First observation of B<sup>0</sup><inf>s</inf>→D*<inf>s2</inf>+Xμν̄- decays

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, M. Agari, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, P. Alvarez Cartelle, A. A. Alves, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R. Antunes Nobrega, R. B. Appleby, O. Aquines Gutierrez, A. ArefyevL. Arrabito, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, D. S. Bailey, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, S. Basiladze, A. Bates, C. Bauer, T. Bauer, A. Bay, I. Bediaga, K. Belous, I. Belyaev, M. Benayoun, G. Bencivenni, R. Bernet, M. Bettler, M. van Beuzekom, S. Bifani, A. Bizzeti, P. M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, B. Bochin, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, E. Bos, T. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, S. Brisbane, M. Britsch, T. Britton, N. H. Brook, H. Brown, A. Büchler-Germann, A. Bursche, J. Buytaert, S. Cadeddu, J. M. Caicedo Carvajal, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, W. Cameron, L. Camilleri, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, M. Charles, P. Charpentier, J. Cheng, N. Chiapolini

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27 Citations (Scopus)


Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B 0 s→D + s+Xμν̄ and B 0 s→D 0K +Xμν̄ are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known D s1(2536) + and D s2*(2573) + mesons. The measured branching fractions relative to the total B-s0 semileptonic rate are B(B 0 s→D s2*+Xμν̄)/B(B 0 s→Xμν̄)=(3.3±1.0±0.4)%, and B(B 0 s→D + s1Xμν̄)/B(B 0 s→Xμν̄)=(5.4±1.2±0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D* + s2 state in B 0 s decays; we also measure its mass and width.

Original languageEnglish
Pages (from-to)14-20
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1
Publication statusPublished - 28 Mar 2011
Externally publishedYes

Bibliographical note

Funding Information:
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 CERN and at the LHCb institutes, and acknowledge support from the National Agencies: CAPES , CNPq , FAPERJ and FINEP (Brazil); CERN ; NSFC (China); CNRS/IN2P3 (France); BMBF , DFG , HGF and MPG (Germany); SFI (Ireland); INFN (Italy); FOM and NWO (Netherlands); SCSR (Poland); ANCS (Romania); MinES of Russia and Rosatom (Russia); MICINN , XUNGAL 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 and the Région Auvergne .

Copyright 2018 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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