Enriching the exploration of the mUED model with event shape variables at the CERN LHC

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• 作者：Amitava Datta^a ; Anindya Datta^b ; ^{adphys@caluniv.ac.in} ; Sujoy Poddar^c
• 刊名：Physics Letters B
• 出版年：2012
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：6 June, 2012
• 卷：712
• 期：3
• 页码：219-225
• 文件大小：217 K

摘要

We propose a new search strategy based on the event shape variables for new physics models where the separations among the masses of the particles in the spectrum are small. Collider signature of these models, characterized by low leptons/jets and low missing , are known to be difficult to look for. The conventional search strategies involving hard cuts may not work in such situations. As a case study, we have investigated the hitherto neglected jets + missing signature - known to be a challenging one - arising from the pair productions and decay of KK-excitations of gluons and quarks in the minimal Universal Extra Dimension (mUED) model. Judicious use of the event shape variables enables us to reduce the Standard Model backgrounds to a negligible level. We have shown that in mUED, up to can be explored or ruled out with 12 fb^鈭? of integrated luminosity at the 7 TeV run of the LHC. We also discuss the prospects of employing these variables for searching other beyond Standard Model physics with compressed or partially compressed spectra.