Photoproduction of neutral pions in the region of the fourth nucleon resonance

Althoff, K.H.; Gies, M.; Kaul, O.; Königsmann, K.; Menze, D.; Meyer, W.; Miczaika, T.; Roderburg, E.; Schwille, W. J.

doi:10.1007/bf01440225

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…Experimental information on the recations γγ → hadrons is accessible in e + e − collisions via the reaction e + + e − → e + + e − + hadrons [26,27,28,29,30,31,32]. Recently high-statistics data have been reported by the Belle Collaboration [33,34,35,36], including the first measurement of ηη production.…”

Section: Introductionmentioning

confidence: 99%

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Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons

et al. 2013

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We study the reactions γγ → π 0 π 0 , π + π − , K 0K 0 , K + K − , η η and π 0 η based on a chiral Lagrangian with dynamical light vector mesons as formulated within the hadrogenesis conjecture. At present our chiral Lagrangian contains 5 unknown parameters that are relevant for the photon fusion reactions. They parameterize the strength of interaction terms involving two vector meson fields. These parameters are fitted to photon fusion data γγ → π 0 π 0 , π + π − , π 0 η and to the decay η → π 0 γγ. In order to derive gauge invariant reaction amplitudes in the resonance region constraints from maximal analyticity and exac t coupled-channel unitarity are used. Our results are in good agreement with the existing experimental data from threshold up to about 0.9 GeV for the two-pion final states. The a 0 meson in the π 0 η channel is dynamically generated and an accurate reproduction of the γγ → π 0 η data is achieved up to 1.2 GeV. Based on our parameter sets we predict the γγ → K 0K 0 , K + K − , η η cross sections.

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Section: Introductionmentioning

confidence: 99%

“…For the charged-kaon case a pure Born-term calculation (onekaon exchange) is shown by the dotted curve. The data are taken from[30,31,32,36].…”

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confidence: 99%

Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons

et al. 2013

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“…Cross section data for π 0 photoproduction were obtained and studied at many different laboratories over a wide kinematic range [2][3][4][6][7][8][9][10][11][12][13][14][15][16][17][18]. A review of the main data sets published before 2005 and a corresponding comparison of their coverage in energy and solid angle can be found in Ref.…”

Section: Previous Resultsmentioning

confidence: 99%

“…The results are in good overall agreement with previous measurements of this reaction but are underestimated by the models at very forward angles for large photon energies. The Bonn-Gatchina PWA found the N (2190)G 17 , N (2080)D 13 , and N (2070)D 15 high-mass resonances in its description of the data.…”

Section: Discussionmentioning

confidence: 99%

Photoproduction of neutral pions off protons

Credé¹,

Sparks²,

Wilson³

et al. 2011

Phys. Rev. C

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“…6), and the unacceptable fit without the f 4 (2050) ( Table V) strongly supports a finite two-photon coupling. In the past, TASSO and JADE have set 95% confidence upper limits for the f 4 (2050) to be Γ γγ B(KK) < 0.29 keV [18] and Γ γγ B(ππ) < 1.1 keV [19], respectively. These can be translated into upper limits for the two-photon widths of 43 and 6.5 keV, respectively.…”

Section: −22 +415mentioning

confidence: 99%

High-statistics study of neutral-pion pair production in two-photon collisions

Uehara¹,

Watanabe

Nakazawa

et al. 2009

Phys. Rev. D

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The differential cross sections for the process ! 0 0 have been measured in the kinematic range 0:6 GeV < W < 4:1 GeV, j cos Ã j < 0:8 in energy and pion scattering angle, respectively, in the center-of-mass system. The results are based on a 223 fb À1 data sample collected with the Belle detector at the KEKB e þ e À collider. The differential cross sections are fitted in the energy region 1:7 GeV < W < 2:5 GeV to confirm the two-photon production of two pions in the G wave. In the higher-energy region, we observe production of the c0 charmonium state and obtain the product of its two-photon decay width and branching fraction to 0 0 . We also compare the observed angular dependence and ratios of cross sections for neutral-pion and charged-pion pair production to QCD models. The energy and angular dependence above 3.1 GeV are compatible with those measured in the þ À channel, and in addition we find that the cross section ratio, ð 0 0 Þ=ð þ À Þ, is 0:32 AE 0:03 AE 0:05 on average in the 3.1-4.1 GeV region.

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Photoproduction of neutral pions in the region of the fourth nucleon resonance

Cited by 6 publications

References 7 publications

Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons

Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons

Photoproduction of neutral pions off protons

High-statistics study of neutral-pion pair production in two-photon collisions

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