First extraction of Interference Fragmentation Functions from $e^+e^-$ data - INSPIRE

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First extraction of Interference Fragmentation Functions from $e^+e^-$ data

Aurore Courtoy
(
- INFN, Pavia and
- Liege U.
)
,
Alessandro Bacchetta
(
- INFN, Pavia and
- Pavia U.
)
,
Marco Radici
(
- INFN, Pavia
)
,
Andrea Bianconi
(
- Brescia U. and
- INFN, Brescia and
- INFN, Pavia
)

Feb, 2012

17 pages

Published in:

Phys.Rev.D 85 (2012) 114023

e-Print:

1202.0323 [hep-ph]

DOI:

10.1103/PhysRevD.85.114023

View in:

ADS Abstract Service

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Abstract: (arXiv)

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 \pi+\pi- 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 \pi+\pi- 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.

Note:

17 pages, 7 (multiple) figures, 15 tables, RevTeX format; refined version of the fit, conclusions unchanged; added reference

13.87.Fh
14.65.Dw
13.66.Bc
14.65.Bt
fragmentation function: interference
dihadron: fragmentation function
polarization: transverse
electron: annihilation
hadron: pair production
numerical calculations: Monte Carlo

References(37)

Figures(20)

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