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Abstract: 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 crosssection of diphotons, invariant mass distribution of the diphotons and $p T$distribution of the diphotons and $ZZ$ pairs from Higgs from string balls atLHC. We find that the invariant mass distribution of diphotons from Higgs fromstring 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 ofthe string mass scale set by the recent CMS collaboration at LHC, the$\frac{d\sigma}{dp T}$ of high $p T$ $\ge$ 450 GeV diphotons and $ZZ$ pairsproduced from Higgs from string balls is larger than that from standard modelHiggs. Hence in the absence of black hole production at LHC an enhancement ofhigh $p T$ diphotons and $ZZ$ pairs at LHC can be useful signatures for stringtheory at LHC. Since the matrix element for Higgs production in parton-partoncollisions via string regge excitations is not available we compute$\frac{d\sigma}{dp T}$ of photon production from string regge excitations andmake a comparison with that from string balls at LHC. We find that for stringmass scale $M s$ = 2.5 TeV the $\frac{d\sigma {photon}}{dp T}$ from stringregge excitations is larger than that from string balls and black holes at LHC.



Autor: Gouranga C Nayak

Fuente: https://arxiv.org/







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