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arXiv 0904.3560hep-phhep-exhep-thnucl-th
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在LHC上使用弦球的希格斯产生和衰变的弦论

String Theory at LHC Using Higgs Production and Decay From String Balls

Gouranga C Nayak

备注：
Title changed, New results on string regge excitations added, 18 pages latex, 7 figures, Accepted for publication in JHEP
发表信息：
JHEP 1101:039,2011
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摘要：

我们研究了在LHC上$\sqrt{s}$ = 14 TeV的$pp$碰撞中TeV尺度弦球的Higgs产生和衰变。给出了在LHC上弦球中双光子的总截面、不变质量分布、双光子和Higgs粒子对的$p_T$分布和$ZZ$分布。我们发现，来自弦球的希格斯粒子的双光子不变质量分布对双光子不变质量的增加不是很敏感。我们发现，对于弦质量尺度$M_s$ =2.5 TeV，这是最近在LHC的CMS合作组的弦质量尺度的下限，高$p_T$（$\ge$ 450 GeV）双光子和$ZZ$对产生的$\frac{dσ}{dp_T}$从弦球希格斯大于从标准模型希格斯。因此，在LHC没有黑洞产生的情况下，LHC中高$p_T$双光子和$ZZ$对的增强可能是LHC中弦论的有用特征。由于弦regge激发的部分子-部分子碰撞中Higgs产生的矩阵元不可用，我们计算了弦regge激发的光子产生的$\frac{dσ}{dp_T}$，并与LHC弦球的光子产生作了比较。我们发现，对于弦质量尺度$M_s$ = 2.5TeV，LHC弦regge激发的$\frac{dσ_{photon}}{dp_T}$大于弦球和黑洞的$\frac{dσ_{photon}}{dp_T}$。

英文摘要：

We study Higgs production and decay from TeV scale string balls in $pp$ collisions at $\sqrt{s}$ = 14 TeV at LHC. We present the results of total cross section of diphotons, invariant mass distribution of the diphotons and $p_T$ distribution of the diphotons and $ZZ$ pairs from Higgs from string balls at LHC. We find that the invariant mass distribution of diphotons from Higgs from string balls is not very sensitive to the increase in diphoton invariant mass. We find that for string mass scale $M_s$=2.5 TeV, which is the lower limit of the string mass scale set by the recent CMS collaboration at LHC, the $\frac{dσ}{dp_T}$ of high $p_T$ ($\ge$ 450 GeV) diphotons and $ZZ$ pairs produced from Higgs from string balls is larger than that from standard model Higgs. Hence in the absence of black hole production at LHC an enhancement of high $p_T$ diphotons and $ZZ$ pairs at LHC can be useful signatures for string theory at LHC. Since the matrix element for Higgs production in parton-parton collisions via string regge excitations is not available we compute $\frac{dσ}{dp_T}$ of photon production from string regge excitations and make a comparison with that from string balls at LHC. We find that for string mass scale $M_s$ = 2.5 TeV the $\frac{dσ_{photon}}{dp_T}$ from string regge excitations is larger than that from string balls and black holes at LHC.

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