Differential branching fraction and angular analysis of Λ0 b → Λμ+μ− decays

Author:

,Aaij R.,Adeva B.,Adinolfi M.,Affolder A.,Ajaltouni Z.,Akar S.,Albrecht J.,Alessio F.,Alexander M.,Ali S.,Alkhazov G.,Alvarez Cartelle P.,Alves A. A.,Amato S.,Amerio S.,Amhis Y.,An L.,Anderlini L.,Anderson J.,Andreotti M.,Andrews J. E.,Appleby R. B.,Aquines Gutierrez O.,Archilli F.,Artamonov A.,Artuso M.,Aslanides E.,Auriemma G.,Baalouch M.,Bachmann S.,Back J. J.,Badalov A.,Baesso C.,Baldini W.,Barlow R. J.,Barschel C.,Barsuk S.,Barter W.,Batozskaya V.,Battista V.,Bay A.,Beaucourt L.,Beddow J.,Bedeschi F.,Bediaga I.,Bel L. J.,Belyaev I.,Ben-Haim E.,Bencivenni G.,Benson S.,Benton J.,Berezhnoy A.,Bernet R.,Bertolin A.,Bettler M.-O.,van Beuzekom M.,Bien A.,Bifani S.,Bird T.,Bizzeti A.,Blake T.,Blanc F.,Blouw J.,Blusk S.,Bocci V.,Bondar A.,Bondar N.,Bonivento W.,Borghi S.,Borsato M.,Bowcock T. J. V.,Bowen E.,Bozzi C.,Braun S.,Brett D.,Britsch M.,Britton T.,Brodzicka J.,Brook N. H.,Bursche A.,Buytaert J.,Cadeddu S.,Calabrese R.,Calvi M.,Calvo Gomez M.,Campana P.,Campora Perez D.,Capriotti L.,Carbone A.,Carboni G.,Cardinale R.,Cardini A.,Carniti P.,Carson L.,Carvalho Akiba K.,Casanova Mohr R.,Casse G.,Cassina L.,Castillo Garcia L.,Cattaneo M.,Cauet Ch.,Cavallero G.,Cenci R.,Charles M.,Charpentier Ph.,Chefdeville M.,Chen S.,Cheung S.-F.,Chiapolini N.,Chrzaszcz M.,Cid Vidal X.,Ciezarek G.,Clarke P. E. L.,Clemencic M.,Cliff H. V.,Closier J.,Coco V.,Cogan J.,Cogneras E.,Cogoni V.,Cojocariu L.,Collazuol G.,Collins P.,Comerma-Montells A.,Contu A.,Cook A.,Coombes M.,Coquereau S.,Corti G.,Corvo M.,Counts I.,Couturier B.,Cowan G. A.,Craik D. C.,Crocombe A. C.,Torres M. Cruz,Cunliffe S.,Currie R.,D’Ambrosio C.,Dalseno J.,David P. N. Y.,Davis A.,De Bruyn K.,De Capua S.,De Cian M.,De Miranda J. M.,De Paula L.,De Silva W.,De Simone P.,Dean C.-T.,Decamp D.,Deckenhoff M.,Del Buono L.,Déléage N.,Derkach D.,Deschamps O.,Dettori F.,Dey B.,Di Canto A.,Di Ruscio F.,Dijkstra H.,Donleavy S.,Dordei F.,Dorigo M.,Dosil Suárez A.,Dossett D.,Dovbnya A.,Dreimanis K.,Dujany G.,Dupertuis F.,Durante P.,Dzhelyadin R.,Dziurda A.,Dzyuba A.,Easo S.,Egede U.,Egorychev V.,Eidelman S.,Eisenhardt S.,Eitschberger U.,Ekelhof R.,Eklund L.,El Rifai I.,Elsasser Ch.,Ely S.,Esen S.,Evans H. M.,Evans T.,Falabella A.,Färber C.,Farinelli C.,Farley N.,Farry S.,Fay R.,Ferguson D.,Fernandez Albor V.,Ferrari F.,Ferreira Rodrigues F.,Ferro-Luzzi M.,Filippov S.,Fiore M.,Fiorini M.,Firlej M.,Fitzpatrick C.,Fiutowski T.,Fol P.,Fontana M.,Fontanelli F.,Forty R.,Francisco O.,Frank M.,Frei C.,Frosini M.,Fu J.,Furfaro E.,Gallas Torreira A.,Galli D.,Gallorini S.,Gambetta S.,Gandelman M.,Gandini P.,Gao Y.,García Pardiñas J.,Garofoli J.,Garra Tico J.,Garrido L.,Gascon D.,Gaspar C.,Gastaldi U.,Gauld R.,Gavardi L.,Gazzoni G.,Geraci A.,Gerick D.,Gersabeck E.,Gersabeck M.,Gershon T.,Ghez Ph.,Gianelle A.,Gianì S.,Gibson V.,Giubega L.,Gligorov V. V.,Göbel C.,Golubkov D.,Golutvin A.,Gomes A.,Gotti C.,Grabalosa Gándara M.,Graciani Diaz R.,Granado Cardoso L. A.,Graugés E.,Graverini E.,Graziani G.,Grecu A.,Greening E.,Gregson S.,Griffith P.,Grillo L.,Grünberg O.,Gui B.,Gushchin E.,Guz Yu.,Gys T.,Hadjivasiliou C.,Haefeli G.,Haen C.,Haines S. C.,Hall S.,Hamilton B.,Hampson T.,Han X.,Hansmann-Menzemer S.,Harnew N.,Harnew S. T.,Harrison J.,He J.,Head T.,Heijne V.,Hennessy K.,Henrard P.,Henry L.,Hernando Morata J. A.,van Herwijnen E.,Heß M.,Hicheur A.,Hill