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Measurements of groomed-jet substructure of charm jets tagged by D0 mesons in proton-proton collisions at √s=13 TeV

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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...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Crkovská, Jana (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Fokin, Ilya D. (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Kim, Minjung (Author) , Kroesen, Martin (Author) , Nath, Abhishek (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmah, Alexander (Author) , Skorodumovs, Georgijs (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Veen, Casper Arie van (Author) , Völkl, Martin (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author) , Zanone, Federica (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 2023
In: Physical review letters
Year: 2023, Volume: 131, Issue: 19, Pages: 1-13
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.192301
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.131.192301
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.192301
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Author Notes:S. Acharya et al. (ALICE Collaboration*)
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Summary: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≤𝑝jet ch𝑇<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.
Item Description:Veröffentlicht: 7. November 2023
*ALICE Collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, J. Crkovska, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, J. Kim, M. Kim, M. Kroesen, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. Van Veen, M. Völkl, B. Windelbrand, A. Yuncu, F. Zanone [und 1012 weitere Personen]
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.192301

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