Observation of transverse polarization asymmetries of charged pion pairs   in e+e- annihilation near sqrt s=10.58 GeV

A. Vossen; R. Seidl; I. Adachi; H. Aihara; T. Aushev; V. Balagura; W.; Bartel; M. Bischofberger; A. Bondar; M. Bra\v{c}ko; T. E. Browder; M.-C.; Chang; A. Chen; P. Chen; B. G. Cheon; K. Cho; Y. Choi; S. Eidelman; M.; Feindt; V. Gaur; N. Gabyshev; A. Garmash; B. Golob; M. Grosse-Perdekamp; J.; Haba; K. Hayasaka; Y. Horii; Y. Hoshi; W.-S. Hou; H. J. Hyun; K. Inami; A.; Ishikawa; M. Iwabuchi; Y. Iwasaki; T. Iwashita; N. J. Joshi; H. Kichimi; H.; O. Kim; M. J. Kim; B. R. Ko; T Kumita; J. S. Lange; M. J. Lee; S.-H. Lee; M.; Leitgab; Y. Li; C. Liu; D. Liventsev; R. Louvot; S. McOnie; H. Miyata; Y.; Miyazaki; R. Mizuk; G. B. Mohanty; E. Nakano; S. Nishida; O. Nitoh; A. Ogawa,; T. Ohshima; S. Okuno; G. Pakhlova; H. Park; H. K. Park; M. Petri\v{c}; L. E.; Piilonen; S. Ryu; H. Sahoo; Y. Sakai; O. Schneider; C. Schwanda; O. Seon; M.; Shapkin; V. Shebalin; T.-A. Shibata; J.-G. Shiu; P. Smerkol; Y.-S. Sohn; E.; Solovieva; S. Stani\v{c}; M. Stari\v{c}; M. Sumihama; T. Sumiyoshi; Y.; Teramoto; M. /Uchida; S. Uehara; T. Uglov; Y. Unno; S. Uno; G. Varner; A.; Vinokurova; C. H. Wang; M.-Z. Wang; P Wang; Y. Watanabe; E. Won; B. D.; Yabsley; Y. Yamashita; V. Zhilich; P. Zhou; V. Zhulanov

arXiv:1104.2425·hep-ex·August 15, 2011

Observation of transverse polarization asymmetries of charged pion pairs in e+e- annihilation near sqrt s=10.58 GeV

A. Vossen, R. Seidl, I. Adachi, H. Aihara, T. Aushev, V. Balagura, W., Bartel, M. Bischofberger, A. Bondar, M. Bra\v{c}ko, T. E. Browder, M.-C., Chang, A. Chen, P. Chen, B. G. Cheon, K. Cho, Y. Choi, S. Eidelman, M., Feindt, V. Gaur, N. Gabyshev, A. Garmash, B. Golob

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TL;DR

This paper reports the measurement of transverse polarization asymmetries in charged pion pairs produced in e+e- collisions, revealing a significant interference fragmentation function near 10.58 GeV.

Contribution

First measurement of nonzero transverse polarization asymmetries of charged pion pairs in e+e- annihilation near 10.58 GeV, indicating a notable interference fragmentation function.

Findings

01

Nonzero azimuthal asymmetries observed for pi+pi- pairs.

02

Evidence of a significant interference fragmentation function.

03

Results based on 672 fb-1 data sample from Belle detector.

Abstract

The interference fragmentation function translates the fragmentation of a quark with a transverse projection of the spin into an azimuthal asymmetry of two final-state hadrons. In e+e- annihilation the product of two interference fragmentation functions is measured. We report nonzero asymmetries for pairs of charge-ordered pi+pi- pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672 fb-1 data sample that contains 711 \times 106 pi+pi- pairs and was collected at and near the ?(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider.

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