Improved limit on the branching fraction of the rare decay K0S→μ+μ−
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Abstract
A search for the decay K0S→μ+μ− is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of 3 fb −1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV . The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of BF(K0S→μ+μ−)<0.8 (1.0)×10−9 at 90% (95%) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude
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Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., & Albrecht, J. et al. (2017). Improved limit on the branching fraction of the rare decay K0S→μ+μ−. The European Physical Journal C, 77(10). doi: 10.1140/epjc/s10052-017-5230-x
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https://doi.org/10.1140/epjc/s10052-017-5230-xSponsors
We express our gratitude to our colleagues in the
CERN accelerator departments for the excellent performance of the
LHC. We thank the technical and administrative staff at the LHCb institutes.
We acknowledge support from CERN and from the national agencies:
CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC
(China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany);
INFN (Italy); NWO (The Netherlands); MNiSW and NCN (Poland);
MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain);
SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom);
NSF (USA). We acknowledge the computing resources that are
provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN
(Italy), SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom),
RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFINHH
(Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (USA). We are indebted to the communities behind the multiple open source
software packages on which we depend. Individual groups or members
have received support from AvH Foundation (Germany), EPLANET,
Marie Skłodowska-Curie Actions and ERC (European Union), Conseil
Général de Haute-Savoie, Labex ENIGMASS and OCEVU, Région
Auvergne (France), RFBR and Yandex LLC (Russia), GVA, XuntaGal
and GENCAT (Spain), Herchel Smith Fund, The Royal Society,
Royal Commission for the Exhibition of 1851 and the Leverhulme Trust
(United Kingdom)
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© CERN for the benefit of the LHCb collaboration 2017. This article is distributed under the terms of the Creative
Commons Attribution 4.0 International License (http://creativecomm
ons.org/licenses/by/4.0/), which permits unrestricted use, distribution,
and reproduction in any medium, provided you give appropriate credit
to the original author(s) and the source, provide a link to the Creative
Commons license, and indicate if changes were made.
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