Angular Analysis Of B0 ->D- Ds+ With Ds+-> Ds+Gamma Decays
R. Aaij,C. Abellan Beteta, T. Ackernley,B. Adeva,M. Adinolfi, H. Afsharnia, C. A. Aidala,S. Aiola, Z. Ajaltouni,S. Akar, J. Albrecht, F. Alessio, M. Alexander,A. Alfonso Albero, Z. Aliouche, G. Alkhazov,P. Alvarez Cartelle,S. Amato, Y. Amhis, L. An,L. Anderlini, A. Andreianov, M. Andreotti,F. Archilli,A. Artamonov,M. Artuso, K. Arzymatov, E. Aslanides,M. Atzeni, B. Audurier,S. Bachmann,M. Bachmayer, J. J. Back,P. Baladron Rodriguez,V Balagura,W. Baldini,J. Baptista Leite,R. J. Barlow, S. Barsuk,W. Barter,M. Bartolini,F. Baryshnikov, J. M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay,M. Becker, F. Bedeschi, I Bediaga, A. Beiter, V Belavin,S. Belin, V Bellee,K. Belous, I Belov, I Belyaev, G. Bencivenni, E. Ben-Haim,A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, A. Bertolin,C. Betancourt, F. Betti,Ia Bezshyiko,S. Bhasin, J. Bhom,L. Bian,M. S. Bieker,S. Bifani, P. Billoir, M. Birch, F. C. R. Bishop, A. Bitadze,A. Bizzeti,M. Bjorn,M. P. Blago,T. Blake,F. Blanc,S. Blusk, D. Bobulska, J. A. Boelhauve,O. Boente Garcia, T. Boettcher, A. Boldyrev,A. Bondar, N. Bondar, S. Borghi, M. Borisyak,M. Borsato,J. T. Borsuk, S. A. Bouchiba,T. J. Bowcock,A. Boyer,C. Bozzi,M. J. Bradley,S. Braun,A. Brea Rodriguez, M. Brodski, J. Brodzicka,A. Brossa Gonzalo, D. Brundu, A. Buonaura,C. Burr, A. Bursche,A. Butkevich,J. S. Butter, J. Buytaert,W. Byczynski,S. Cadeddu,H. Cai,R. Calabrese, L. Calefice,L. Calero Diaz, S. Cali, R. Calladine, M. Calvi,M. Calvo Gomez,P. Camargo Magalhaes, A. Camboni,P. Campana,A. F. Campoverde Quezada,S. Capelli,L. Capriotti,A. Carbone, G. Carboni, R. Cardinale, A. Cardini, I Carli, P. Carniti, L. Carus,K. Carvalho Akiba,A. Casais Vidal,G. Casse,M. Cattaneo,G. Cavallero, S. Celani,J. Cerasoli, A. J. Chadwick,M. G. Chapman,M. Charles,Ph Charpentier,G. Chatzikonstantinidis,C. A. Chavez Barajas, M. Chefdeville,C. Chen,S. Chen,A. Chernov,V Chobanova, S. Cholak, M. Chrzaszcz, A. Chubykin, V Chulikov, P. Ciambrone,M. F. Cicala,X. Cid Vidal, G. 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JOURNAL OF HIGH ENERGY PHYSICS（2021）
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摘要
The first full angular analysis of the B0 -> D-Ds+ decay is performed using 6 fb(-1) of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The Ds+-> Ds+gamma and D*- -> D0- vector meson decays are used with the subsequent Ds+ -> K+K-pi (+) and D0 -> K+pi (-) decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be f(L) = 0.578 +/- 0.010 +/- 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [B(B0 -> D-Ds+) x B(Ds+-> Ds+gamma)]/B(B-0 -> D(*-)Ds+) is measured to be 2.045 +/- 0.022 +/- 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed B-s -> D(*-)Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio B(B-s -> D(*-)Ds+)/B(B-0 -> D(*-)Ds+) is measured to be 0.049 +/- 0.006 +/- 0.003 +/- 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions.更多
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关键词
B physics, Branching fraction, Hadron-Hadron scattering (experiments), Polarization
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