exclusive baryon - antibaryon production in two - photon collisions
نویسنده
چکیده
We study baryon pair production in two-photon collisions, γγ → BB̄, within perturbative quantum chromodynamics, treating baryons as quark-diquark systems. We extend previous work within the same approach by treating constituent-mass effects systematically by means of an expansion in the small parameter (mass/photon energy). Our approach enables us to give a consistent description of the cross sections for all octet baryon channels. Adopting the model parameters from foregoing work, we are able to reproduce the most recent large-momentum-transfer data from LEP for the pp̄, ΛΛ̄, and ΣΣ̄ channels in a quite satisfactory way. We also briefly address the crossed process for the proton channel, γp → γp. PACS. 12.38.Bx perturbative calculation – 13.60.Rj baryon production – 13.60.Fz elastic and Compton scattering
منابع مشابه
Hard Exclusive Baryon-antibaryon Production in 2-γ Collisions
We present a perturbative calculation of baryon pair production in two-photon collisions, γγ → BB̄, in which baryons are treated as quark-diquark systems. Our approach accounts for constituent mass effects in a systematic way. Taking the diquark-model parameters from foregoing studies of other electronand photon-induced baryonic reactions, our results agree well with the most recent large moment...
متن کاملHard exclusive baryon - antibaryon production in two - photon collisions
We study baryon pair production in two-photon collisions, γγ → BB̄, within perturbative quantum chromodynamics, treating baryons as quark-diquark systems. We extend previous work within the same approach by treating constituent-mass effects systematically by means of an expansion in the small parameter (mass/photon energy). Our approach enables us to give a consistent description of the cross se...
متن کاملExclusive Decuplet-Baryon Pair Production in Two-Photon Collisions
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 predict...
متن کاملExperimental Status of Photon Photon into Baryon Antibaryon Pairs
The exclusive production of BB pairs in the collisions of two quasi-real photons have been studied in different experiments at e+e− colliders. Results are presented for the processes γ γ → pp and γ γ → . The cross-section measurements are compared with the recent analytic calculations based on the quark-diquark model predictions. Monte Carlo studies have been done to investigate the PEP-N expec...
متن کامل