Observation of the $$ {B}_s^0 $$ → D*+D*− decay

Author:

,Aaij R.,Abdelmotteleb A. S. W.,Abellan Beteta C.,Abudinén F.,Ackernley T.,Adeva B.,Adinolfi M.,Adlarson P.,Afsharnia H.,Agapopoulou C.,Aidala C. A.,Aiola S.,Ajaltouni Z.,Akar S.,Akiba K.,Albrecht J.,Alessio F.,Alexander M.,Alfonso Albero A.,Aliouche Z.,Alvarez Cartelle P.,Amalric R.,Amato S.,Amey J. L.,Amhis Y.,An L.,Anderlini L.,Andersson M.,Andreianov A.,Andreotti M.,Andreou D.,Ao D.,Archilli F.,Artamonov A.,Artuso M.,Aslanides E.,Atzeni M.,Audurier B.,Bachmann S.,Bachmayer M.,Back J. J.,Bailly-reyre A.,Baladron Rodriguez P.,Balagura V.,Baldini W.,Baptista de Souza Leite J.,Barbetti M.,Barlow R. J.,Barsuk S.,Barter W.,Bartolini M.,Baryshnikov F.,Basels J. M.,Bassi G.,Batsukh B.,Battig A.,Bay A.,Beck A.,Becker M.,Bedeschi F.,Bediaga I. B.,Beiter A.,Belavin V.,Belin S.,Bellee V.,Belous K.,Belov I.,Belyaev I.,Benane G.,Bencivenni G.,Ben-Haim E.,Berezhnoy A.,Bernet R.,Bernet Andres S.,Berninghoff D.,Bernstein H. C.,Bertella C.,Bertolin A.,Betancourt C.,Betti F.,Bezshyiko Ia.,Bhasin S.,Bhom J.,Bian L.,Bieker M. S.,Biesuz N. V.,Bifani S.,Billoir P.,Biolchini A.,Birch M.,Bishop F. C. R.,Bitadze A.,Bizzeti A.,Blago M. P.,Blake T.,Blanc F.,Blusk S.,Bobulska D.,Boelhauve J. A.,Boente Garcia O.,Boettcher T.,Boldyrev A.,Bolognani C. S.,Bolzonella R.,Bondar N.,Borgato F.,Borghi S.,Borsato M.,Borsuk J. T.,Bouchiba S. A.,Bowcock T. J. V.,Boyer A.,Bozzi C.,Bradley M. J.,Braun S.,Brea Rodriguez A.,Brodzicka J.,Brossa Gonzalo A.,Brown J.,Brundu D.,Buonaura A.,Buonincontri L.,Burke A. T.,Burr C.,Bursche A.,Butkevich A.,Butter J. S.,Buytaert J.,Byczynski W.,Cadeddu S.,Cai H.,Calabrese R.,Calefice L.,Cali S.,Calladine R.,Calvi M.,Calvo Gomez M.,Campana P.,Campora Perez D. H.,Campoverde Quezada A. F.,Capelli S.,Capriotti L.,Carbone A.,Carboni G.,Cardinale R.,Cardini A.,Carli I.,Carniti P.,Carus L.,Casais Vidal A.,Caspary R.,Casse G.,Cattaneo M.,Cavallero G.,Cavallini V.,Celani S.,Cerasoli J.,Cervenkov D.,Chadwick A. J.,Chapman M. G.,Charles M.,Charpentier Ph.,Chavez Barajas C. A.,Chefdeville M.,Chen C.,Chen S.,Chernov A.,Chernyshenko S.,Chobanova V.,Cholak S.,Chrzaszcz M.,Chubykin A.,Chulikov V.,Ciambrone P.,Cicala M. F.,Cid Vidal X.,Ciezarek G.,Ciullo 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.,Corredoira I.,Corti G.,Couturier B.,Craik D. C.,Crkovská J.,Cruz Torres M.,Currie R.,Da Silva C. L.,Dadabaev S.,Dai L.,Dai X.,Dall’Occo E.,Dalseno J.,D’Ambrosio C.,Daniel J.,Danilina A.,d’Argent P.,Davies J. E.,Davis A.,De Aguiar Francisco O.,de Boer J.,De Bruyn K.,De Capua S.,De Cian M.,De Freitas Carneiro Da Graca U.,De Lucia E.,De Miranda J. 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Abstract

Abstract The first observation of the $$ {B}_s^0 $$ B s 0 → D∗+D decay and the measurement of its branching ratio relative to the B0→ D∗+D decay are presented. The data sample used corresponds to an integrated luminosity of 9 fb1 of proton-proton collisions recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV between 2011 and 2018. The decay is observed with more than 10 standard deviations and the time-integrated ratio of branching fractions is determined to be$$ \frac{\mathcal{B}\left({B}_s^0\to {D}^{\ast +}{D}^{\ast -}\right)}{\mathcal{B}\left({B}^0\to {D}^{\ast +}{D}^{\ast -}\right)}=0.269\pm 0.032\pm 0.011\pm 0.008, $$ B B s 0 D + D B B 0 D + D = 0.269 ± 0.032 ± 0.011 ± 0.008 , where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the fragmentation fraction ratio fs/fd. The $$ {B}_s^0 $$ B s 0 → D*+D* branching fraction is calculated to be$$ \mathcal{B}\left({B}_s^0\to {D}^{\ast +}{D}^{\ast -}\right)=\left(2.15\pm 0.26\pm 0.09\pm 0.06\pm 0.16\right)\times {10}^{-4}, $$ B B s 0 D + D = 2.15 ± 0.26 ± 0.09 ± 0.06 ± 0.16 × 10 4 , where the fourth uncertainty is due to the B0→ D*+D*− branching fraction. These results are calculated using the average $$ {B}_s^0 $$ B s 0 meson lifetime in simulation. Correction factors are reported for scenarios where either a purely heavy or a purely light $$ {B}_s^0 $$ B s 0 eigenstate is considered.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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