Production of charm jets tagged with D $^0$ mesons in pp collisions at $\sqrt{s}$ = 13TeV with ALICE

Kvapil, Jakub ORCID: 0000-0002-0298-9073 (2022). Production of charm jets tagged with D $^0$ mesons in pp collisions at $\sqrt{s}$ = 13TeV with ALICE. University of Birmingham. Ph.D.

Preview

Kvapil2022PhD_Redacted.pdf
Text - Redacted Version
Available under License All rights reserved.
Download (17MB) | Preview

Abstract

The production of charm jets tagged with fully reconstructed D $^0$ mesons measured at $\sqrt{s}$ = 13 TeV by the ALICE detector at the CERN LHC, is presented in this thesis. The D $^0$ mesons are reconstructed through the hadronic decay channel D $^0$ →K− $\pi$ + and its charge conjugate. Jets are reconstructed from charged-particle tracks and the D $^0$ candidate using the anti- $k_T$ algorithm. Results are given for the jet resolution parameters R = 0.2, 0.4, and 0.6 in the pseudorapidity range $\eta_{ch.jet}$ < (0.9 − R) and charged-particle jet transverse momentum 5 < $p_{T,ch.jet}$ < 50 GeV/ $c$ . The $p_{T,ch jet}$ -differential cross-section and the parallel momentum fraction carried by the D $^0$ , $z^{ch}_\|$ , is presented in this thesis. The measurement of in-jet fragmentation can provide valuable information for constraining gluon-to-hadron fragmentation functions, and this measurement provides a unique insight into intermediate transverse momentum. The measurement is compared to several Monte Carlo generators with both leading-order and next-to-leading-order accuracy. The models describe the main features of the $p_{T,ch jet}$ spectra well and provide a good description of the $z^{ch}_\|$ for $p_{T,chjet}$ > 10 GeV/ $c$ . A discrepancy in $z^{ch}_\|$ distributions between data and models is observed for lower $p_{T,ch jet}$ .