Measurement of the mass and lifetime of theΞc+

Journal of High Energy Physics

Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1 collected with the LHCb detector, seven decay modes of the $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + meson into a J/ψ or ψ(2S) meson and three charged hadrons, kaons or pions, are studied. The decays $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + → (ψ(2S) → J/ψπ+π−)π+, $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + → ψ(2S)π+π−π+, $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + → J/ψK+π−π+ and $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + → J/ψK+K−K+ are observed for the first time, and evidence for the $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + → ψ(2S)K+K−π+, decay is found, where J/ψ and ψ(2S) mesons are reconstructed in their dimuon decay modes. The ratios of branching fractions between the different $$ {\mathrm{B}}_{\mathrm{c}}^{+} $$ B c + decays are reported as well as the fractions of the decays proceeding via intermediate resonances. The results largely support the factorisation approach used for a theoretical...

Physical Review Letters, 2006

Physical Review Letters, 2011

Physics Letters B, 1998

New measurements of the lifetime and mass of the + c are presented. The + c has been reconstructed through the two decay channels , + + and + K , +. The data were accumulated by the Fermilab high energy photoproduction experiment E687. The lifetime is

Phys.Lett., 1991

Physics Reports, 1997

Introduction 4 4.4. Sample selection 2. Theoretical treatment of charm and beauty 4.5. Lifetime determination lifetimes 5 4.6. S-/I?' lifetimes 2.1. Phenomenology: Legends with truths 5 4.7. B, lifetime 2.2. From phenomenology to theory 8 4.8. Ah and the generic b-Baryon lifetime 2.3. Methodology of the heavy quark expansion 4.9. zh lifetime for fully integrated rates 10 4. IO. Inclusive measurements 3. The lifetimes of weakly decaying charm 4.11. Overall summary of current lifetime hadrons 17 values 3.1. Experimental devices 18 4.12. Predictions and interpretation of existing 3.2. Vertex reconstruction 38 relevant data 3.3. Lifetimes of the charmed mesons 49 5. Summary and outlook 3.4. Lifetimes of charmed baryons 55 5.1. Comments on the underlying concepts 3.5. Theoretical evaluation of the results 68 5.2. What have we learned and 4. The lifetimes of weakly decaying beauty what will we learn? hadrons 81 5.3. Future prospects for further experimental 4.1. Formation of B states in e+e-and pp 83 data 4.2. Identification of B decays 84 References 4.3. Detector requirements 87

Physical Review D, 1998

Physics Letters B, 2000

Using data recorded at centre-of-mass energies around 183 GeV and 189 GeV with the OPAL detector at LEP, the fundamental coupling of the charm quark to the W boson has been studied. The ratio R W c ≡ Γ (W → c X)/Γ (W → hadrons) has been measured from jet properties, lifetime information, and leptons produced in charm decays. A value compatible with the Standard Model expectation of 0.5 is obtained: R W c = 0.481±0.042 (stat.) ±0.032 (syst.). By combining this result with measurements of the W boson total width and hadronic branching ratio, the magnitude of the CKM matrix element |V cs | is determined to be |V cs | = 0.969 ± 0.058.

Physics Letters B, 1993

2022

The Ξ++ cc → Ξ ′+ c π + decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The Ξ++ cc → Ξ ′+ c π + decay is reconstructed partially, where the photon from the Ξ ′+ c → Ξ+ c γ decay is not reconstructed and the pK−π+ final state of the Ξ+ c baryon is employed. The Ξ ++ cc → Ξ ′+ c π + branching fraction relative to that of the Ξ++ cc → Ξ+ c π+ decay is measured to be 1.41±0.17±0.10, where the first uncertainty is statistical and the second systematic.