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arXiv · 1102.0348

First observation of Bs -> D_{s2}^{*+} X mu nu decays

LHCb Collaboration·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 Jr·S. Amato·Y. Amhis·J. Amoraal·J. Anderson·R. Antunes Nobrega·R. B. Appleby·O. Aquines Gutierrez·A. Arefyev·L. 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·Th. Bauer·A. Bay·I. Bediaga·K. Belous·I. Belyaev·M. Benayoun·G. Bencivenni·R. Bernet·M. -O. 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. J. V. 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·Ph. Charpentier·J. Cheng·N. Chiapolini·A. Chlopik·J. Christiansen·P. Ciambrone·X. Cid Vidal
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Abstract

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are detected. Two structures are observed in the D0 K+ mass spectrum at masses consistent with the known D^+_{s1}(2536) and $D^{*+}_{s2}(2573) mesons. The measured branching fractions relative to the total Bs semileptonic rate are B(Bs -> D_{s2}^{*+} X mu nu)/B(Bs -> X mu nu)= (3.3\pm 1.0\pm 0.4)%, and B(Bs -> D_{s1}^+ X munu)/B(Bs -> X mu nu)= (5.4\pm 1.2\pm 0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D_{s2}^{*+} state in Bs decays; we also measure its mass and width.

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LHCb Collaboration, 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 Jr, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R. Antunes Nobrega, R. B. Appleby, O. Aquines Gutierrez, A. Arefyev, L. 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, Th. Bauer, A. Bay, I. Bediaga, K. Belous, I. Belyaev, M. Benayoun, G. Bencivenni, R. Bernet, M. -O. 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. J. V. 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, Ph. Charpentier, J. Cheng, N. Chiapolini, A. Chlopik, J. Christiansen, P. Ciambrone, X. Cid Vidal. 2011-02-02. First observation of Bs -> D_{s2}^{*+} X mu nu decays. https://doi.org/10.1016/j.physletb.2011.02.039

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