Search for dark matter from baryon number violation process in proton-proton collisions at √ s = 13 TeV

The visible content of the Universe is made up of baryons and almost without of anti-baryons, so it requires a baryogenesis mechanism to generate the baryon asymmetry and it is widely believed that successful baryogenesis requires extending the Standard Model. There are strong evidence of invisible contents, Dark Matter (DM) in the universe in astrophysical observations, such as rotational curves of galaxies, gravitational lensing and bullet cluster. This dissertation presents searches for the dark matter production in baryon number violation (BNV) process in proton-proton collision. The data sample, collected by the CMS experiment during the 2016-2018 data (CMS Run 2) taking of the LHC, corresponds to an integrated luminosity of 137/fb at a center-of-mass energy of 13 TeV. The events are required to contain missing transverse momentum and one jet with additional b-tagged jet arising from initial-state gluon splitting. Major SM backgrounds were estimated using five control region data and minor backgrounds were estimated with Monte Carlo background samples. The sensitivity of the CMS Run 2 data to DM coupling to third generation quark was calculated as expected limits. The projection of the limits for Run 3 (300/fb) and HL-LHC (3000/fb) are presented.

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