Angular analysis of $$ {B}^0\to {D}^{\ast -}{D}_s^{\ast +} $$ with $$ {D}_s^{\ast +}\to {D}_s^{+}\gamma $$ decays

Author:

,Aaij R.,Abellán Beteta C.,Ackernley T.,Adeva B.,Adinolfi M.,Afsharnia H.,Aidala C. A.,Aiola S.,Ajaltouni Z.,Akar S.,Albrecht J.,Alessio F.,Alexander M.,Alfonso Albero A.,Aliouche Z.,Alkhazov G.,Alvarez Cartelle P.,Amato S.,Amhis Y.,An L.,Anderlini L.,Andreianov A.,Andreotti M.,Archilli F.,Artamonov A.,Artuso M.,Arzymatov K.,Aslanides E.,Atzeni M.,Audurier B.,Bachmann S.,Bachmayer M.,Back J. J.,Baladron Rodriguez P.,Balagura V.,Baldini W.,Baptista Leite J.,Barlow R. J.,Barsuk S.,Barter W.,Bartolini M.,Baryshnikov F.,Basels J. M.,Bassi G.,Batsukh B.,Battig A.,Bay A.,Becker M.,Bedeschi F.,Bediaga I.,Beiter A.,Belavin V.,Belin S.,Bellee V.,Belous K.,Belov I.,Belyaev I.,Bencivenni G.,Ben-Haim E.,Berezhnoy A.,Bernet R.,Berninghoff D.,Bernstein H. C.,Bertella C.,Bertolin A.,Betancourt C.,Betti F.,Bezshyiko Ia.,Bhasin S.,Bhom J.,Bian L.,Bieker M. S.,Bifani S.,Billoir P.,Birch M.,Bishop F. C. R.,Bitadze A.,Bizzeti A.,Bjørn M.,Blago M. P.,Blake T.,Blanc F.,Blusk S.,Bobulska D.,Boelhauve J. A.,Boente Garcia O.,Boettcher T.,Boldyrev A.,Bondar A.,Bondar N.,Borghi S.,Borisyak M.,Borsato M.,Borsuk J. T.,Bouchiba S. A.,Bowcock T. J. V.,Boyer A.,Bozzi C.,Bradley M. J.,Braun S.,Brea Rodriguez A.,Brodski M.,Brodzicka J.,Brossa Gonzalo A.,Brundu D.,Buonaura A.,Burr C.,Bursche A.,Butkevich A.,Butter J. S.,Buytaert J.,Byczynski W.,Cadeddu S.,Cai H.,Calabrese R.,Calefice L.,Calero Diaz L.,Cali S.,Calladine R.,Calvi M.,Calvo Gomez M.,Camargo Magalhaes P.,Camboni A.,Campana P.,Campoverde Quezada A. F.,Capelli S.,Capriotti L.,Carbone A.,Carboni G.,Cardinale R.,Cardini A.,Carli I.,Carniti P.,Carus L.,Carvalho Akiba K.,Casais Vidal A.,Casse G.,Cattaneo M.,Cavallero G.,Celani S.,Cerasoli J.,Chadwick A. J.,Chapman M. G.,Charles M.,Charpentier Ph.,Chatzikonstantinidis G.,Chavez Barajas C. A.,Chefdeville M.,Chen C.,Chen S.,Chernov A.,Chobanova V.,Cholak S.,Chrzaszcz M.,Chubykin A.,Chulikov V.,Ciambrone P.,Cicala M. F.,Cid Vidal X.,Ciezarek G.,Clarke P. E. L.,Clemencic M.,Cliff H. V.,Closier J.,Cobbledick J. L.,Coco V.,Coelho J. A. B.,Cogan J.,Cogneras E.,Cojocariu L.,Collins P.,Colombo T.,Congedo L.,Contu A.,Cooke N.,Coombs G.,Corti G.,Costa Sobral C. M.,Couturier B.,Craik D. C.,Crkovská J.,Cruz Torres M.,Currie R.,Da Silva C. L.,Dall’Occo E.,Dalseno J.,D’Ambrosio C.,Danilina A.,d’Argent P.,Davis A.,De Aguiar Francisco O.,De Bruyn K.,De Capua S.,De Cian M.,De Miranda J. M.,De Paula L.,De Serio M.,De Simone D.,De Simone P.,de Vries J. A.,Dean C. T.,Decamp D.,Del Buono L.,Delaney B.,Dembinski H.