Search for long-lived scalar particles in <i>B<SUP>+</SUP>→ K<SUP>+</SUP></i>χ<i>(</i>μ<SUP>+</SUP> μ<SUP>-</SUP><i>)</i> decays



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G
et al (show 758 more authors) (2017) Search for long-lived scalar particles in <i>B<SUP>+</SUP>→ K<SUP>+</SUP></i>χ<i>(</i>μ<SUP>+</SUP> μ<SUP>-</SUP><i>)</i> decays. PHYSICAL REVIEW D, 95 (7). 071101-.

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Abstract

A search for a long-lived scalar particle $\chi$ is performed, looking for the decay ${B^+ \to K^+ \chi}$ with ${\chi \to \mu^+\mu^-}$ in $pp$ collision data corresponding to an integrated luminosity of $3\, {\rm fb}^{-1}$, collected by the LHCb experiment at centre-of-mass energies of $\sqrt{s}=7$ and 8$\,$TeV. This new scalar particle, predicted by Hidden Sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass ${250 < m(\chi) < 4700\,\rm MeV/c^2}$ and lifetime ${0.1 < \tau(\chi) < 1000\,\rm ps}$. Upper limits on the branching fraction $\mathcal{B}(B^+ \to K^+ \chi (\mu^+\mu^-))$ at 95% confidence level are set as a function of $m(\chi)$ and $\tau(\chi)$, varying between $2\times10^{-10}$ and $10^{-7}$. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-052.html
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 11 Sep 2017 13:22
Last Modified: 12 Oct 2023 09:02
DOI: 10.1103/PhysRevD.95.071101
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3009394