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γγ physics and transition form factor measurements at KLOE＼KLOE-2

  • Dipartimento di Fisica, Universit La Sapienza e INFN, Sezione di Roma, Rome I-00185, Italy

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https://doi.org/10.3969/j.issn.0253-2778.2016.05.011
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  • Author Bio:

    GAUZZI P., male, born in 1963, PhD. Research field: high energy physics. E-mail: paolo.gauzzi@roma1.infn.it

  • Received Date: 27 November 2015
  • Accepted Date: 20 April 2016
  • Rev Recd Date: 20 April 2016
  • Publish Date: 31 May 2016
    Abstract

  • Abstract

    The KLOE results on the measurement of the transition form factors of the η and π0 mesons in  Dalitz decays are presented, and the determination of the Γ(η→γγ) in γγ collisions is also reported. The prospects for γγ physics of the new data-taking, started in November 2014 with the upgraded detector, are reviewed.

    Abstract

    The KLOE results on the measurement of the transition form factors of the η and π0 mesons in  Dalitz decays are presented, and the determination of the Γ(η→γγ) in γγ collisions is also reported. The prospects for γγ physics of the new data-taking, started in November 2014 with the upgraded detector, are reviewed.
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    • References(23)
  • [1]
    AMELINO-CAMELIA G, ARCHILLI F, BABUSCI D, et al. Physics with the KLOE-2 experiment at the upgraded DAΦNE[J]. Eur Phys J C, 2010, 68: 619-681.
    [2]
    JEGERLEHNER F, NYFFELER A. The muon g-2[J]. Phys Rept, 2009, 477: 1-110.
    [3]
    COLANGELO G, HOFERICHTER M, PROCURA M, et al. Dispersion relation for hadronic light-by-light scattering: theoretical foundations[J]. JHEP, 2015, 09: 074.
    [4]
    BALLA A, BENCIVENNI G, BRANCHINI P, et al. The cylindrical GEM detector for the KLOE-2 Inner Tracker[J]. JINST, 2014, 9: C01014
    [5]
    CORDELLI M, DANè E, GIOVANNELLA S, et al. CCALT: A crystal CALorimeter with timing for the KLOE-2 upgrade[J]. Nucl Instrum Meth A, 2013, 718: 81-82.
    [6]
    CORDELLI M, CORRADI G, HAPPACHER F, et al. QCALT: A tile calorimeter for KLOE-2 experiment[J]. Nucl Instrum Meth A, 2010, 617: 105-106.
    [7]
    BABUSCI D, BINI C, CIAMBRONE P, et al. The low energy tagger for the KLOE-2 experiment[J]. Nucl Instrum Meth A, 2010, 617: 81-84.
    [8]
    ARCHILLI F, BABUSCI D, BADONI D, et al. Gamma-gamma tagging system for KLOE2 experiment[J]. Nucl Instrum Meth A, 2010, 617: 266-268.
    [9]
    BABUSCI D, BADONI D, BALWIERZ-PYTKO I, et al (KLOE-2 Collaboration). Measurement of η meson production in γγ interactions and Γ(η→γγ) with the KLOE detector[J]. JHEP, 2013, 01: 119.
    [10]
    KAMPF K, MOUSSALLAM B. Chiral expansions of the π0 lifetime[J]. Phys Rev D, 2009,79: 076005.
    [11]
    LARIN I, MCNULTY D, CLINTON E, et al (PrimEx). New measurement of the π0 radiative decay width[J]. Phys Rev Lett, 2011, 106: 162303.
    [12]
    URAS A (for the NA60 Collaboration). Measurement of the η and ω Dalitz decays transition form factors in p-A collisions at 400 GeV/c with the NA60 apparatus[J]. J Phys Conf Ser, 2011, 270: 012038.
    [13]
    BERGHUSER H, METAG V, STAROSTIN A, et al. Determination of the η-transition form factor in the γp→pη→pγe+e-γp→pη→pγe+e- reaction[J]. Phys Lett B, 2011, 701: 562-567.
    [14]
    AGUAR-BARTOLOME P, ANNAND J R M, Arends H J, et al (A2 Collaboration). New determination of the η transition form factor in the Dalitz decay η→e+e-γ with the Crystal Ball/TAPS detectors at the Mainz Microtron[J]. Phys Rev C, 2014, 89: 044608.
    [15]
    TERSCHLSEN C, LEUPOLD S. Electromagnetic transition form factors of mesons[J]. Prog Part Nucl Phys, 2012, 67: 401-405.
    [16]
    SCHNEIDER S P, KUBIS B, NIECKNIG F. ω→π0γ* and →π0γ* transition form factors in dispersion theory[J]. Phys Rev D, 2012, 86: 054013.
    [17]
    IVASHYN S. Vector to pseudoscalar meson radiative transitions in chiral theory with resonances[J]. Prob Atomic Sci Technol, 2012, N1: 179-182
    [18]
    ACHASOV M N, AULCHENKO V M, BELOBORODOV K I, et al. Study of conversion decays →ηe+e- and η→γe+e- in the experiment with SND detector at VEPP-2M collider[J]. Phys Lett B, 2001, 504: 275-281.
    [19]
    BABUSCI D, BALWIERZ-PYTKO I, BENCIVENNI G, et al. (KLOE-2) Study of the Dalitz decay →ηe+e- with the KLOE detector[J]. Phys Lett B, 2015: 742: 1-6.
