Speaker
Description
Identification of low transverse energy photons from the calorimeter energy deposits is a challenging task in a hadron collider environment. The electromagnetic calorimeter subsystem of CMS has an average noise level of about 30 MeV (80 MeV ) in the Barrel (Endcap) region. The existing photon Identification scheme in proton-proton collisions for the CMS experiment is effective for photons above 8 GeV. For Heavy Ion collisions, dedicated customization of the reconstruction method has led to the identification of photons down to 2 GeV, which helped light by light scattering analysis. In the p-p collisions where the low-q^2 QCD activity is dominant, the low p_T photon multiplicity is very large. We have developed a scheme for identifying photons, as low as 4 GeV, in p-p collisions, using a multivariate technique. This development could help CMS in expanding its reach to rare radiative heavy flavor decays, such as Bs_0→ mu mu gamma , where more than 90 % of the decay phase has a photon less than 10 GeV. Highlights of the this study will be presented in this talk.
| Session | Future Experiments and Detector Development |
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