Jet fragmentation function and groomed substructure of bottom quark jets in proton-proton collisions at 5.02 TeV

A bstract A measurement of the substructure of bottom quark jets (b jets) in proton-proton (pp) collisions is presented. The measurement uses data collected in pp collisions at $$ \sqrt{s}=5.02 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> TeV, with a low number of simultaneous interactions per bunch crossing, recorded by the CMS experiment in 2017, corresponding to an integrated luminosity of 301 pb − 1 . An algorithm to identify and cluster the charged decay daughters of b hadrons is developed for this analysis, which facilitates the exposure of the gluon radiation pattern of b jets using iterative Cambridge-Aachen declustering. The soft-drop-groomed jet radius, R g , and momentum balance, z g , of b quark jets are presented. These observables can be used to test perturbative quantum chromodynamics predictions that account for mass effects. Because the b hadron is partially reconstructed from its charged decay daughters, only charged particles are used for the jet substructure studies. In addition, a jet fragmentation function, z b,ch , is measured, which is defined as the distribution of the ratio of the transverse momentum ( p T ) of the partially reconstructed b hadron with respect to the charged-particle component of the jet p T . The substructure variable distributions are unfolded to the charged-particle level. The b jet substructure is compared to the substructure of jets in an inclusive jet sample that is dominated by light-quark and gluon jets in order to assess the role of the b quark mass. A strong suppression of emissions at small R g values is observed for b jets when compared to inclusive jets, consistent with the dead-cone effect. The measurement is also compared with theoretical predictions from Monte Carlo event generators. This is the first substructure measurement of b jets that clusters together the b hadron decay daughters independent of the b hadron species and decay channel.

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Publication Details

Journal
Journal of High Energy Physics
Published
2026-04-17
DOI
https://doi.org/10.1007/jhep04(2026)147
Primary Topic
Particle physics theoretical and experimental studies
Type
article
Field-Weighted Citation Impact
0.00

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article

Jet fragmentation function and groomed substructure of bottom quark jets in proton-proton collisions at 5.02 TeV

Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

Jet fragmentation function and groomed substructure of bottom quark jets in proton-proton collisions at 5.02 TeV

article en

Abstract

A bstract A measurement of the substructure of bottom quark jets (b jets) in proton-proton (pp) collisions is presented. The measurement uses data collected in pp collisions at $$ \sqrt{s}=5.02 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> TeV, with a low number of simultaneous interactions per bunch crossing, recorded by the CMS experiment in 2017, corresponding to an integrated luminosity of 301 pb − 1 . An algorithm to identify and cluster the charged decay daughters of b hadrons is developed for this analysis, which facilitates the exposure of the gluon radiation pattern of b jets using iterative Cambridge-Aachen declustering. The soft-drop-groomed jet radius, R g , and momentum balance, z g , of b quark jets are presented. These observables can be used to test perturbative quantum chromodynamics predictions that account for mass effects. Because the b hadron is partially reconstructed from its charged decay daughters, only charged particles are used for the jet substructure studies. In addition, a jet fragmentation function, z b,ch , is measured, which is defined as the distribution of the ratio of the transverse momentum ( p T ) of the partially reconstructed b hadron with respect to the charged-particle component of the jet p T . The substructure variable distributions are unfolded to the charged-particle level. The b jet substructure is compared to the substructure of jets in an inclusive jet sample that is dominated by light-quark and gluon jets in order to assess the role of the b quark mass. A strong suppression of emissions at small R g values is observed for b jets when compared to inclusive jets, consistent with the dead-cone effect. The measurement is also compared with theoretical predictions from Monte Carlo event generators. This is the first substructure measurement of b jets that clusters together the b hadron decay daughters independent of the b hadron species and decay channel.

Journal of High Energy PhysicsVol. 2026(4)
University of Notre Dame (US), Université Libre de Bruxelles (BE), A. Alikhanyan National Laboratory (AM), Vrije Universiteit Brussel (BE), TU Wien (AT), University of Antwerp (BE), University of California, Santa Barbara (US), Universidade Estadual de Campinas (UNICAMP) (BR), Yerevan State University (AM), Indian Institute of Technology Madras (IN), Ghent University Hospital (BE), Universidade do Estado do Rio de Janeiro (BR), Centro Brasileiro de Pesquisas Físicas (BR), Institute of High Energy Physics (AT), UCLouvain (BE)
National Science Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt-Stiftung, CERN, European Commission, Department of Science and Technology, Ministry of Science and Technology, India, Science Foundation Ireland, Deutsche Forschungsgemeinschaft, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Austrian Science Fund, Fonds De La Recherche Scientifique - FNRS, Fonds Wetenschappelijk Onderzoek, Consejo Nacional de Ciencia y Tecnología, Ministerio de Economía y Competitividad, Bulgarian National Science Fund, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Magyar Tudományos Akadémia, A.G. Leventis Foundation, Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, Secretaría de Educación Superior, Ciencia, Tecnología e Innovación, Ministry of Education, India, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Shota Rustaveli National Science Foundation, Universidad Autónoma de San Luis Potosí, Latvijas Zinātnes Padome, Benemérita Universidad Autónoma de Puebla, Pakistan Atomic Energy Commission, University of Science and Technology of China, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, Hellenic Foundation for Research and Innovation, Ministry of Science and ICT, South Korea, Narodowa Agencja Wymiany Akademickiej, Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules
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Particle physics theoretical and experimental studies
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