Differential cross section and recoil polarization measurements for the gamma p -> K+ Lambda reaction using CLAS at Jefferson Lab

作者：McCracken M E^*; Bellis M; Meyer C A; Williams M; Adhikari K P; Anghinolfi M; Ball J; Battaglieri M; Berman B L; Biselli A S; Branford D; Briscoe W J; Brooks W K; Burkert V D; Careccia S L; Carman D S; Cole P L; Collins P; Crede V; D'Angelo A; Daniel A; Dashyan N; De Vita R; De Sanctis E; Deur A; Dey B; Dhamija S; Dickson R; Djalali C; Doughty D; Dugger M; Dupre R; El Alaoui A; Eugenio P; Fegan S; Fradi A

来源：Physical Review C, 2010, 81(2): 025201.

DOI：10.1103/PhysRevC.81.025201

We present measurements of the differential cross section and Lambda recoil polarization for the gamma p -> K+ Lambda reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+ p pi(-) and K+ p (missing pi(-)) final-state topologies; results from these analyses were found to exhibit good agreement. These differential-cross-section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300-MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500-MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of nonresonant K+ Lambda photoproduction mechanisms at all production angles.

• 出版日期2010-2
• 单位中国地震局