Chinese Physics C > 2008, Vol. 32 > Issue(6): 499-503 DOI: 10.1088/1674-1137/32/6/019

Study of ππ production in two-photon collisions at Belle

S.Uehara (for the Belle Collaboration)

IPNS-KEK; Institute of Particle and Nuclear Studies; High Energy Accelerator Research Organization; Tsukuba; Japan

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Abstract：

We have measured the cross section for π⁺π^－production in two-photon collisions using a data sample with an integrated luminosity of 85.9fb^－1collected with the Belle detector. The f₀(980) resonance is observed as a peak in the energy spectrum of the cross section. We also report preliminary results for γγ→π⁰π⁰with two-photon center-of-mass energies ranging from 0.6 to 4.0GeV, based on a 95fb^－1data sample. We find at least four resonant structures including a peak from f₀(980). In addition, there is evidence for χ_c0production. We also make a preliminary discussion of the angular dependence and cross section ratio of γγ→π⁺π^－and γγ→π⁰π⁰.

References

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. Uehara S. Proceedings of Photon2007,International Conference on the Structure and Interactions of the Photonincluding the 17th International Workshop on Photon-Photon Collisions and the International Workshop on High Energy Photon Linear Colliders. Paris, 9-13 July 2007, to be published in Nucl. Phys. B (Proc. Suppl.).2. Brodsky S J, Lepage G P. Phys. Rev. D, 1981, 24: 18083. Benayoun M, Chernyak V L. Nucl. Phys. B, 1990, 329:209; Chernyak V L. Phys. Lett. B, 2006, 640: 2464. Diehl M, Kroll P, Vogt C. Phys. Lett. B, 2002, 532: 995. Belle Collaboration, Mori T et al. J. Phys. Soc. Jpn., 2007,76: 074102; Belle Collaboration, Mori T et al. Phys. Rev.D, 2007, 75: 051101(R)6. Belle Collaboration, Abe K et al. BELLE-CONF-0768,arXiv.0711.1926, 20077. JADE Collaboration, Oest T et al. Zeit. Phys. C, 1990, 47:3438. Crystal Ball Collaboration, Marsiske H et al. Phys. Rev.D, 1990, 41: 33249. Belle Collaboration, Abashian A et al. Nucl. Instrum.Methods A, 2002, 479: 11710. Kurokawa S, Kikutani E. Nucl. Instrum. Methods A, 2003,499: 1 and other papers included in this volume.11. Belle Collaboration, Nakazawa H et al. Phys. Lett. B, 2005,615: 3912. Particle Data Group, Yao W-M et al. J. Phys. G, 2006, 33:1

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S.Uehara (for the Belle Collaboration). Study of ππ production in two-photon collisions at Belle[J]. Chinese Physics C, 2008, 32(6): 499-503. doi: 10.1088/1674-1137/32/6/019

S.Uehara (for the Belle Collaboration). Study of ππ production in two-photon collisions at Belle[J]. Chinese Physics C, 2008, 32(6): 499-503. doi:10.1088/1674-1137/32/6/019 shu

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Received: 2008-01-17
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of ππ production in two-photon collisions at Belle

S.Uehara (for the Belle Collaboration)

IPNS-KEK; Institute of Particle and Nuclear Studies; High Energy Accelerator Research Organization; Tsukuba; Japan

Received Date:2008-01-17
Accepted Date:1900-01-01
Available Online:2008-06-05

Abstract:

We have measured the cross section for π⁺π^－production in two-photon collisions using a data sample with an integrated luminosity of 85.9fb^－1collected with the Belle detector. The f₀(980) resonance is observed as a peak in the energy spectrum of the cross section. We also report preliminary results for γγ→π⁰π⁰with two-photon center-of-mass energies ranging from 0.6 to 4.0GeV, based on a 95fb^－1data sample. We find at least four resonant structures including a peak from f₀(980). In addition, there is evidence for χ_c0production. We also make a preliminary discussion of the angular dependence and cross section ratio of γγ→π⁺π^－and γγ→π⁰π⁰.