Measurement of the cross section for γγ→<i>pp</i>¯

Artuso, M.; He, D.; Goldberg, M.; Horwitz, N.; Kennett, R.; Moneti, G. C.; Muheim, F.; Mukhin, Y.; Playfer, S.; Rozen, Y.; Stone, S.; Thulasidas, M.; Vasseur, G.; Zhu, G. Y.; Bartelt, J.; Csorna, S. E.; Egyed, Z.; Jain, V.; Sheldon, P.; Akerib, D. S.; Barish, B. C.; Chadha, M.; Chan, S.; Cowen, D. F.; Eigen, G.; Miller, J. S.; O'Grady, C.P.; Urheim, J.; Weinstein, A. J.; Acosta, D.; Athanas, M.; Masek, G.; Paar, H. P.; Sivertz, M.; Bean, A.; Gronberg, J.; Kutschke, R.; Menary, S.; Morrison, R. J.; Nakanishi, S.; Nelson, H. N.; Nelson, T. K.; Richman, J. D.; Rýd, A.; Tajima, H.; Schmidt, D.; Sperka, D.; Witherell, M. S.; Procario, M.; Yang, S.; Balest, R.; Cho, K.; Daoudi, M.; Ford, W. T.; Johnson, D. R.; Lingel, K.; Lohner, M.; Rankin, P.; Smith, J. G.; Alexander, J. P.; Bebek, C.; Berkelman, K.; Besson, D.; Browder, T. E.; Cassel, D. G.; Cho, H. A.; Coffman, D. M.; Drell, P. S.; Ehrlich, R.; Galik, R. S.; Garcia-Sciveres, M.; Geiser, B.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Jones, C. D.; Jones, S. L.; Kandaswamy, J.; Katayama, N.; Kim, P. C.; Kreinick, D. L.; Ludwig, G. S.; Masui, J.; Mevissen, J.; Mistry, N. B.; Ng, C. R.; Nordberg, E.; Ogg, M.; Patterson, J. R.; Peterson, D.; Riley, D.; Salman, S.; Sapper, M.; Worden, H. M.; Würthwein, F.; Avery, P.; Freyberger, A.; Rodriguez, J. L.; Stephens, R. W.; Yelton, J.; Cinabro, D.; Henderson, S.; Kinoshita, K.; Liu, T.; Saulnier, M.; Shen, F.; Wilson, Richard; Yamamoto, H.; Ong, B.; Selen, M.; Sadoff, A. J.; Ammar, R.; Ball, S.; Baringer, P.; Coppage, D.; Copty, N.; Davis, R.; Hancock, N.; Kelly, M.; Kwak, N.; Lam, H.; Kubota, Y.; Lattery, M.; Nelson, J. K.; Patton, S.; Perticone, D.; Poling, R.; Savinov, V.; Schrenk, S.; Wang, R.; Alam, M. S.; Kim, I. J.; Nemati, B.; O’Neill, J. J.; Severini, H.; Sun, C. R.; Zoeller, M. M.; Crawford, G.; Daubenmier, C. M.; Fulton, R.; Fujino, D.; Gan, K. K.; Honscheid, K.; Kagan, H.; Kass, R.; Lee, J.; Malchow, R.; Morrow, F.; Skovpen, Yu. I.; Sung, M.; White, C.; Whitmore, J. J.; Wilson, P.; Butler, F.; Fu, X.; Kalbfleisch, G.; Lambrecht, M.; Ross, W. R.; Skubic, P.; Snow, J.; Wang, P. L.; Wood, M.; Bortoletto, D.; Brown, D. N.; Fast, J. E.; McIlwain, R. L.; Miao, T.; Miller, D. H.; Modesitt, M.; Schaffner, S. F.; Shibata, E. I.; Shipsey, I. P. J.; Wang, P. N.; Battle, M.; Ernst, J.; Kroha, H.; Roberts, S.; Sparks, K.; Thorndike, E. H.; Wang, C. H.; Dominick, J.; Sanghera, S.; Shelkov, V.; Skwarnicki, T.; Stroynowski, R.; Volobouev, I.; Zadorozhny, P.

doi:10.1103/physrevd.50.5484

Cited by 32 publications

(34 citation statements)

References 20 publications

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“…In both cases, the measured cross section and the angular distribution are largely in agreement with the previous measurements [3,4,5,6]. As an example, we show the results 1 [7] for the pp measured total cross section in fig.…”

Section: Experimental Statussupporting

confidence: 76%

Hadron pair photoproduction and the Veneziano model

Odagiri

2005

Nuclear Physics A

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We first suppose that low-energy hadron pair photoproduction reactions γ ( * ) γ ( * ) → hh are dominated by s-channel resonance contributions. Their normalization is then calculated by their correspondence with the Reggeon term in the Regge parametrization of the γh total cross sections. For the case of pp, we make use of the measured γp total cross section, and for the case of K + K − , we make use of the corresponding total cross section that is estimated using Regge factorization. For hadrons that have no such data, we can only provide rough estimation based on the additive quark rule. As an effective approach that is convenient and parameter-free, we adopt the Veneziano model in the simplest form. The model is only applicable to the region of low centre-of-mass energy. When the transverse momentum is large, perturbative QCD takes over, whereas in the Regge region, it is known that the Regge pole picture fails in photoproduction. Despite the shortcomings of the model, we find that the parameter-free amplitudes offer a sound description of the data at hand.

