CMS experiment in 2016 has recorded pp collision events at a center of mass energy of 13 TeV with an integrated luminosity of 35.9 fb−1; the dataset contain large number of events due to top anti-top pair production. Under minimal supersymmetric standard model (MSSM), if top quark is heavier than charged Higgs (H±), one of the top quarks can decay through H± b and the other through W∓ b. Analysis has been performed using leptonic decay more of W and assuming 100% branching ratio for H+ ! c¯s (conjugate channel implied) leading to the final state of a single electron/muon alongwith at least 2 bjets, 2 light quark jets, and missing transverse energy. In the absence of signal, the expected upper limit on the BR of top-quark decaying to charged Higgs and b-quark, as a function of H± mass, is obtained using 2016 MC data sample. The expected limit on the BR(t ! H+b) has been significantly improved, compared to earlier limit, using new techniques which will be presented. As part of the service work, two efforts related to Alignment and Calibration Database of the CMS experiment, will be presented. We shall discuss about the upgradation of FillInfo package which fetches LHC Fill information from online oracle database and stores it to the offline database. The procedure to validate a new software tag (created by different subgroups of the CMS detector) will be discussed as well.
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