Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
详细信息    查看全文
文摘
We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pbsingle bondPb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l and ψ(2S)→J/ψπ+π decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval i7" class="mathmlsrc">i7.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=c9a3c76e091b78a619cac69442e18dbb" title="Click to view the MathML source">−0.9<y<0.9 is 71eb1571c8271b16881c6094372">View the MathML source. The ψ(2S) to J/ψ coherent cross section ratio is View the MathML source. The obtained results are compared to predictions from theoretical models.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700