Photoproduction of $η$ and $η\prime$ Mesons off Protons
The CBELSA, TAPS Collaboration, :, Volker Crede, A. McVeigh, A. Anisovich, J. Bacelar, R. Bantes, O. Bartholomy, D. Bayadilov, R. Beck, Y. Beloglazov, R. Castel… 展开作者
The CBELSA, TAPS Collaboration, :, Volker Crede, A. McVeigh, A. Anisovich, J. Bacelar, R. Bantes, O. Bartholomy, D. Bayadilov, R. Beck, Y. Beloglazov, R. Castelijns, A. Ehmanns, D. Elsner, K. Essig, R. Ewald, I. Fabry, M. Fuchs, C. Funke, R. Gothe, R. Gregor, A. Gridnev, E. Gutz, S. Hoeffgen, P. Hoffmeister, I. Horn, I. Jaegle, J. Junkersfeld, H. Kalinowsky, S. Kammer, Frank Klein, Friedrich Klein, E. Klempt, M. Konrad, M. Kotulla, B. Krusche, J. Langheinrich, H. Loehner, I. Lopatin, J. Lotz, S. Lugert, D. Menze, T. Mertens, J. Messchendorp, V. Metag, M. Nanova, V. Nikonov, D. Novinski, R. Novotny, M. Ostrick, L. Pant, H. van Pee, M. Pfeiffer, A. Roy, A. Sarantsev, S. Schadmand, C. Schmidt, H. Schmieden, B. Schoch, S. Shende, N. Sparks, A. Suele, V. Sumachev, T. Szczepanek, U. Thoma, D. Trnka, R. Varma, D. Walther, C. Weinheimer, C. Wendel, A. Wilson
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13 pages, 21 figures, updated author list, submitted to PRC
用CBELSA/TAPS探测器测定了质子光生$η$和$η^\prime$的总截面和微分截面，光子能量在0.85和2.55 GeV之间。$η$介子在其两种中性衰变模式$η\toγγ$和$η\to 3π^0\to 6γ$中被检测到，并且首次覆盖了$η$介子的$\rm cos θ_{cm}$中的全角度范围。这些新的$η$光产生数据与早期的CB-ELISA结果一致。在中性衰变到$π^0π^0η\to 6γ$的过程中观察到$η^\prime$介子，并扩展了角范围。
英文摘要：
Total and differential cross sections for $η$ and $η^\prime$ photoproduction off the proton have been determined with the CBELSA/TAPS detector for photon energies between 0.85 and 2.55 GeV. The $η$ mesons are detected in their two neutral decay modes, $η\toγγ$ and $η\to 3π^0\to 6γ$, and for the first time, cover the full angular range in $\rm cos θ_{cm}$ of the $η$ meson. These new $η$ photoproduction data are consistent with the earlier CB-ELSA results. The $η^\prime$ mesons are observed in their neutral decay to $π^0π^0η\to 6γ$ and also extend the coverage in angular range.
Nuclear effects in photoproduction of heavy quarks and vector mesons in ultraperipheral PbPb and pPb collisions at the LHC
通过比较$c\bar{c}$和b-b（bar）在PbPb和pPb碰撞中的光生截面，可以得到对核遮蔽效应的敏感性.光生矢量介子对底层胶子的分布更为敏感。本文研究了在sqrt（s_NN）=5 TeV和sqrt（s_NN）=2.76 $ TeV, respectively. The potentials of using these processes for constraining nuclear gluon shadowing are explored. It is found that photoproduction of $ J/J条件下，在大型强子对撞机上进行的超周边pPb和PbPb碰撞中，重夸克光生和矢量介子光生的截面及其与快度的关系。特别是PbPb碰撞中的$ and $对胶子遮蔽表现出很好的敏感性。
Inclusive heavy meson photoproduction in $pPb$ and $PbPb$ collisions
Federal University of Pelotas（佩洛塔斯联邦大学）；The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences (PAN)（波兰科学院亨利克·涅沃德尼茨基核物理研究所）
Incoherent $ρ$ meson photoproduction in ultraperipheral nuclear collisions at the LHC
利用Gribov-Glauber模型的光子-核散射和广义矢量介子模型的光子强子结构，对大型强子对撞机中Pb-Pb超周边碰撞（UPC）中的非相干光生$ρ$截面进行了预测.我们发现，非弹性核阴影的影响是显着的，并导致额外的25%的抑制的非相干截面。将我们的预测与STARlight Monte Carlo框架的预测进行比较，我们观察到非常显著的差异。
