B^0_s meson — LLMpedia

B^0_s meson
Name	B^0_s meson
Composition	strange antiquark + bottom quark
Mass	5366.89 MeV/c^2
Lifetime	1.510 ps

Contents

B^0_s meson

Introduction

The B^0_s meson is a neutral meson composed of a bottom quark and a strange antiquark and plays a central role in studies by collaborations such as CERN, Fermilab, SLAC National Accelerator Laboratory, KEK, DESY and detectors like LHCb, ATLAS, CMS, CDF, DØ and Belle II. Measurements from experiments including LEP, SPS and Tevatron inform our understanding of phenomena probed by projects led by institutions such as Max Planck Society, Lawrence Berkeley National Laboratory, Brookhaven National Laboratory and theoretical groups at Princeton University, Stanford University, University of Oxford, Harvard University and MIT.

The quantum numbers and intrinsic properties of the B^0_s meson are constrained by frameworks developed at centers like CERN Theoretical Physics Department, Perimeter Institute, Institute for Advanced Study and by techniques from teams at Brookhaven National Laboratory and SLAC. Its rest mass measurement is a milestone compared across facilities such as Large Hadron Collider, Tevatron and KEK B factory and evaluated using analyses influenced by work at California Institute of Technology and University of Cambridge. Properties such as lifetime, mass difference, decay constants and form factors are calculated in lattice studies from groups at Fermilab Lattice and MILC Collaborations, RIKEN, University of Glasgow, University of Edinburgh, CERN Lattice Group and ETH Zurich.

Production mechanisms for the B^0_s meson are probed in environments at Large Hadron Collider, Tevatron, SLAC BaBar experiment, Belle experiment and heavy-ion runs at ALICE. Hadroproduction models developed by theorists at Durham University, University of Manchester, Columbia University and University of Chicago guide yields measured by LHCb, CMS, ATLAS, CDF and DØ. Detection techniques use vertexing and tracking systems from collaborations including VELO, ATLAS Inner Detector, CMS Tracker and calorimetry methods advanced at CERN Electromagnetic Calorimeter and BaBar Detector. Triggering strategies and flavor tagging were refined in studies at Fermilab, KEK, DESY and analysed by groups at University of Liverpool, University of Birmingham, University of Bristol and University of Geneva.

The B^0_s system exhibits rapid particle–antiparticle oscillations studied by experimental teams at LHCb, CDF and DØ and predicted in theoretical work by researchers at CERN Theory Division, University of Torino, INFN, Nikhef and CEA Saclay. Measurements of the mass difference Δm_s and width difference ΔΓ_s inform global fits by collaborations including CKMfitter and UTfit with theoretical inputs from FLAG and lattice groups at Fermilab Lattice and MILC Collaborations and RIKEN BNL Research Center. CP-violating phase φ_s is constrained by analyses reported by LHCb Collaboration, ATLAS Collaboration and CMS Collaboration and contextualized within the Cabibbo–Kobayashi–Maskawa matrix framework developed at Nagoya University and KEK. Tensions or consistency with the Standard Model predictions are debated in reviews from Particle Data Group and workshops hosted by IPPP Durham and Les Houches.

Prominent decay channels such as B^0_s → J/ψ φ, B^0_s → μ^+ μ^-, B^0_s → K^+ K^- and semileptonic modes are measured by LHCb, CMS, ATLAS, CDF and Belle II with branching ratios compared to predictions from groups at CERN, IHEP Beijing, Institute of High Energy Physics (China), Peking University and Tata Institute of Fundamental Research. Rare decays and flavor-changing neutral currents are sensitive to effects modeled in papers from SLAC, DESY, IPPP Durham and CERN Theory Group. Analyses of angular distributions and form factors rely on theoretical input from QCD factorization studies at University of Regensburg, SISSA, University of Barcelona and lattice efforts at ETH Zurich and University of Glasgow.

The B^0_s meson provides tests of electroweak and flavor sectors central to research programs at CERN, KEK, Fermilab and by theory groups at Institute for Advanced Study, Perimeter Institute and IAS Princeton. Constraints derived from B^0_s observables inform searches for physics beyond the Standard Model pursued by collaborations such as ATLAS, CMS and LHCb and by theory consortia at DESY, IPPP Durham and INFN. Model-building efforts from groups at University of California, Berkeley, Rutgers University, University of Michigan, Columbia University and University of Toronto use B^0_s results to test scenarios including supersymmetry explored by CERN SUSY Working Group, extra-dimensions examined at CERN Theory Division, and flavor symmetries proposed by teams at Max Planck Institute for Physics and Scuola Normale Superiore.

Key measurements include mass and lifetime determinations reported by Particle Data Group and collaborations LHCb, CDF, DØ, ATLAS and CMS; branching fractions for B^0_s → μ^+ μ^- reported by LHCb and CMS; oscillation frequency Δm_s established by CDF and refined by LHCb; and CP-violating phase φ_s constrained by combined fits from LHCb, ATLAS, CMS and global fits by CKMfitter and UTfit. Results are presented at conferences such as ICHEP, Lepton Photon, EPS-HEP, Moriond, Rencontres de Blois and summarized in reviews by Particle Data Group and working groups at CERN Summer Student Program. Continued data from LHC Run 3, planned upgrades at LHCb Upgrade, HL-LHC and future facilities like FCC and ILC will refine measurements and tests advanced by theoretical collaborations at Fermilab Lattice and MILC Collaborations, FLAG and RIKEN.

Category:Mesons