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arXiv · 1102.0206

First observation of Bs -> J/psi f0(980) decays

The LHCb Collaboration·R. Aaij·B. Adeva·M. Adinolfi·C. Adrover·A. Affolder·Z. Ajaltouni·J. Albrecht·F. Alessio·M. Alexander·P. Alvarez Cartelle·A. A. Alves Jr·S. Amato·Y. Amhis·J. Amoraal·J. Anderson·R. B. Appleby·O. Aquines Gutierrez·L. Arrabito·M. Artuso·E. Aslanides·G. Auriemma·S. Bachmann·D. S. Bailey·V. Balagura·W. Baldini·R. J. Barlow·C. Barschel·S. Barsuk·A. Bates·C. Bauer·Th. Bauer·A. Bay·I. Bediaga·K. Belous·I. Belyaev·E. Ben-Haim·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·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·L. Camilleri·P. Campana·G. Capon·A. Carbone·G. Carboni·R. Cardinale·A. Cardini·L. Carson·K. Carvalho Akiba·G. Casse·M. Cattaneo·M. Charles·Ph. Charpentier·N. Chiapolini·X. Cid Vidal·P. J. Clark·P. E. L. Clarke·M. Clemencic·H. V. Cliff·J. Closier·C. Coca·V. Coco·J. Cogan
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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 hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the B_s system. Using a fit to the pi+ pi- mass spectrum with interfering resonances gives R_{f0/phi} = [Gamma(Bs -> J/psi f0, f0 -> pi+ pi-)]/[Gamma(Bs -> J/psi phi, phi -> K+K-)] = 0.252^{+0.046+0.027}_{-0.032-0.033}, where the uncertainties are statistical and systematic, respectively.

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The LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R. B. Appleby, O. Aquines Gutierrez, L. Arrabito, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, D. S. Bailey, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, K. Belous, I. Belyaev, E. Ben-Haim, 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, 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, L. Camilleri, P. Campana, G. Capon, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, M. Charles, Ph. Charpentier, N. Chiapolini, X. Cid Vidal, P. J. Clark, P. E. L. Clarke, M. Clemencic, H. V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan. 2011-02-01. First observation of Bs -> J/psi f0(980) decays. https://doi.org/10.1016/j.physletb.2011.03.006

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