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Title: Differential cross sections for {gamma}+p{yields}K{sup +}+Y for {lambda} and {sigma}{sup 0} hyperons

Abstract

High-statistics cross sections for the reactions {gamma}+p{yields}K{sup +}+{lambda} and {gamma}+p{yields}K{sup +}+{sigma}{sup 0} have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85<cos{theta}{sub K{sup +}}{sup c.m.}<+0.95. In the K{sup +}{lambda} channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. The position and width of this structure change with angle, indicating that more than one resonance is likely playing a role. The K{sup +}{lambda} channel at forward angles and all energies is well described by a t-channel scaling characteristic of Regge exchange, whereas the same scaling applied to the K{sup +}{sigma}{sup 0} channel is less successful. Several existing theoretical models are compared to the data, but none provide a good representation of the results.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ;  [2];  [3]
  1. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
  2. Rensselaer Polytechnic Institute, Troy, New York 12180-3590 (United States)
  3. Florida International University, Miami, Florida 33199 (United States) (and others)
Publication Date:
OSTI Identifier:
20771376
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.73.035202; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CEBAF ACCELERATOR; DIFFERENTIAL CROSS SECTIONS; GEV RANGE; KAONS PLUS; LAMBDA BARYONS; PARTICLE WIDTHS; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; RESONANCE PARTICLES; SIGMA NEUTRAL PARTICLES; T CHANNEL

Citation Formats

Bradford, R., Schumacher, R.A., McNabb, J.W.C., Todor, L., Bellis, M., Feuerbach, R.J., Kuhn, J., Lachniet, J., Meyer, C.A., Quinn, B.P., Williams, M., Adams, G., Cummings, J.P., Empl, A., Hu, J., Klusman, M., Kubarovsky, V., Napolitano, J., Stoler, P., and Ambrozewicz, P. Differential cross sections for {gamma}+p{yields}K{sup +}+Y for {lambda} and {sigma}{sup 0} hyperons. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.035202.
Bradford, R., Schumacher, R.A., McNabb, J.W.C., Todor, L., Bellis, M., Feuerbach, R.J., Kuhn, J., Lachniet, J., Meyer, C.A., Quinn, B.P., Williams, M., Adams, G., Cummings, J.P., Empl, A., Hu, J., Klusman, M., Kubarovsky, V., Napolitano, J., Stoler, P., & Ambrozewicz, P. Differential cross sections for {gamma}+p{yields}K{sup +}+Y for {lambda} and {sigma}{sup 0} hyperons. United States. doi:10.1103/PhysRevC.73.035202.
Bradford, R., Schumacher, R.A., McNabb, J.W.C., Todor, L., Bellis, M., Feuerbach, R.J., Kuhn, J., Lachniet, J., Meyer, C.A., Quinn, B.P., Williams, M., Adams, G., Cummings, J.P., Empl, A., Hu, J., Klusman, M., Kubarovsky, V., Napolitano, J., Stoler, P., and Ambrozewicz, P. Wed . "Differential cross sections for {gamma}+p{yields}K{sup +}+Y for {lambda} and {sigma}{sup 0} hyperons". United States. doi:10.1103/PhysRevC.73.035202.
@article{osti_20771376,
title = {Differential cross sections for {gamma}+p{yields}K{sup +}+Y for {lambda} and {sigma}{sup 0} hyperons},
author = {Bradford, R. and Schumacher, R.A. and McNabb, J.W.C. and Todor, L. and Bellis, M. and Feuerbach, R.J. and Kuhn, J. and Lachniet, J. and Meyer, C.A. and Quinn, B.P. and Williams, M. and Adams, G. and Cummings, J.P. and Empl, A. and Hu, J. and Klusman, M. and Kubarovsky, V. and Napolitano, J. and Stoler, P. and Ambrozewicz, P.},
abstractNote = {High-statistics cross sections for the reactions {gamma}+p{yields}K{sup +}+{lambda} and {gamma}+p{yields}K{sup +}+{sigma}{sup 0} have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85<cos{theta}{sub K{sup +}}{sup c.m.}<+0.95. In the K{sup +}{lambda} channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. The position and width of this structure change with angle, indicating that more than one resonance is likely playing a role. The K{sup +}{lambda} channel at forward angles and all energies is well described by a t-channel scaling characteristic of Regge exchange, whereas the same scaling applied to the K{sup +}{sigma}{sup 0} channel is less successful. Several existing theoretical models are compared to the data, but none provide a good representation of the results.},
doi = {10.1103/PhysRevC.73.035202},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}