The CMS MTD detector upgrade for Quark-Gluon Plasma studies with jets

Jets are collimated streams of particles produced in high-energy nuclear and particle collisions commonly used in High Energy Physics for Standard Model tests, probing the properties of Quark-Gluon Plasma (QGP) and searching for new physics. Studies of jet constituent distributions, such as jet shapes and fragmentation functions in heavy-ion collisions at LHC, provide access to the properties of the QGP medium produced in such collisions. The details of in-medium hadronization for hard scattered partons are of particular interest, as experimental measurements of jet properties with identified hadrons remain limited. The new MTD detector upgrade of the CMS experiment at LHC will augment precision intra-jet constituent distribution measurements with particle identification capabilities enabling measurements of jet shapes with identified hadrons. Physics opportunities for the in-medium effects on jet fragmentation were studied with the Monte Carlo data emulating the expected MTD performance. The 2-dimensional correlations in relative azimuth (Δφ) and relative pseudorapidity (Δη) for identified charged particles about the jet direction were used to extract jet shapes and fragmentation patterns. The impact on physics reach was evaluated separately for the barrel (BTL) and endcap (ETL) subsystems of the MTD. The results indicate that the ETL detector addition significantly reduces the uncertainties for jet shape measurements at large radial distances (Δr~1) and enables the extension of these measurements into the regime where QGP medium effects are expected to dominate (1<Δr<1.4).