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| CMS-PAS-HIN-24-005 | ||
| Jet fragmentation function and groomed substructure of bottom quark jets in proton-proton collisions at 5.02 TeV | ||
| CMS Collaboration | ||
| 6 September 2024 | ||
| Abstract: A measurement of the substructure of bottom quark jets (b jets) in proton-proton (pp) collisions is presented. The measurement uses 301 pb$ ^{-1} $ of data collected in pp collisions by the CMS experiment at $ \sqrt{s} = $ 5.02 TeV. An algorithm to identify and cluster the decay charged-particle 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 clustering. The soft drop groomed jet radius $ R_{\mathrm{g}} $ and the groomed momentum balance $ z_{\mathrm{g}} $ of b quark jets are presented. The $ z_{\mathrm{g}} $ and $ R_{\mathrm{g}} $ observables can be used to test perturbative quantum chromodynamics predictions based on the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi parton splitting functions that account for mass effects. Because the b hadron is partially reconstructed using charged particles, only charged particles are used for the jet substructure. In addition, a jet fragmentation function is measured, which is the ratio of the transverse momentum $ p_{\mathrm{T}} $ of the partially reconstructed b hadron with respect to the charged component of the jet $ p_{\mathrm{T}} $. The substructure 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_{\mathrm{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 the b hadron decay daughters. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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