inclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the correlation of azimuthal orientations of opposite π+π- pairs is related to the transverse polarization of fragmenting quarks through a significant polarized dihadron fragmentation function. Extraction of the latter requires the knowledge of its unpolarized counterpart, the probability density for a quark to fragment in a π +π - pair. Since data for the unpolarized cross section are missing, we extract the unpolarized dihadron fragmentation function from a Monte Carlo simulation of the cross section. © 2012 American Physical Society.

Disciplines :

Physics

Author, co-author :

Courtoy, Aurore ; Université de Liège - ULiège & INFN Sezione di Pavia, via Bassi 6, I-27100 Pavia, Italy > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules

Bacchetta, A.; INFN Sezione di Pavia, via Bassi 6, I-27100 Pavia, Italy, Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Italy

Radici, M.; INFN Sezione di Pavia, via Bassi 6, I-27100 Pavia, Italy

Bianconi, A.; INFN Sezione di Pavia, via Bassi 6, I-27100 Pavia, Italy, Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, I-25123 Brescia, Italy

Language :

English

Title :

First extraction of interference fragmentation functions from e+e- data

Publication date :

2012

Journal title :

Physical Review. D, Particles, Fields, Gravitation, and Cosmology

ISSN :

1550-7998

eISSN :

1550-2368

Publisher :

American Physical Society, College Park, United States - Maryland

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Available on ORBi :

since 11 July 2012

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