Exclusive decuplet-baryon pair production in two-photon collisions

Abstract

This work extends our previous studies of two-photon annihilation into baryon-antibaryon pairs from spin-1/2 octet to spin-3/2 decuplet baryons. Our approach is based on perturbative QCD and treats baryons as quarkdiquark systems. Using the same model parameters as in our previous work, supplemented by QCD sum-rule results for decuplet baryon wave functions, we are able to give absolute predictions for decuplet baryon cross sections without introducing new parameters. We find that the ∆ ++ cross section is of the same order of magnitude as the proton cross section, well within experimental bounds.

EXCLUSIVE BARYON-ANTIBARYON PRODUCTION IN γγ COLLISIONS AT e+e- COLLIDERS

“…4 the σ(γγ → ΛΛ) and σ(γγ → Σ 0 Σ 0 ) cross-section measurements are compared to the predictions of the quark-diquark model calculation 20 . The absolute predictions using the standard distribution amplitude 20 (Standard DA) reproduce well the L3 data, the asymptotic DA and the DZ-DA models 20 are excluded. The CLEO 19 and L3…”

“…The dashed line shows the power law fit as desccribed in the text. In b) and c) the σ(γγ → ΛΛ) and σ(γγ → Σ 0 Σ 0 ) measurements are compared to the quardk-diquark model predictions20…”

Charmonium production in ultra-peripheral heavy ion collisions with two-photon processes

“…Recently, the measurement for ultra-peripheral collisions was performed by PHENIX Collaboration [7] and STAR Collaboration [8,9] at Relativistic Heavy Ion Collider (RHIC) energies, as well as ALICE Collaboration [10,11,12,13,14,15] and CMS Collaboration [16,17,18] at Large Hadron Collider (LHC) energies. Moreover, the equivalent photon flux present in high energy nuclear collisions is very high, and has been found many useful applications in photon production [19,20,21,22,23], dilepton production [24,25,26,27,28,29,30], jet production [31,32], double vector meson production [33,34,35,36], (exotic) charmonium production [37,38,39,40,41,42], decupletbaryon pair production [43], doubly heavy baryon production [44], graviton production [45], W/Z boson production [46,47], and Higgs boson production [48,49,50] in the ultra-peripheral h...…”