A search for non-resonant D (s) + → π +μ +μ - and D (s) + → π -μ +μ + decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb -1, √at s=7TeV recorded by the LHCb experiment in 2011. No signals are observed and the 90% (95%) confidence level (CL) limits on the branching fractions are found to be B(D + → π +μ +μ -)<7.3(8.3)×10 -8, B(D s + → π +μ +μ -)<4.1(4.8)×10 -7, B(D + → π -μ +μ +)<2.2(2.5)×10 -8, B(D s + → π -μ +μ +)<1.2(1.4)×10 -7. These limits are the most stringent to date.
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 23 Jul 2013|
Bibliographical noteFunding Information:
We would like to thank Nejc Košnik for very useful discussions on the theoretical aspects of the decay modes studied in this Letter. 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); NSFC (China); CNRS/IN2P3 and Region Auvergne (France); BMBF , DFG , HGF and MPG (Germany); SFI (Ireland); INFN (Italy); FOM and NWO (The Netherlands); SCSR (Poland); ANCS/IFA (Romania); MinES , Rosatom , RFBR and NRC “Kurchatov Institute” (Russia); MinECo , XuntaGal and GENCAT (Spain); SNSF and SER (Switzerland); NAS Ukraine (Ukraine); STFC (United Kingdom); NSF (USA). We also acknowledge the support received from the ERC under FP7. The Tier1 computing centres are supported by IN2P3 (France), KIT and BMBF (Germany), INFN (Italy), NWO and SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom). We are thankful for the computing resources put at our disposal by Yandex LLC (Russia), as well as to the communities behind the multiple open source software packages that we depend on.
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics