Production fraction ratios of B+, B-0, and B-s(0) mesons are measured in proton-proton collisions at root s = 13 TeV using a special dataset recorded in 2018 with high-rate triggers designed to collect an unbiased sample of 10(10) b hadrons with the CMS experiment at the LHC. These data allow the study of the opencharm decays of B mesons (B(s) -> pi D-(s) where the D meson decays into fully hadronic final states. By utilizing known branching fractions and precise theoretical calculations, production fraction ratios as functions of B meson transverse momentum (p(T)) and rapidity (y) are measured using open-charm decays in the kinematic range of 8 < p(T) < 60 GeV and vertical bar y vertical bar < 2.25. In addition, the same dataset is used to measure the relative production fraction ratios with the charmonium decay channels [B-(s) -> XJ/psi with X indicating a K+, K*(892)(0), or phi(1020) meson] where the J/psi meson decays into a pair of muons. The open-charm results are used to normalize the relative production fraction ratios obtained from the charmonium samples. Measurements of the ratios of branching fractions of B meson decays to charmonium and open-charm final states are also reported, which will improve the world-average values of these ratios. Finally, we test isospin invariance in B meson production in proton-proton collisions and observe that it holds within the experimental precision.

Measurement of B meson production fraction ratios in proton-proton collisions at √s = 13TeV using open-charm and charmonium decays

Alexe, C.;Bruschini, D.;Ligabue, F.;
2026

Abstract

Production fraction ratios of B+, B-0, and B-s(0) mesons are measured in proton-proton collisions at root s = 13 TeV using a special dataset recorded in 2018 with high-rate triggers designed to collect an unbiased sample of 10(10) b hadrons with the CMS experiment at the LHC. These data allow the study of the opencharm decays of B mesons (B(s) -> pi D-(s) where the D meson decays into fully hadronic final states. By utilizing known branching fractions and precise theoretical calculations, production fraction ratios as functions of B meson transverse momentum (p(T)) and rapidity (y) are measured using open-charm decays in the kinematic range of 8 < p(T) < 60 GeV and vertical bar y vertical bar < 2.25. In addition, the same dataset is used to measure the relative production fraction ratios with the charmonium decay channels [B-(s) -> XJ/psi with X indicating a K+, K*(892)(0), or phi(1020) meson] where the J/psi meson decays into a pair of muons. The open-charm results are used to normalize the relative production fraction ratios obtained from the charmonium samples. Measurements of the ratios of branching fractions of B meson decays to charmonium and open-charm final states are also reported, which will improve the world-average values of these ratios. Finally, we test isospin invariance in B meson production in proton-proton collisions and observe that it holds within the experimental precision.
2026
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Particle production; Bottom mesons; Hadron colliders
   Advanced Multi-Variate Analysis for New Physics Searches at the LHC
   AMVA4NewPhysics
   European Commission
   Horizon 2020 Framework Programme - European Training Networks
   675440

   Search for Higgs bosons decaying to charm quarks
   HIGCC
   European Commission
   Horizon 2020 Framework Programme - European Research Council - Consolidator Grant
   724704

   Direct and indirect searches for new physics in events with top quarks using LHC proton-proton collisions at the CMS detector
   LHCTOPVLQ
   European Commission
   Horizon 2020 Framework Programme - Standard European Fellowships
   752730

   Majorana neutrino discovery strategy with CMS
   MajorNet
   European Commission
   Horizon 2020 Framework Programme - European Research Council - Starting Grant
   758316

   International Training Network for Statistics in High Energy Physics and Society
   INSIGHTS
   European Commission
   Horizon 2020 Framework Programme - European Training Networks
   765710

   The strong interaction at the frontier of knowledge: fundamental research and applications
   STRONG-2020
   European Commission
   Horizon 2020 Framework Programme - Research and Innovation action
   824093

   INnovative TRiggEr techniques for beyond the standard model PhysIcs Discovery at the LHC
   INTREPID
   European Commission
   Horizon Europe Framework Programme - European Research Council - HORIZON ERC Grants
   101115353

   Fundamental properties and time-scan of QCD matter at high densities and temperature exposed by jet substructure in heavy ion collisions with CMS experiment at the LHC
   QCDHighDensityCMS
   European Commission
   Horizon 2020 Framework Programme - European Research Council - Consolidator Grant
   101002207

   Power to the LHC data: an ASYmptotically MOdel-independent measurement of the W boson mass
   ASYMOW
   European Commission
   Horizon 2020 Framework Programme - European Research Council - Consolidator Grant
   101001205
File in questo prodotto:
File Dimensione Formato  
36cv-vst3.pdf

accesso aperto

Tipologia: Published version
Licenza: Creative Commons
Dimensione 1.45 MB
Formato Adobe PDF
1.45 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/170663
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 0
  • OpenAlex 0
social impact