Abstract
The clean environment of the e+e- collisions provided by the B-factory PEP-II and the high performances of the BABAR detector allow for precise measurements of the properties of inclusive hadron production. We present recent results obtained using the full data sample of nearly 500 fb-1 on measurements of the inclusive light hadrons momentum spectra, and on anti-deuteron production from decays of bottomonium states, and from continuum e+e- annihilation. We also present a measurement of the azimuthal asymmetries induced by the Collins effect in inclusive production of pion pairs in e+e- → ππX annihilation, where the two pions are produced in opposite hemispheres.
Highlights
A fragmentation function (FF) describes a parton’s hadronization process including non-perturbative effects
Using the Modified Leading Log Approximation (MLLA) with Local PartonHadron Duality (LPHD), we expect that a Gaussian function should proved a good description of the inclusive cross sections when formulated in terms of the variable ξ ≡ − ln xp
Asymmetry dilution effects due to use of the event thrust axis to approximate the qq axis, which has an average divergence of about 100 mrad, are accounted for by using Monte Carlo (MC) studies to determine the average dilution for each z, pt, and θthrust bin which are applied as corrections
Summary
The clean environment of the e+e− collisions provided by the B-factory PEP-II and the high performances of the BABAR detector allow for precise measurements of the properties of inclusive hadron production. We present recent results obtained using the full data sample of nearly 500 fb−1 on measurements of the inclusive light hadrons momentum spectra, and on anti-deuteron production from decays of bottomonium states, and from continuum e+e− annihilation. We present a measurement of the azimuthal asymmetries induced by the Collins effect in inclusive production of pion pairs in e+e− → ππX annihilation, where the two pions are produced in opposite hemispheres. PACS numbers: 12.38.Qk, 13.25.Gv, 13.60.Rj, 13.66.Bc, 13.87.Fh, 13.88.+e, 14.65−q
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