    [20]
    LANDSBERG L. Electromagnetic decays of light mesons[J]. Phys Rept, 1985, 128: 301-376.
    [21]
    AKHMETSHIN R R, ANASHKIN E V, ARPAGAUS M, et al (CMD-2). Observation of the conversion decay →π0e+e- at CMD-2[J]. Phys Lett B, 2001, 503: 237-244.
    [22]
    ACHASOV M N, BELOBORODOV K I, BERDYUGIN A V, et al. Measurement of the  → π0e+e- decay probability[J]. JETP Lett, 2002, 75: 449-451(Pisma Zh Eksp Teor Fiz, 2002, 75: 539-541).
    [23]
    DANILKIN I V, FERNANDEZ-RAMIREZ C, GUO P, et al. Dispersive analysis of ω/→3π,πγ[J]. Phys Rev D, 2015, 91: 094029.
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    [1]
    AMELINO-CAMELIA G, ARCHILLI F, BABUSCI D, et al. Physics with the KLOE-2 experiment at the upgraded DAΦNE[J]. Eur Phys J C, 2010, 68: 619-681.
    [2]
    JEGERLEHNER F, NYFFELER A. The muon g-2[J]. Phys Rept, 2009, 477: 1-110.
    [3]
    COLANGELO G, HOFERICHTER M, PROCURA M, et al. Dispersion relation for hadronic light-by-light scattering: theoretical foundations[J]. JHEP, 2015, 09: 074.
    [4]
    BALLA A, BENCIVENNI G, BRANCHINI P, et al. The cylindrical GEM detector for the KLOE-2 Inner Tracker[J]. JINST, 2014, 9: C01014
    [5]
    CORDELLI M, DANè E, GIOVANNELLA S, et al. CCALT: A crystal CALorimeter with timing for the KLOE-2 upgrade[J]. Nucl Instrum Meth A, 2013, 718: 81-82.
    [6]
    CORDELLI M, CORRADI G, HAPPACHER F, et al. QCALT: A tile calorimeter for KLOE-2 experiment[J]. Nucl Instrum Meth A, 2010, 617: 105-106.
    [7]
    BABUSCI D, BINI C, CIAMBRONE P, et al. The low energy tagger for the KLOE-2 experiment[J]. Nucl Instrum Meth A, 2010, 617: 81-84.
    [8]
    ARCHILLI F, BABUSCI D, BADONI D, et al. Gamma-gamma tagging system for KLOE2 experiment[J]. Nucl Instrum Meth A, 2010, 617: 266-268.
    [9]
    BABUSCI D, BADONI D, BALWIERZ-PYTKO I, et al (KLOE-2 Collaboration). Measurement of η meson production in γγ interactions and Γ(η→γγ) with the KLOE detector[J]. JHEP, 2013, 01: 119.
    [10]
    KAMPF K, MOUSSALLAM B. Chiral expansions of the π0 lifetime[J]. Phys Rev D, 2009,79: 076005.
    [11]
    LARIN I, MCNULTY D, CLINTON E, et al (PrimEx). New measurement of the π0 radiative decay width[J]. Phys Rev Lett, 2011, 106: 162303.
    [12]
    URAS A (for the NA60 Collaboration). Measurement of the η and ω Dalitz decays transition form factors in p-A collisions at 400 GeV/c with the NA60 apparatus[J]. J Phys Conf Ser, 2011, 270: 012038.
    [13]
    BERGHUSER H, METAG V, STAROSTIN A, et al. Determination of the η-transition form factor in the γp→pη→pγe+e-γp→pη→pγe+e- reaction[J]. Phys Lett B, 2011, 701: 562-567.
    [14]
    AGUAR-BARTOLOME P, ANNAND J R M, Arends H J, et al (A2 Collaboration). New determination of the η transition form factor in the Dalitz decay η→e+e-γ with the Crystal Ball/TAPS detectors at the Mainz Microtron[J]. Phys Rev C, 2014, 89: 044608.
    [15]
    TERSCHLSEN C, LEUPOLD S. Electromagnetic transition form factors of mesons[J]. Prog Part Nucl Phys, 2012, 67: 401-405.
    [16]
    SCHNEIDER S P, KUBIS B, NIECKNIG F. ω→π0γ* and →π0γ* transition form factors in dispersion theory[J]. Phys Rev D, 2012, 86: 054013.
    [17]
    IVASHYN S. Vector to pseudoscalar meson radiative transitions in chiral theory with resonances[J]. Prob Atomic Sci Technol, 2012, N1: 179-182
    [18]
    ACHASOV M N, AULCHENKO V M, BELOBORODOV K I, et al. Study of conversion decays →ηe+e- and η→γe+e- in the experiment with SND detector at VEPP-2M collider[J]. Phys Lett B, 2001, 504: 275-281.
    [19]
    BABUSCI D, BALWIERZ-PYTKO I, BENCIVENNI G, et al. (KLOE-2) Study of the Dalitz decay →ηe+e- with the KLOE detector[J]. Phys Lett B, 2015: 742: 1-6.
    [20]
    LANDSBERG L. Electromagnetic decays of light mesons[J]. Phys Rept, 1985, 128: 301-376.
    [21]
    AKHMETSHIN R R, ANASHKIN E V, ARPAGAUS M, et al (CMD-2). Observation of the conversion decay →π0e+e- at CMD-2[J]. Phys Lett B, 2001, 503: 237-244.
    [22]
    ACHASOV M N, BELOBORODOV K I, BERDYUGIN A V, et al. Measurement of the  → π0e+e- decay probability[J]. JETP Lett, 2002, 75: 449-451(Pisma Zh Eksp Teor Fiz, 2002, 75: 539-541).
    [23]
    DANILKIN I V, FERNANDEZ-RAMIREZ C, GUO P, et al. Dispersive analysis of ω/→3π,πγ[J]. Phys Rev D, 2015, 91: 094029.
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