Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2
P. Achenbach, C. Ayerbe Gayoso, J. C. Bernauer, S. Bianchin, R. Böhm, O. Borodina, M. Bösz, D. Bosnar, V. Bozkurt, P. Bydžovský, L. Debenjak, M. O. Distler, A. … 展开作者
P. Achenbach, C. Ayerbe Gayoso, J. C. Bernauer, S. Bianchin, R. Böhm, O. Borodina, M. Bösz, D. Bosnar, V. Bozkurt, P. Bydžovský, L. Debenjak, M. O. Distler, A. Esser, I. Friščić, B. Göküzüm, M. Gómez Rodríguez de la Paz, K. Grießinger, P. Jennewein, E. Kim, M. Makek, H. Merkel, S. Minami, U. Müller, D. Nakajima, L. Nungesser, B. Özel-Tashenov, J. Pochodzalla, M. Potokar, Ch. Rappold, T. R. Saito, S. Sánchez Majos, B. S. Schlimme, S. Širca, M. Weinriefer, C. J. Yoon
Cross section measurements of the exclusive p(e,e'K+)Lambda,Sigma^0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third resonance region with virtual photons of low four-momenta, Q^2= 0.030-0.055 (GeV/c)^2. The MAMI data indicate a smooth transition in Q^2 from photoproduction to electroproduction cross sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N* resonances can be excluded from these models.
Hard exclusive pion electroproduction at backward angles with CLAS
我们报告的第一次测量的横截面独家深虚拟π电生产的质子，$e p \to e^\prime n π^+$，以上的共振区在向后π质心角。测量了$φ^*_π$依赖的截面，从中我们提取了质子的三种结构函数组合。我们的结果与基于核子到π介子跃迁分布振幅（TDAs）的计算结果是一致的，并为核子结构提供了新的解释。
Studying the Strangeness $D$-Term in Hall C via Exclusive $ϕ$ Electroproduction
Argonne National Laboratory（阿贡国家实验室）；A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute)（阿·伊·阿里哈尼扬国家科学实验室（耶烈万物理研究所））；Brookhaven National Laboratory（布鲁克海文国家实验室）；Florida International University（佛罗里达国际大学）；James Madison University（詹姆斯麦迪逊大学）；Jefferson Lab（杰斐逊实验室）；Old Dominion University（老道明大学）；Temple University（天普大学）；Mississippi State University（密西西比州立大学）；New Mexico State University（新墨西哥州立大学）；University of Regina（雷吉纳大学）；Southern University at New Orleans（新奥尔南南方大学）；Stony Brook University（石溪大学）；Department of Physics, Virginia Tech（弗吉尼亚理工大学物理系）；University of York（约克大学）
First exclusive measurements of the K^-pp state - populated in the pp to K^+ Lambda p reaction at 2.85 GeV
我们分析了在T_p = 2.85 $ GeV to search for a K^-pp (= X) nuclear bound state to be formed in the pp to K^+ + X reaction. The deviation spectra of the K^+ missing-mass MM (K^+) and Lambda p invariant-mass M(Lambda-p) with selection of large-angle proton emission revealed a structure with M_X = 2265 +- 2 MeV/c2 and Gamma_X = 118 +- 8$ MeV时，从pp到K^+ λ p的排它过程的DISTO实验数据。
Exclusive $\bm{π^{0}p}$ electroproduction off protons in the resonance region at photon virtualities 0.4~GeV$\bm{^{2}}$ $\bm{\leq~ Q^{2} \leq~1}$~GeV$\bm{^{2}}$
New Results from the Studies of the $N(1440)1/2^+$, $N(1520)3/2^-$, and $Δ(1620)1/2^-$ Resonances in Exclusive $ep \to e'p' π^+ π^-$ Electroproduction with the CLAS Detector
