Search for hidden-sector bosons in $B^0 \!\to K^{*0}μ^+μ^-$ decays
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Affolder, A.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Anderson, J.
name: Andreassi, G.
name: Andreotti, M.
name: Andrews, J. E.
name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: d'Argent, P.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
name: Bachmann, S.
name: Back, J. J.
name: Badalov, A.
name: Baesso, C.
name: Baldini, W.
name: Barlow, R. J.
name: Barschel, C.
name: Barsuk, S.
name: Barter, W.
name: Batozskaya, V.
name: Battista, V.
name: Bay, A.
name: Beaucourt, L.
name: Beddow, J.
name: Bedeschi, F.
name: Bediaga, I.
name: Bel, L. J.
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name: Belloli, N.
name: Belyaev, I.
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name: Bencivenni, G.
name: Benson, S.
name: Benton, J.
name: Berezhnoy, A.
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name: van Beuzekom, M.
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name: Bifani, S.
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name: Bird, T.
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name: Bizzeti, A.
name: Blake, T.
name: Blanc, F.
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name: Cadeddu, S.
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name: Calvi, M.
name: Gomez, M. Calvo
name: Campana, P.
name: Perez, D. Campora
name: Capriotti, L.
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Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search is presented for hidden-sector bosons, $χ$, produced in the decay ${B^0\!\to K^*(892)^0χ}$, with $K^*(892)^0\!\to K^{+}π^{-}$ and $χ\!\toμ^+μ^-$. The search is performed using $pp$-collision data corresponding to 3.0 fb$^{-1}$ collected with the LHCb detector. No significant signal is observed in the accessible mass range $214 \leq m(χ) \leq 4350$ MeV, and upper limits are placed on the branching fraction product $\mathcal{B}(B^0\!\to K^*(892)^0χ)\times\mathcal{B}(χ\!\toμ^+μ^-)$ as a function of the mass and lifetime of the $χ$ boson. These limits are of the order of $10^{-9}$ for $χ$ lifetimes less than 100 ps over most of the $m(χ)$ range, and place the most stringent constraints to date on many theories that predict the existence of additional low-mass bosons.
description: All figures and tables, along with supplementary material, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-036.html