Observation of $B^{0}_{s}$–$overline{B}{}^{0}_{s}$ mixing and measurement of mixing frequencies using semileptonic B decays
Observation of $B^{0}_{s}$–$overline{B}{}^{0}_{s}$ mixing and measurement of mixing frequencies using semileptonic B decays
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使用半轻 B 衰变观察 $B^{0}_{s}$–$overline{B}{}^{0}_{s}$ 混合并测量混合频率
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发表时间：
2013
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通讯作者：
B. Sanmartin Sedes
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R. Aaij;B. Adeva;M. Adinolfi;C. Adrover;A. Affolder;Z. Ajaltouni;J. Albrecht;Federico Alessio;M. Alexander;S. Ali;G. Alkhazov;P. Alvarez Cartelle;A. Alves;S. Amato;S. Amerio;Y. Amhis;L. Anderlini;J. Anderson;R. Andreassen;J. Andrews;F. Andrianala;R. Appleby;O. Aquines Gutiérrez;F. Archilli;A. Artamonov;M. Artuso;E. Aslanides;G. Auriemma;M. Baalouch;S. Bachmann;J. Back;C. Baesso;V. Balagura;W. Baldini;R. Barlow;C. Barschel;S. Barsuk;W. Barter;T. Bauer;A. Bay;J. Beddow;F. Bedeschi;I. Bediaga;S. Belogurov;K. Belous;I. Belyaev;E. Ben;G. Bencivenni;S. Benson;J. Benton;A. Berezhnoy;R. Bernet;M. Bettler;M. Beuzekom;A. Bieñ;S. Bifani;T. Bird;A. Bizzeti;P. Bjørnstad;T. Blake;F. Blanc;J. Blouw;S. Blusk;V. Bocci;A. Bondar;N. Bondar;W. Bonivento;S. Borghi;A. Borgia;T. Bowcock;E. Bowen;C. Bozzi;T. Brambach;J. Brand;J. Bressieux;D. Brett;M. Britsch;T. Britton;N. Brook;H. Brown;I. Burducea;A. Bursche;G. Busetto;J. Buytaert;S. Cadeddu;O. Callot;M. Calvi;M. Calvo Gómez;A. Camboni;P. Campana;D. Campora Perez;A. Carbone;G. Carboni;R. Cardinale;A. Cardini;H. Carranza;L. Carson;K. Carvalho Akiba;G. Casse;L. Castillo García;M. Cattaneo;C. Cauet;R. Cenci;M. Charles;P. Charpentier;P. Chen;N. Chiapolini;M. Chrzaszcz;K. Ciba;X. Cid Vidal;G. Ciezarek;P. Clarke;M. Clemencic;H. Cliff;J. Closier;C. Coca;V. Coco;J. Cogan;E. Cogneras;P. Collins;A. Comerma;A. Contu;A. Cook;M. Coombes;S. Coquereau;G. Corti;B. Couturier;G. Cowan;D. Craik;S. Cunliffe;R. Currie;C. D’Ambrosio;P. David;P. David;A. Davis;I. Bonis;K. Bruyn;S. Capua;M. Cian;J. Miranda;L. Paula;W. Silva;P. Simone;D. Decamp;M. Deckenhoff;L. Buono;N. Déléage;D. Derkach;O. Deschamps;F. Dettori;A. Canto;H. Dijkstra;M. Dogaru;S. Donleavy;F. Dordei;A. Dosil Suárez;D. Dossett;A. Dovbnya;F. Dupertuis;P. Durante;R. Dzhelyadin;A. Dziurda;A. Dzyuba;S. Easo;U. Egede;V. Egorychev;S. Eidelman;D. Eijk;S. Eisenhardt;U. Eitschberger;R. Ekelhof;L. Eklund;I. Rifai;C. Elsasser;A. Falabella;C. Färber;G. Fardell;C. Farinelli;S. Farry;D. Ferguson;V. Fernández Albor;F. Ferreira Rodrigues;M. Ferro;S. Filippov;M. Fiore;C. Fitzpatrick;M. Fontana;F. Fontanelli;R. Forty;O. Francisco;M. Frank;C. Frei;M. Frosini;S. Furcas;E. Furfaro;A. Gallas