Measurement of azimuthal asymmetries in inclusive production of hadron pairs in e(+)e(-) annihilation at Belle

The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs...

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Veröffentlicht in:	Physical review letters 2006-06, Vol.96 (23), p.232002, Article 232002
Hauptverfasser:	Seidl, R, Hasuko, K, Abe, K, Adachi, I, Aihara, H, Anipko, D, Asano, Y, Aushev, T, Bakich, A M, Balagura, V, Barberio, E, Bartel, W, Bay, A, Bitenc, U, Bizjak, I, Blyth, S, Bozek, A, Bracko, M, Browder, T E, Chang, P, Chen, A, Cheon, B G, Choi, Y, Choi, Y K, Chuvikov, A, Dalseno, J, Danilov, M, Dash, M, Dragic, J, Eidelman, S, Fratina, S, Gabyshev, N, Gershon, T, Go, A, Gokhroo, G, Golob, B, Gorisek, A, Grosse Perdekamp, M, Ha, H C, Hayasaka, K, Hayashii, H, Hazumi, M, Hokuue, T, Hoshi, Y, Hou, S, Hou, W-S, Iijima, T, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Kang, J H, Kapusta, P, Katayama, N, Kawai, H, Kawasaki, T, Khan, H R, Kichimi, H, Kim, S K, Kim, S M, Kulasiri, R, Kumar, R, Kuo, C C, Kuzmin, A, Kwon, Y-J, Lange, J S, Lee, J, Lesiak, T, Li, J, Limosani, A, Lin, S-W, Liventsev, D, Mandl, F, Matsumoto, T, Matyja, A, Mitaroff, W, Miyake, H, Miyata, H, Miyazaki, Y, Mizuk, R, Mori, T, Nakamura, I, Nakano, E, Nakao, M, Natkaniec, Z, Nishida, S, Nitoh, O, Ogawa, A, Ogawa, S, Ohshima, T, Okabe, T, Okuno, S, Olsen, S L, Ozaki, H, Pakhlov, P, Palka, H, Park, C W, Park, H, Parslow, N
Format:	Artikel
Sprache:	eng
Schlagworte:	ANNIHILATION ASYMMETRY ELECTRON-POSITRON INTERACTIONS ELECTRONS GEV RANGE 10-100 MASS PAIR PRODUCTION PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS MINUS PIONS PLUS POLARIZATION POSITRONS QUARKS SPIN VECTORS
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Beschreibung
Zusammenfassung:	The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs in e(+)e(-) annihilation at a center-of-mass energy of 10.52 GeV, which can be attributed to a transverse polarization of the primordial quarks. The measurement was performed using a sample of 79 x 10(6) hadronic events collected with the Belle detector.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.96.232002