Study of $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ → J/ψπ+π−K+K− decays
Open Access
- 2 February 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Journal of High Energy Physics
- Vol. 2021 (2), 1-34
- https://doi.org/10.1007/jhep02(2021)024
Abstract
The decays $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → J/ψπ+π − K+K − are studied using a data set corresponding to an integrated luminosity of 9 fb −1, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → $$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$ J / ψK ∗ 0 K ¯ ∗ 0 and $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → χc1(3872)K+K − , where the K+K − pair does not originate from a ϕ meson, are observed for the first time. Precise measurements of the ratios of branching fractions between intermediate χc1(3872)ϕ, $$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$ J / ψK ∗ 0 K ¯ ∗ 0 , ψ(2S)ϕ and χc1(3872)K+K − states are reported. A structure, denoted as X(4740), is observed in the J/ψϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be $$ {\displaystyle \begin{array}{c}{m}_{\mathrm{X}(4740)}=4741\pm 6\pm 6\kern0.5em \mathrm{MeV}/{c}^2,\\ {}{\Gamma}_{\mathrm{X}(4740)}=53\pm 15\pm 11\kern0.5em \mathrm{MeV},\end{array}} $$ m X 4740 = 4741 ± 6 ± 6 MeV / c 2 , Γ X 4740 = 53 ± 15 ± 11 MeV , where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 meson is performed and gives a value of $$ {m}_{{\mathrm{B}}_{\mathrm{s}}^0}=5366.98\pm 0.07\pm 0.13\kern0.5em \mathrm{MeV}/{c}^2. $$ m B s 0 = 5366.98 ± 0.07 ± 0.13 MeV / c 2 .
This publication has 55 references indexed in Scilit:
- Multicolor Quantum Metrology with Entangled PhotonsPhysical Review Letters, 2013
- Measurement of b-hadron massesPhysics Letters B, 2012
- First observation of B0s→J/ψf0(980) decaysPhysics Letters B, 2011
- Nature offrom dataPhysical Review D, 2009
- Excited heavy tetraquarks with hidden charmThe European Physical Journal C, 2008
- A brief introduction to PYTHIA 8.1Computer Physics Communications, 2008
- Spin Dynamics in a Superconductor-Ferromagnet Proximity SystemPhysical Review Letters, 2008
- Reconciling thewith the near-threshold enhancement in thefinal statePhysical Review D, 2007
- Resonances in J/ψ→ϕπ+π− and ϕK+K−Physics Letters B, 2005
- The Large-Sample Distribution of the Likelihood Ratio for Testing Composite HypothesesThe Annals of Mathematical Statistics, 1938