Amplitude analysis of the radiative decay $$ {\textrm{B}}_{\textrm{s}}^0 $$ → K+K−γ

Author:

,Aaij R.,Abdelmotteleb A. S. W.,Abellan Beteta C.,Abudinén F.,Ackernley T.,Adefisoye A. A.,Adeva B.,Adinolfi M.,Adlarson P.,Agapopoulou C.,Aidala C. A.,Ajaltouni Z.,Akar S.,Akiba K.,Albicocco P.,Albrecht J.,Alessio F.,Alexander M.,Aliouche Z.,Alvarez Cartelle P.,Amalric R.,Amato S.,Amey J. L.,Amhis Y.,An L.,Anderlini L.,Andersson M.,Andreianov A.,Andreola P.,Andreotti M.,Andreou D.,Anelli A.,Ao D.,Archilli F.,Argenton M.,Arguedas Cuendis S.,Artamonov A.,Artuso M.,Aslanides E.,Atzeni M.,Audurier B.,Bacher D.,Bachiller Perea I.,Bachmann S.,Bachmayer M.,Back J. J.,Baladron Rodriguez P.,Balagura V.,Baldini W.,Bao H.,Baptista de Souza Leite J.,Barbetti M.,Barbosa I. R.,Barlow R. J.,Barnyakov M.,Barsuk S.,Barter W.,Bartolini M.,Bartz J.,Baryshnikov F.,Basels J. M.,Bassi G.,Batsukh B.,Battig A.,Bay A.,Beck A.,Becker M.,Bedeschi F.,Bediaga I. B.,Belin S.,Bellee V.,Belous K.,Belov I.,Belyaev I.,Benane G.,Bencivenni G.,Ben-Haim E.,Berezhnoy A.,Bernet R.,Bernet Andres S.,Bertolin A.,Betancourt C.,Betti F.,Bex J.,Bezshyiko Ia.,Bhom J.,Bieker M. S.,Biesuz N. V.,Billoir P.,Biolchini A.,Birch M.,Bishop F. C. R.,Bitadze A.,Bizzeti A.,Blake T.,Blanc F.,Blank J. E.,Blusk S.,Bocharnikov V.,Boelhauve J. A.,Boente Garcia O.,Boettcher T.,Bohare A.,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.,Brea Rodriguez A.,Breer N.,Brodzicka J.,Brossa Gonzalo A.,Brown J.,Brundu D.,Buchanan E.,Buonaura A.,Buonincontri L.,Burke A. T.,Burr C.,Butkevich A.,Butter J. S.,Buytaert J.,Byczynski W.,Cadeddu S.,Cai H.,Calabrese R.,Calderon Ramirez S.,Calefice L.,Cali S.,Calvi M.,Calvo Gomez M.,Camargo Magalhaes P.,Cambon Bouzas J. I.,Campana P.,Campora Perez D. H.,Campoverde Quezada A. F.,Capelli S.,Capriotti L.,Caravaca-Mora R.,Carbone A.,Carcedo Salgado L.,Cardinale R.,Cardini A.,Carniti P.,Carus L.,Casais Vidal A.,Caspary R.,Casse G.,Castro Godinez J.,Cattaneo M.,Cavallero G.,Cavallini V.,Celani S.,Cervenkov D.,Cesare S.,Chadwick A. J.,Chahrour I.,Charles M.,Charpentier Ph.,Chavez Barajas C. A.,Chefdeville M.,Chen C.,Chen S.,Chen Z.,Chernov A.,Chernyshenko S.,Chobanova V.,Cholak S.,Chrzaszcz M.,Chubykin A.,Chulikov V.,Ciambrone P.,Cid Vidal X.,Ciezarek G.,Cifra P.,Clarke P. E. L.,Clemencic M.,Cliff H. V.,Closier J.,Cocha Toapaxi C.,Coco V.,Cogan J.,Cogneras E.,Cojocariu L.,Collins P.,Colombo T.,Comerma-Montells A.,Congedo L.,Contu A.,Cooke N.,Corredoira I.,Correia A.,Corti G.,Cottee Meldrum J. J.,Couturier B.,Craik D. C.,Cruz Torres M.,Curras Rivera E.,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.,Davidson A.,Davies J. E.,Davis A.,De Aguiar Francisco O.,De Angelis C.,De Benedetti F.,de Boer J.,De Bruyn K.,De Capua S.,De Cian M.,De Freitas Carneiro Da Graca U.,De Lucia E.,De Miranda J. M.,De Paula L.,De Serio M.,De Simone P.,De Vellis F.,de Vries J. A.,Debernardis F.,Decamp D.,Dedu V.,Del Buono L.,Delaney B.,Dembinski H.-P.,Deng J.,Denysenko V.,Deschamps O.,Dettori F.,Dey B.,Di Nezza P.,Diachkov I.,Didenko S.,Ding S.,Dittmann L.,Dobishuk V.,Docheva A. D.,Dong C.,Donohoe A. M.,Dordei F.,dos Reis A. C.,Dowling A. D.,Duan W.,Duda P.,Dudek M. W.,Dufour L.,Duk V.,Durante P.,Duras M. M.,Durham J. M.,Durmus O. D.,Dziurda A.,Dzyuba A.,Easo S.,Eckstein E.,Egede U.,Egorychev A.,Egorychev V.,Eisenhardt S.,Ejopu E.,Ek-In S.,Eklund L.,Elashri M.,Ellbracht J.,Ely S.,Ene A.,Epple E.,Eschle J.,Esen S.,Evans T.,Fabiano F.,Falcao L. N.,Fan Y.,Fang B.,Fantini L.,Faria M.,Farmer K.,Fazzini D.,Felkowski L.,Feng M.,Feo M.,Fernandez Gomez M.,Fernez A. 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Abstract

