Measurement of Collins asymmetries in inclusive production of charged pion pairs in e^+e^− annihilation at BABAR
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.
Additional Information
© 2014 American Physical Society. Received 24 September 2013; published 9 September 2014. The authors would like to thank Ralf Seidl of the Belle Collaboration for fruitful discussions on the analysis method. We are also grateful to Mauro Anselmino and Marco Contalbrigo, for helpful discussions on the theoretical aspects of the measurement. We are grateful for the extraordinary contributions of our PEP-II2 colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).Attached Files
Published - PhysRevD.90.052003.pdf
Submitted - 1309.5278v2.pdf
Files
1309.5278v2.pdf
Additional details
Identifiers
- Eprint ID
- 52323
- Resolver ID
- CaltechAUTHORS:20141203-104924907
Related works
- Describes
- http://arxiv.org/abs/1309.5278 (URL)
Funding
- Department of Energy (DOE)
- NSF
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Commissariat à l'Energie Atomique (CEA)
- Bundesministerium für Bildung und Forschung (BMBF)
- Istituto Nazionale di Fisica Nucleare (INFN)
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Research Council of Norway
- Ministry of Education and Science of the Russian Federation
- Science and Technology Facilities Council (STFC)
- Marie Curie Fellowship
- Alfred P. Sloan Foundation
- Deutsche Forschungsgemeinschaft (DFG)
- Ministerio de Economía y Competitividad (MINECO)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
Dates
- Created
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2014-12-03Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field