K-Kbar photoproduction from protons

Journal Article · Thu Feb 01 04:00:00 EST 2007 · Eur.Phys.J.A

DOI:https://doi.org/10.1140/epja/i2006-10216-4· OSTI ID:850063

Sibirtsev, A; Haidenbauer, J; Krewald, S; Meissner, Ulf-G; Thomas, A W

We study the contribution of the Drell mechanism driven by K{sup +} and K{sup -} exchange to the reaction {gamma} N {yields} K-{bar K}N. Our calculation implements the full KN and {bar K}N reaction amplitudes in the form of partial wave amplitudes taken from a meson-exchange model (KN) and a partial wave analysis ({bar K}N), respectively. Comparing our results to data of the LAMP2 collaboration we observe that the Drell mechanism alone cannot describe the large {Lambda}(1520) photoproduction rate observed experimentally. We argue that the discrepancy could be due to significant contributions from K*-meson exchange with subsequent excitation of the {Lambda} (1520) resonance. After adding such contributions to our model a good agreement of the LAMP2 experiment is achieved. When applying the same model to the recent SAPHIR data we find an excellent description of the K{sup +}p spectrum and can determine the parameters of the {Lambda} (1600) P{sub 01} resonance, M{sub R} = 1617 {+-} 2 MeV and {Gamma}{sub R} = 117 {+-} 4 MeV, from the K{sup -} p mass distribution.

• Research Organization: TJNAF (Thomas Jefferson National Accelerator Facility, Newport News, VA); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 850063
• Report Number(s): JLAB-THY-05-398; DOE/ER/40150-3566
• Journal Information: Eur.Phys.J.A, Journal Name: Eur.Phys.J.A Vol. 31
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BOSON-EXCHANGE MODELS
EXCITATION
MASS DISTRIBUTION
PARTIAL WAVES
PHOTOPRODUCTION
PROTONS
RESONANCE