Abstract A search for radiative decay of $$ {B}_s^0 $$ B s 0 mesons to orbitally excited K+K states is performed using proton proton collisions recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 fb1. The dikaon spectrum in the mass range mKK < 2400 MeV/c2 is dominated by the ϕ(1020) resonance that accounts for almost 70% of the decay rate. Considering the possible contributions of f2(1270), $$ {f}_2^{\prime } $$ f 2 (1525) and f2(2010) meson states, the overall tensor contribution to the amplitude is measured to be$$ {\mathcal{F}}_{\left\{{f}_2\right\}}=16.8\pm 0.5\left(\textrm{stat}.\right)\pm 0.7\left(\textrm{syst}.\right)\%, $$ F f 2 = 16.8 ± 0.5 stat . ± 0.7 syst . % , mostly dominated by the $$ {f}_2^{\prime } $$ f 2 (1525) state. Several statistically equivalent solutions are obtained for the detailed resonant structure depending on whether the smaller amplitudes interfere destructively or constructively with the dominant amplitude. The preferred solution that corresponds to the lowest values of the fit fractions along with constructive interference leads to the relative branching ratio measurement$$ \frac{\mathcal{B}\left({B}_s^0\to {f}_2^{\prime}\gamma \right)}{\mathcal{B}\left({B}_s^0\to \phi \gamma \right)}={19.4}_{-0.8}^{+0.9}{\left(\textrm{stat}.\right)}_{-0.5}^{+1.4}\left(\textrm{syst}.\right)\pm 0.5\left(\mathcal{B}\right)\%, $$ B B s 0 f 2 γ B B s 0 ϕγ = 19.4 0.8 + 0.9 stat . 0.5 + 1.4 syst . ± 0.5 B % , where the last uncertainty is due to the ratio of measured branching fractions to the K+K final state. This result represents the first observation of the radiative $$ {B}_s^0\to {f}_2^{\prime }(1525)\gamma $$ B s 0 f 2 1525 γ decay, which is the second radiative transition observed in the $$ {B}_s^0 $$ B s 0 sector.

Publisher

Springer Science and Business Media LLC

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