-P.,Dendek A.,Denysenko V.,Derkach D.,Deschamps O.,Desse F.,Dettori F.,Dey B.,Di Nezza P.,Didenko S.,Dieste Maronas L.,Dijkstra H.,Dobishuk V.,Donohoe A. M.,Dordei F.,dos Reis A. C.,Douglas L.,Dovbnya A.,Downes A. G.,Dreimanis K.,Dudek M. W.,Dufour L.,Duk V.,Durante P.,Durham J. M.,Dutta D.,Dziurda A.,Dzyuba A.,Easo S.,Egede U.,Egorychev V.,Eidelman S.,Eisenhardt S.,Ek-In S.,Eklund L.,Ely S.,Ene A.,Epple E.,Escher S.,Eschle J.,Esen S.,Evans T.,Falabella A.,Fan J.,Fan Y.,Fang B.,Farry S.,Fazzini D.,Féo M.,Fernandez Prieto A.,Fernandez-tenllado Arribas J. M.,Fernez A. D.,Ferrari F.,Ferreira Lopes L.,Ferreira Rodrigues F.,Ferreres Sole S.,Ferrillo M.,Ferro-Luzzi M.,Filippov S.,Fini R. A.,Fiorini M.,Firlej M.,Fischer K. M.,Fitzgerald D. S.,Fitzpatrick C.,Fiutowski T.,Fleuret F.,Fontana M.,Fontanelli F.,Forty R.,Franco Lima V.,Franco Sevilla M.,Frank M.,Franzoso E.,Frau G.,Frei C.,Friday D. A.,Fu J.,Fuehring Q.,Funk W.,Gabriel E.,Gaintseva T.,Gallas Torreira A.,Galli D.,Gambetta S.,Gan Y.,Gandelman M.,Gandini P.,Gao Y.,Garau M.,Garcia Martin L. M.,Garcia Moreno P.,García Pardiñas J.,Garcia Plana B.,Garcia Rosales F. A.,Garrido L.,Gaspar C.,Geertsema R. E.,Gerick D.,Gerken L. L.,Gersabeck E.,Gersabeck M.,Gershon T.,Gerstel D.,Ghez Ph.,Gibson V.,Giemza H. 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Abstract

Abstract The first full angular analysis of the $$ {B}^0\to {D}^{\ast -}{D}_s^{\ast +} $$ B 0 D D s + decay is performed using 6 fb1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The $$ {D}_s^{\ast +}\to {D}_s^{+}\gamma $$ D s + D s + γ and D*$$ {\overline{D}}^0{\pi}^{-} $$ D ¯ 0 π vector meson decays are used with the subsequent $$ {D}_s^{+} $$ D s + K+Kπ+ and $$ {\overline{D}}^0 $$ D ¯ 0 K+π decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 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($$ {B}^0\to {D}^{\ast -}{D}_s^{\ast +} $$ B 0 D D s + ) × ℬ($$ {D}_s^{\ast +}\to {D}_s^{+}\gamma $$ D s + D s + γ )]/ℬ(B0D*$$ {D}_s^{+} $$ D s + ) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed BsD*$$ {D}_s^{+} $$ D s + decay is made with a significance of seven standard deviations. The branching fraction ratio ℬ(BsD*$$ {D}_s^{+} $$ D s + )/ℬ(B0D*$$ {D}_s^{+} $$ D s + ) 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.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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