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arXiv 2109.03066hep-ex
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衍射矢量介子的新测量

New measurements on diffractive vector mesons

Simone Ragoni

摘要:

由于LHC实验提供的独特的运动学范围,近年来高能矢量介子光生引起了人们越来越多的兴趣。ALICE和LHCb的合作提供了测量矢量介子的光生核和质子的目标,即关闭p,铅和氘的目标。大型强子对撞机运行2提供的大数据集允许更多的差分测量。ALICE和LHCb合作最近提供了\PbPb超外围碰撞(UPC)中相干\jpsi的测量。此外,前者还报告了第一次测量的$|t|$依赖性的相干\jpsi在\PbPb,最近还测量了相干\rhozero光生产铅和铅的目标,从而提供了第一次研究的相干\rhozero光生产的A依赖性。ALICE和LHCb也观察到了外围\PbPb碰撞中的矢量介子光生,从而提供了一种可行的技术来提取$10^{-5}$左右的低Bjorken- $x$下的光核截面。最后简要讨论了UPC在四夸克态搜索中的应用潜力。

英文摘要:

Vector meson photoproduction at high energies has attracted increased interest in recent years due to the unique kinematical ranges offered by the LHC experiments. The ALICE and LHCb collaborations have provided measurements of vector meson photoproduction on nuclear and proton targets, i.e. off p, Pb and Xe targets. The large data sets available from LHC Run 2 allow for more differential measurements. The ALICE and LHCb collaborations have recently provided measurements of coherent \jpsi in \PbPb ultra-peripheral collisions (UPC). In addition, the former also reports the first measurement of the $|t|$-dependence of coherent \jpsi in \PbPb, and has also recently measured coherent \rhozero photoproduction off Pb and Xe targets, thus providing the first study of the A dependence of coherent \rhozero photoproduction. Vector meson photoproduction in peripheral \PbPb collisions has also been observed by ALICE and LHCb, thus providing a viable technique to extract photonuclear cross sections at a low Bjorken-$x$ of around $10^{-5}$. Lastly, the potential of UPC for tetraquark searches is briefly discussed.

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