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arXiv 1906.07536hep-exhep-phnucl-exnucl-th
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重离子与部分子和电磁相互作用中希格斯玻色子的产生

Higgs boson production in partonic and electromagnetic interactions with heavy ions

David d'Enterria

摘要:

总结了LHC和未来对撞机上轻、重离子部分子和电磁(光子-光子)相互作用中希格斯玻色子的产生。部分子诱导截面-包括胶子-胶子,矢量-玻色子融合,以及相关的W,Z,t过程-在NNLO与MCFM 8.0使用核部分子分布函数计算。光子-光子截面计算与MadGraph 5.0的超周边A-A相互作用与两个离子幸存的碰撞。在质心能量范围$\sqrt{s} \approx 5$ -100 TeV内,电磁与部分子希格斯截面的比值为$\rm R_{e.m./parton} \approx 10^{-5}$ -10 $^{-4}$。在FCC能量下,由于强的核相干$γ$通量,A-A中的这个比率比p-p中的大10- 100倍。在LHC、HE-LHC和FCC中,在部分子和电子显微镜中最有利的$H\toγγ,b\bar{b}$衰变通道中进行希格斯玻色子测量的可行性。考虑到最终状态的标准接受和效率损失,加上选择标准,以尽量减少各自的连续背景。而$3σ$证据部分和e.m.希格斯粒子的产生需要大约$\times$ 35和$\times$ 200($\times$ 7和$\times$ 30)比在LHC(HE-LHC)运行一个月所预期的更大的积分光度,在FCC仅一个月内就可以保证对两种产生模式进行$5σ$观测。

英文摘要:

Higgs boson production in partonic and electromagnetic (photon-photon) interactions of light- and heavy-ions (A-A) at the LHC and future colliders is summarized. Parton-induced cross sections --including gluon-gluon, vector-boson fusion, and associated W, Z, t processes-- are computed at NNLO with MCFM 8.0 using nuclear parton distribution functions. Photon-photon cross sections are computed with MadGraph 5.0 for ultraperipheral A-A interactions with both ions surviving the collision. In the center-of-mass energy range $\sqrt{s} \approx 5$--100 TeV, the ratio of electromagnetic-to-partonic Higgs cross sections is $\rm R_{e.m./parton} \approx 10^{-5}$--10$^{-4}$. At FCC energies, this ratio is 10--100 times larger in A-A than in p-p thanks to the strong nuclear coherent $γ$ fluxes. The feasibility of Higgs boson measurements at LHC, HE-LHC, and FCC, in the most-favourable $H\toγγ,b\bar{b}$ decay channels in partonic and e.m. interactions respectively, is determined taking into account standard acceptance and efficiency losses on the final states, plus selection criteria to minimize the respective continuum backgrounds. Whereas $3σ$ evidence for partonic and e.m. Higgs production requires about $\times$35 and $\times$200 ($\times$7 and $\times$30) larger integrated luminosities than those expected for a nominal 1-month run at the LHC (HE-LHC), a $5σ$ observation of both production modes is warranted in just one month at the FCC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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