Torreira;D. Galli;M. Gandelman;P. Gandini;Y. Gao;J. Garofoli;P. Garosi;J. Garra Ticó;L. Garrido;C. Gaspar;R. Gauld;E. Gersabeck;M. Gersabeck;T. Gershon;P. Ghez;V. Gibson;L. Giubega;V. Gligorov;C. Göbel;D. Golubkov;A. Golutvin;A. Gomes;P. Gorbounov;H. Gordon;C. Gotti;M. Grabalosa Gándara;R. Graciani Diaz;L. Granado Cardoso;E. Grauges;G. Graziani;A. Grecu;E. Greening;S. Gregson;P. Griffith;O. Grünberg;B. Gui;E. Gushchin;Y. Guz;T. Gys;C. Hadjivasiliou;G. Haefeli;C. Haen;S. Haines;S. Hall;B. Hamilton;T. Hampson;S. Hansmann;N. Harnew;S. Harnew;J. Harrison;T. Hartmann;J. He;T. Head;V. Heijne;K. Hennessy;P. Henrard;J. Hernando Morata;E. Herwijnen;M. Heß;A. Hicheur;E. Hicks;D. Hill;M. Hoballah;P. H. Hopchev;P. Hopchev;W. Hulsbergen;P. Hunt;T. Huse;N. Hussain;D. Hutchcroft;D. Hynds;V. Iakovenko;M. Idzik;P. 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Pietrzyk;T. Pilař;D. Pinci;S. Playfer;M. Plo Casasus;F. Polci;G. Polok;A. Poluektov;E. Polycarpo;A. Popov;D. Popov;B. Popovici;C. Potterat;A. Powell;J. Prisciandaro;A. Pritchard;C. Prouve;V. Pugatch;A. Puig Navarro;G. Punzi;W. Qian;J. Rademacker;B. Rakotomiaramanana;M. Rangel;I. Raniuk;N. Rauschmayr;G. Raven;S. Redford;M. Reid;A. Reis;S. Ricciardi;A. Richards;K. Rinnert;V. Rives Molina;D. Roa Romero;P. Robbe;D. Roberts;E. Rodrigues;P. Rodriguez Perez;S. Roiser;V. Romanovsky;A. Romero Vidal;J. Rouvinet;T. Ruf;F. Ruffini;H. Ruiz;P. Ruiz Valls;G. Sabatino;J. Saborido Silva;N. Sagidova;P. Sail;B. Saitta;V. Salustino Guimaraes;B. Sanmartin Sedes
利用2011年在质心能量为7TeV的pp碰撞中进行的LHCB实验收集的积分光度为1.0Tb的数据样本，测量了$B^{0}_{S}$和B0混合频率Δms和Δmd。大约1.8万个候选事件被选为$B^{0}_{(S)}o D^{-}_{(S)}Mu^{+}$(+ Anything)类型，其中约一半来自峰值型和组合型背景。为了确定B衰变时间，需要对丢失粒子携带的动量进行校正，这是使用基于模拟的统计方法执行的。相关的介子或介子的产生使我们能够标记初始状态的味道，从而解决由于混合而产生的振荡。我们得到了$$egin{Align}&Delta m_S=IGL(17.93pm0.22Extrm{(Stat)}pm0.15Extrm{(Syst)}igr)~Extrm{ps}^{-1}，\&Delta m_d=igl(0.503 pm0.011 Extrm{(Stat)}pm0.013 Extrm{(Syst)}IGr)~Extrm{ps}^{-1}。结束{已对齐}$$
没有振荡的假设被等同于$B^{0}{S}$的5.8标准差和B0的13.0标准差所否定。这是首次观测到仅用半轻子衰变进行的$B^{0}_{S}$混合。
AbstractThe $B^{0}_{s}$ and B0 mixing frequencies, Δms and Δmd, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8×106 candidate events are selected of the type $B^{0}_{(s)} o D^{-}_{(s)} mu^{+}$ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain $$egin{aligned} &Delta m_s = igl( 17.93 pm0.22 extrm{(stat)} pm0.15 extrm{(syst)}igr)~ extrm{ps}^{-1}, \ &Delta m_d = igl( 0.503 pm0.011 extrm{(stat)} pm0.013 extrm{(syst)}igr)~ extrm{ps}^{-1}. end{aligned}$$
The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for $B^{0}_{s}$ and 13.0 standard deviations for B0. This is the first observation of $B^{0}_{s}$ mixing to be made using only semileptonic decays.