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Measurements of π0π0 production and form factors for f0(980) and f2(1270) in single-tag two-photon process

  • 1.

    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 2.

    School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Funds:  Supported by National Natural Science Foundation of China （11425524）.
Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2016.05.012
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  • Author Bio:

    XU Qingnian, male, born in 1986, PhD candidate. Research field: high energy physics experiment.

  • Received Date: 30 November 2015
  • Accepted Date: 20 April 2016
  • Rev Recd Date: 20 April 2016
  • Publish Date: 31 May 2016
    Abstract

  • Abstract

    A measurement is reported of differential cross section of π0 pair production in single-tag two-photon collisions. These results are obtained with 759 fb-1 of the data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The cross section is measured for Q2 up to 30 GeV2, where Q2 is the negative of the invariant mass squared of the tagged virtual photon, in the kinematic range 05<W<21 GeV and |cos θ*|<10 for the total energy and pion scattering angle, respectively. The transition form factor of the f0(980) and that of the f2(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.

    Abstract

    A measurement is reported of differential cross section of π0 pair production in single-tag two-photon collisions. These results are obtained with 759 fb-1 of the data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The cross section is measured for Q2 up to 30 GeV2, where Q2 is the negative of the invariant mass squared of the tagged virtual photon, in the kinematic range 05<W<21 GeV and |cos θ*|<10 for the total energy and pion scattering angle, respectively. The transition form factor of the f0(980) and that of the f2(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.
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    • References(18)
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    MORI T, UEHARA S, WATANABE Y, et al (Belle Collaboration). High statistics study of the f0(980) resonance in γγ→π+π- production[J]. Phys Rev D, 2007, 75: 051101(R).
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    MORI T, UEHARA S, WATANABE Y, et al (Belle Collaboration). High statistics measurement of the cross sections of γγ→π+π- production[J]. J Phys Soc Jpn, 2007, 76:074102.
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    [1]
    DIEHL M, GOUSSET T, PIRE B, et al. Probing partonic structure in γ*γ → ππ near threshold[J]. Phys Rev Lett, 1998, 81: 1 782-1 785.
    [2]
    DIEHL M, GOUSSET T, PIRE B. Exclusive production of pion pairs in γ*γ collisions at large Q2[J]. Phys Rev D, 2000, 62: 073014.
    [3]
    BRAUN V M, KIVEL N. Hard exclusive production of tensor mesons[J]. Phys Lett B, 2001, 501: 48-53.
    [4]
    COLANGELO G, HOFERICHTER M, PROCURA M, et al. Dispersive approach to hadronic light-by-light scattering[J]. J High Energy Physics, doi: 10.1007/JHEP09(2014)091.
    [5]
    COLANGELO G, HOFERICHTER M, KUBIS B, et al. Towards a data-driven analysis of hadronic light-by-light scattering[J]. Phys Lett B, 2014, 738: 6-12.
    [6]
    ABASHIAN A, GOTOW K, MORGAN N, et al (Belle Collaboration). The Belle detector[J]. Nucl Instr and Meth A, 2002, 479: 117-232.
    [7]
    BRODZICKA J, BROWDER T, CHANG P, et al (Belle Collaboration). Physics achievements from the Belle experiment[J]. Prog Theor Exp Phys, 2012: 04D001.
    [8]
    KUROKAWA S, KIKUTANI E. Overview of the KEKB accelerators[J]. Nucl Instr and Meth A, 2003, 499: 1-7.
    [9]
    ABE T, AKAI K, AKASAKA N, et al. Achievements of KEKB[J]. Prog Theor Exp Phys, 2013: 03A001.
    [10]
    MASUDA M, UEHARA S, WATANABE Y, et al (Belle Collab). Study of π0 pair production in single-tag two-photon collisions[DB/OL]. arXiv:1508.06757.
    [11]
    UEHARA S. TREPS: A Monte-Carlo event generator for two-photon processes at e+e- colliders using an equivalent photon approximation[DB/OL]. arXiv:1310.0157 [hep-ph].
    [12]
    BERGER CH, WAGNER W. Photon photon reactions[J]. Phys Rep, 1987, 146: 1-134.
    [13]
    GINZBURG I F, SHILLER A, SERBO V G. Charge asymmetry of pions in the process e-e+→e-e+π+π-[J]. Eur Phys J C, 2001, 18: 731-746(hep-ph/0012069 LU-2000-24 V. G. Serbo.(private communication)).
    [14]
    MORI T, UEHARA S, WATANABE Y, et al (Belle Collaboration). High statistics study of the f0(980) resonance in γγ→π+π- production[J]. Phys Rev D, 2007, 75: 051101(R).
    [15]
    MORI T, UEHARA S, WATANABE Y, et al (Belle Collaboration). High statistics measurement of the cross sections of γγ→π+π- production[J]. J Phys Soc Jpn, 2007, 76:074102.
    [16]
    UEHARA S, WATANABE Y, ADACHI I, et al (Belle Collaboration). High-statistics measurement of neutral-pion pair production in two-photon collisions[J]. Phys Rev D, 2008, 78: 052004.
    [17]
    SCHULER G A, BERENDS F A, VAN GULIK R. Meson-photon transition form factors and resonance cross-sections in e+e- collisions[J]. Nucl Phys B, 1998, 523: 423-438.
    [18]
    PASCALUTSA V, PAUK V, VANDERHAEGHEN M. Light-by-light scattering sum rules constraining meson transition form factors[J]. Phys Rev D, 2012, 85: 116001.
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