arXiv 1607.027742016-07-10hep-exhep-ph

在HERA上利用领先中子的独家$ρ^0$介子光生

Exclusive $ρ^0$ Meson Photoproduction with a Leading Neutron at HERA

S. Levonian

备注：: LaTeX2e, 7 pages with 6 figures. Contribution to the DIS-2016 workshop, to be published in the proceedings

摘要：

第一次测量的独家光生$ρ^0$介子与领先的中子在HERA。这些数据是在2006年和2007年用H1探测器在319 GeV的质心能量下拍摄的，对应的积分亮度为1.16/pb。具有横向动量$p_T<1$ GeV的$ρ^0$介子从它们的衰变重建为带电π介子，而携带大部分入射质子动量$x_L>$ 0.35的领先中子在具有< 0.75 mrad的极角接受度的前向中子量热计中被检测到。单微分和双微分截面作为几个变量的函数进行测量。的数据被解释在一个双重的周边过程，涉及π交换质子顶点的弹性光生的$ρ^0$介子的虚拟π。在单π交换占优的框架下，提取了光子-π散射的弹性截面。该横截面的值表明排他反应$γp \to ρ^0 n π^+$的吸收校正显著。

英文摘要：

A first measurement is presented of exclusive photoproduction of $ρ^0$ mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 1.16/pb. The $ρ^0$ mesons with transverse momenta $p_T<1$ GeV are reconstructed from their decays to charged pions, while leading neutrons carrying a large fraction of the incoming proton momentum, $x_L>$0.35, are detected in the Forward Neutron Calorimeter having a polar angular acceptance < 0.75 mrad. Single- and double-differential cross sections are measured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the proton vertex followed by elastic photoproduction of a $ρ^0$ meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction $γp \to ρ^0 n π^+$.

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摘要：

英文摘要：

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