In this work, we calculate energy loss of heavy quark (charm and bottom) due to elastic collisions and gluon radiation in hot/dense medium. The collisional energy loss has been obtained using QCD calculations. The radiative energy loss is calculated using reaction operator formalism and generalized dead cone approach. We rederive the energy loss expression using same assumptions as

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We report new constraints on light dark matter (DM) boosted by blazars using the 205.4 kg day data from the CDEX-10 experiment located at the China Jinping Underground Laboratory. Two representative blazars, TXS 0506+56 and BL Lacertae are studied. The results derived from TXS 0506+56 exclude DM-nucleon elastic scattering cross sections from 4.6 × 10 −33 cm 2 to 1 × 10 −26 cm 2 for DM masses between 10 keV and 1 GeV, and the results derived from BL Lacertae exclude DMnucleon elastic scattering cross sections from 2.4 × 10 −34 cm 2 to 1 × 10 −26 cm 2 for the same range of DM masses. The constraints correspond to the best sensitivities among solid-state detector experiments in the sub-MeV mass range.

We study the production and evolution of charm and bottom quarks in hot partonic medium produced in heavy ion collisions. The heavy quarks loose energy in the medium which is reflected in the transverse momentum spectra of heavy mesons. The collisional energy loss of heavy quarks has been calculated using QCD calculations. The radiative energy loss is obtained using two models namely reaction operator formalism and generalized dead cone approach. The

We present a study of transverse momentum (p T ) spectra of unidentified charged particles in pp collisions at RHIC and LHC energies from s 62.4 GeV = to 13 TeV using Tsallis/Hagedorn function. The power law of Tsallis/Hagedorn form gives very good description of the hadron spectra in p T range from 0.2 to 300 GeV/c. The power index n of the p T distributions is found to follow a function of the type a b s + with asymptotic value a=6.8. The parameter T governing the soft bulk contribution to the spectra remains almost same over wide range of collision energies. We also provide a Tsallis/Hagedorn fit to the p T spectra of hadrons in pPb and different centralities of PbPb collisions at s 5.02 TeV NN =. The data/fit shows deviations from the Tsallis distribution which become more pronounced as the system size increases. We suggest simple modifications in the Tsallis/Hagedorn power law function and show that the above deviations can be attributed to the transverse flow in low p T region and to the in-medium energy loss in high p T region.