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Section: Experimental Statussupporting

confidence: 76%

Hadron pair photoproduction and the Veneziano model

Odagiri

2005

Nuclear Physics A

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“…The FAIR project at GSI with the HESR anti-proton program [5] will offer ideal possibilities to study exclusive channels in pp annihilation, e.g. pp → γγ, the time reversed of the widely studied process γγ → pp [6,7]. Another very interesting channel is pp → π 0 γ because rates will be much higher and the amplitude is related by crossing to meson photoproduction pγ → π 0 p. The latter process has been recently investigated within the handbag approach in Refs.…”

Section: Introductionmentioning

confidence: 99%

The process p¯↦γπwithin the handbag approach

Kroll

Schäfer

2005

Eur. Phys. J. A

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We analyse the exclusive channel pp → γ π 0 , assuming handbag dominance. The soft parts are parametrized in terms of CGLN amplitudes for the qq → γπ 0 transition and form factors for the pp → qq ones, the latter represent moments of Generalized Distribution Amplitudes. We present a combined fit to Fermilab data from E760 taking simultaneously into account information from other exclusive reactions, especially from pp → γγ data. Overall a nicely consistent picture emerges, such that one can hope, that our theoretical analysis will be reliable also for the kinematics of GSI/FAIR, which hopefully will provide much more precise and complete data. Consequently, data from this facility should improve our knowledge both on the proton-antiproton distribution amplitudes and the pion production mechanism. IntroductionThe reliable theoretical treatment of hard exclusive processes has been a challenge for QCD for many years. With the advent of the generalized parton distribution formalism [1] a large class of such processes, all involving some hard scale Q 2 , can now be treated on a firm, perturbative QCD basis, absorbing all non-perturbative soft physics in suitable generalized parton distributions. This success is made possible by the dominance of the handbag diagrams in leading twist, as demonstrated in the factorization proofs. There are other hard exclusive processes for which these rigorous proofs do not apply. Still, however, there are good arguments for the dominance of the handbag contribution in certain regions of phase space also for many of these reactions. Examples of such processes are two-photon annihilations into pair of hadrons for large but not asymptotically large Mandelstam variables, s, −t, −u, for applications see [2,3,4]. The FAIR project at GSI with the HESR anti-proton program [5] will offer ideal possibilities to study exclusive channels in pp annihilation, e.g. pp → γγ, the time reversed of

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“…Measurements of the γ γ → ¯ and γ γ → 0 0 cross sections as a function of W γ γ . In (a) the γ γ → ¯ cross section is compared to the one obtained by CLEO [4]. The dashed line shows the power law fit described in the text.…”

Section: Resultsmentioning

confidence: 99%

“…Calculations of the cross section for this process were performed using the hard scattering approach [2]. Due to the failure of a three-quark calculation [3] to correctly predict the γ γ → pp cross section in the GeV region [4], an alternative quark-diquark model was proposed [5]. This model includes non-perturbative effects through the use of diquarks, a qq bound state within the baryon [6].…”

Section: Introductionmentioning

confidence: 99%

Λ AND Σ⁰ PAIR PRODUCTION IN TWO-PHOTON COLLISIONS AT LEP

Echenard¹

2002

Photon 2001

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Measurement of the cross section for γγ→pp¯

Cited by 32 publications

References 20 publications

Hadron pair photoproduction and the Veneziano model

Hadron pair photoproduction and the Veneziano model

The process p¯↦γπwithin the handbag approach

Λ AND Σ⁰ PAIR PRODUCTION IN TWO-PHOTON COLLISIONS AT LEP

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Measurement of the cross section for γγ→pp¯

Cited by 32 publications

References 20 publications

Hadron pair photoproduction and the Veneziano model

Hadron pair photoproduction and the Veneziano model

The process p¯↦γπwithin the handbag approach

Λ AND Σ0 PAIR PRODUCTION IN TWO-PHOTON COLLISIONS AT LEP

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Λ AND Σ⁰ PAIR PRODUCTION IN TWO-PHOTON COLLISIONS AT LEP