Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e{sup +}e{sup -} Annihilation at Belle

Journal Article · Fri Jun 16 00:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.232002· OSTI ID:20775277

Seidl, R; Hasuko, K; Grosse Perdekamp, M; Ogawa, A ^[1]; Abe, K; Hoshi, Y ^[2]; Adachi, I; Dragic, J; Gershon, T; Hazumi, M; Ishikawa, A; Itoh, R; Iwasaki, Y; Katayama, N; Kichimi, H; Limosani, A; Nakamura, I; Nakao, M; Nishida, S; Ozaki, H ^[3]

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1. RIKEN BNL Research Center, Upton, New York 11973 (United States)
2. Tohoku Gakuin University, Tagajo (Japan)
3. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

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{sup +}e{sup -} 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 79x10{sup 6} hadronic events collected with the Belle detector.

• OSTI ID: 20775277
• Journal Information: Physical Review Letters, Vol. 96, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.96.232002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ASYMMETRY
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
GEV RANGE 10-100
MASS
PAIR PRODUCTION
PIONS MINUS
PIONS PLUS
POLARIZATION
POSITRONS
QUARKS
SPIN
VECTORS