Study of the $\vec{p}d \to n\{pp\}_{s}$ charge-exchange reaction using a polarised deuterium target
B. Gou, D. Mchedlishvili, Z. Bagdasarian, S. Barsov, D. Chiladze, S. Dymov, R. Engels, M. Gaisser, R. Gebel, K. Grigoryev, M. Hartmann, A. Kacharava, A. Khoukaz… 展开作者
B. Gou, D. Mchedlishvili, Z. Bagdasarian, S. Barsov, D. Chiladze, S. Dymov, R. Engels, M. Gaisser, R. Gebel, K. Grigoryev, M. Hartmann, A. Kacharava, A. Khoukaz, P. Kulessa, A. Kulikov, A. Lehrach, Z. Li, N. Lomidze, B. Lorentz, G. Macharashvili, S. Merzliakov, M. Mielke, M. Mikirtychyants, S. Mikirtychyants, M. Nioradze, H. Ohm, D. Prasuhn, F. Rathmann, V. Serdyuk, H. Seyfarth, V. Shmakova, H. Ströher, M. Tabidze, S. Trusov, D. Tsirkov, Yu. Uzikov, Yu. Valdau, T. Wang, C. Weidemann, C. Wilkin, X. Yuan
The vector and tensor analysing powers, $A_y$ and $A_{yy}$, of the $\vec{p}d \to n\{pp\}_{s}$ charge-exchange reaction have been measured at a beam energy of 600 MeV at the COSY-ANKE facility by using an unpolarised proton beam incident on an internal storage cell target filled with polarised deuterium gas. The low energy recoiling protons were measured in a pair of silicon tracking telescopes placed on either side of the target. Putting a cut of 3 MeV on the diproton excitation energy ensured that the two protons were dominantly in the $^{1}S_{0}$ state, here denoted by $\{pp\}_{s}$. The polarisation of the deuterium gas was established through measurements in parallel of proton-deuteron elastic scattering. By analysing events where both protons entered the same telescope, the charge-exchange reaction was measured for momentum transfers $q\geq 160$ MeV/$c$. These data provide a good continuation of the earlier results at $q\leq 140$ MeV/$c$ obtained with a polarised deuteron beam. They are also consistent with impulse approximation predictions with little sign evident for any modifications due to multiple scatterings.
Single-Transverse-Spin Asymmetries in Exclusive Photo-production of J/psi in Ultra-Peripheral Collisions in the Fixed-Target Mode at the LHC and in the Collider Mode at RHIC
