Central production of η via double Pomeron exchange and double Reggeon exchange in the Sakai-Sugimoto model

Central production of η via double Pomeron exchange and double Reggeon exchange in the... We use holographic QCD to study Pomeron- and Reggeon-mediated central production in Regge regime hadronic scattering. We focus specifically on η production in proton-proton collisions. While previous work studied the Pomeron-mediated process, the mesonic Regge trajectories (“Reggeons”) we now incorporate contribute significantly at experimentally probed energies. We use the five-point open string amplitude (in flat space) to construct approximate propagators for the Reggeon states, and the five-point closed string amplitude for the Pomeron. Using these “holographic” Reggeons and Pomerons, and low-energy couplings derived in the Sakai-Sugimoto model, we compute the differential and total cross sections at s=29.1  GeV. Our calculation of the total cross section is σ=236  nb, while the experimentally measured value is σ=3859  nb. The discrepancy between our result and the measured value may indicate that our model systematically underestimates the values of the relevant coupling constants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Central production of η via double Pomeron exchange and double Reggeon exchange in the Sakai-Sugimoto model

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Central production of η via double Pomeron exchange and double Reggeon exchange in the Sakai-Sugimoto model

Abstract

We use holographic QCD to study Pomeron- and Reggeon-mediated central production in Regge regime hadronic scattering. We focus specifically on η production in proton-proton collisions. While previous work studied the Pomeron-mediated process, the mesonic Regge trajectories (“Reggeons”) we now incorporate contribute significantly at experimentally probed energies. We use the five-point open string amplitude (in flat space) to construct approximate propagators for the Reggeon states, and the five-point closed string amplitude for the Pomeron. Using these “holographic” Reggeons and Pomerons, and low-energy couplings derived in the Sakai-Sugimoto model, we compute the differential and total cross sections at s=29.1  GeV. Our calculation of the total cross section is σ=236  nb, while the experimentally measured value is σ=3859  nb. The discrepancy between our result and the measured value may indicate that our model systematically underestimates the values of the relevant coupling constants.
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Publisher
American Physical Society (APS)
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.046002
Publisher site
See Article on Publisher Site

Abstract

We use holographic QCD to study Pomeron- and Reggeon-mediated central production in Regge regime hadronic scattering. We focus specifically on η production in proton-proton collisions. While previous work studied the Pomeron-mediated process, the mesonic Regge trajectories (“Reggeons”) we now incorporate contribute significantly at experimentally probed energies. We use the five-point open string amplitude (in flat space) to construct approximate propagators for the Reggeon states, and the five-point closed string amplitude for the Pomeron. Using these “holographic” Reggeons and Pomerons, and low-energy couplings derived in the Sakai-Sugimoto model, we compute the differential and total cross sections at s=29.1  GeV. Our calculation of the total cross section is σ=236  nb, while the experimentally measured value is σ=3859  nb. The discrepancy between our result and the measured value may indicate that our model systematically underestimates the values of the relevant coupling constants.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Aug 15, 2017

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