First measurement of strangeness photoproduction with fine mass resolution

Daniel Watts

Research output: Contribution to journalLetterpeer-review


A precise measurement of the cross section for
(p,K+) has been obtained at the real photon
tagging facility at MAMI-C and the Crystal Ball calorimeter. The measurement pioneers a novel
K+ decay tagging technique which has potential application at other facilities employing segmented
calorimeters. The
(p,K+) reaction is the simplest photoreaction involving strange particles and
is one of the most promising routes to gain sensitivity to unobserved nucleon states. The new data
provide the finest invariant mass resolution to date giving much needed constraints on the existence
of long lived excited nucleon states or narrow interference structures. The data also provide new
information to address the significant discrepancy between previous cross section measurements.
Original languageEnglish
JournalPhysical Review Letters
Publication statusUnpublished - 2013


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