Measurements of Groomed-Jet Substructure of Charm Jets Tagged by D.sup.0./sup. Mesons in Proton-Proton Collisions at √s=13 TeV

0582696 - ÚJF 2024 RIV US eng J - Journal Article
Acharya, S. - Adamová, Dagmar - Adler, A. - Aglieri Rinella, G. - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Filová, V. - Grecká, Ekaterina - Grund, D. - Herman, T. - Isakov, Artem - Kotliarov, Artem - Krupová, D. M. - Křížek, Filip - Křížková Gajdošová, K. - Kushpil, Svetlana - Petráček, V. - Šafařík, K. - Torres, S. R. - Závada, Petr … Total 1037 authors
Measurements of Groomed-Jet Substructure of Charm Jets Tagged by D⁰ Mesons in Proton-Proton Collisions at √s=13 TeV.
Physical Review Letters. Roč. 131, č. 19 (2023), č. článku 192301. ISSN 0031-9007. E-ISSN 1079-7114
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271 ; RVO:61389005
Keywords : ALICE collaboration * heavy ion collision
OECD category: Nuclear physics; Particles and field physics (FZU-D)
Impact factor: 8.6, year: 2022
Method of publishing: Open access
https://doi.org/10.1103/PhysRevLett.131.192301

Understanding the role of parton mass and Casimir color factors in the quantum chromodynamics parton shower represents an important step in characterizing the emission properties of heavy quarks. Recent experimental advances in jet substructure techniques have provided the opportunity to isolate and characterize gluon emissions from heavy quarks. In this Letter, the first direct experimental constraint on the charm-quark splitting function is presented, obtained via the measurement of the groomed shared momentum fraction of the first splitting in charm jets, tagged by a reconstructed D0 meson. The measurement is made in proton-proton collisions at √s=13 TeV, in the low jet transverse-momentum interval of 15≤p jet ch T<30 GeV/c where the emission properties are sensitive to parton mass effects. In addition, the opening angle of the first perturbative emission of the charm quark, as well as the number of perturbative emissions it undergoes, is reported. Comparisons to measurements of an inclusive-jet sample show a steeper splitting function for charm quarks compared with gluons and light quarks. Charm quarks also undergo fewer perturbative emissions in the parton shower, with a reduced probability of large-angle emissions.
Permanent Link: https://hdl.handle.net/11104/0350778