D.,Hoballah M.,Hombach C.,Hulsbergen W.,Humair T.,Hussain N.,Hutchcroft D.,Hynds D.,Idzik M.,Ilten P.,Jacobsson R.,Jaeger A.,Jalocha J.,Jans E.,Jawahery A.,Jing F.,John M.,Johnson D.,Jones C. R.,Joram C.,Jost B.,Jurik N.,Kandybei S.,Kanso W.,Karacson M.,Karbach T. M.,Karodia S.,Kelsey M.,Kenyon I. R.,Kenzie M.,Ketel T.,Khanji B.,Khurewathanakul C.,Klaver S.,Klimaszewski K.,Kochebina O.,Kolpin M.,Komarov I.,Koopman R. F.,Koppenburg P.,Korolev M.,Kravchuk L.,Kreplin K.,Kreps M.,Krocker G.,Krokovny P.,Kruse F.,Kucewicz W.,Kucharczyk M.,Kudryavtsev V.,Kurek K.,Kvaratskheliya T.,La Thi V. N.,Lacarrere D.,Lafferty G.,Lai A.,Lambert D.,Lambert R. W.,Lanfranchi G.,Langenbruch C.,Langhans B.,Latham T.,Lazzeroni C.,Le Gac R.,van Leerdam J.,Lees J.-P.,Lefèvre R.,Leflat A.,Lefrançois J.,Leroy O.,Lesiak T.,Leverington B.,Li Y.,Likhomanenko T.,Liles M.,Lindner R.,Linn C.,Lionetto F.,Liu B.,Lohn S.,Longstaff I.,Lopes J. H.,Lowdon P.,Lucchesi D.,Luo H.,Lupato A.,Luppi E.,Lupton O.,Machefert F.,Maciuc F.,Maev O.,Malde S.,Malinin A.,Manca G.,Mancinelli G.,Manning P.,Mapelli A.,Maratas J.,Marchand J. F.,Marconi U.,Marin Benito C.,Marino P.,Märki R.,Marks J.,Martellotti G.,Martinelli M.,Martinez Santos D.,Martinez Vidal F.,Martins Tostes D.,Massafferri A.,Matev R.,Mathad A.,Mathe Z.,Matteuzzi C.,Mauri A.,Maurin B.,Mazurov A.,McCann M.,McCarthy J.,McNab A.,McNulty R.,Meadows B.,Meier F.,Meissner M.,Merk M.,Milanes D. A.,Minard M.-N.,Mitzel D. S.,Molina Rodriguez J.,Monteil S.,Morandin M.,Morawski P.,Mordà A.,Morello M. J.,Moron J.,Morris A.-B.,Mountain R.,Muheim F.,Müller K.,Mussini M.,Muster B.,Naik P.,Nakada T.,Nandakumar R.,Nasteva I.,Needham M.,Neri N.,Neubert S.,Neufeld N.,Neuner M.,Nguyen A. D.,Nguyen T. D.,Nguyen-Mau C.,Niess V.,Niet R.,Nikitin N.,Nikodem T.,Novoselov A.,O’Hanlon D. P.,Oblakowska-Mucha A.,Obraztsov V.,Ogilvy S.,Okhrimenko O.,Oldeman R.,Onderwater C. J. G.,Osorio Rodrigues B.,Otalora Goicochea J. M.,Otto A.,Owen P.,Oyanguren A.,Palano A.,Palombo F.,Palutan M.,Panman J.,Papanestis A.,Pappagallo M.,Pappalardo L. L.,Parkes C.,Passaleva G.,Patel G. D.,Patel M.,Patrignani C.,Pearce A.,Pellegrino A.,Penso G.,Pepe Altarelli M.,Perazzini S.,Perret P.,Pescatore L.,Petridis K.,Petrolini A.,Picatoste Olloqui E.,Pietrzyk B.,Pilař T.,Pinci D.,Pistone A.,Playfer S.,Plo Casasus M.,Poikela T.,Polci F.,Poluektov A.,Polyakov I.,Polycarpo E.,Popov A.,Popov D.,Popovici B.,Potterat C.,Price E.,Price J. D.,Prisciandaro J.,Pritchard A.,Prouve C.,Pugatch V.,Puig Navarro A.,Punzi G.,Qian W.,Quagliani R.,Rachwal B.,Rademacker J. H.,Rakotomiaramanana B.,Rama M.,Rangel M. S.,Raniuk I.,Rauschmayr N.,Raven G.,Redi F.,Reichert S.,Reid M. M.,dos Reis A. C.,Ricciardi S.,Richards S.,Rihl M.,Rinnert K.,Rives Molina V.,Robbe P.,Rodrigues A. B.,Rodrigues E.,Rodriguez Lopez J. A.,Rodriguez Perez P.,Roiser S.,Romanovsky V.,Romero Vidal A.,Rotondo M.,Rouvinet J.,Ruf T.,Ruiz H.,Ruiz Valls P.,Saborido Silva J. J.,Sagidova N.,Sail P.,Saitta B.,Salustino Guimaraes V.,Sanchez Mayordomo C.,Sanmartin Sedes B.,Santacesaria R.,Santamarina Rios C.,Santovetti E.,Sarti A.,Satriano C.,Satta A.,Saunders D. M.,Savrina D.,Schiller M.,Schindler H.,Schlupp M.,Schmelling M.,Schmidt B.,Schneider O.,Schopper A.,Schune M.-H.,Schwemmer R.,Sciascia B.,Sciubba A.,Semennikov A.,Sepp I.,Serra N.,Serrano J.,Sestini L.,Seyfert P.,Shapkin M.,Shapoval I.,Shcheglov Y.,Shears T.,Shekhtman L.,Shevchenko V.,Shires A.,Silva Coutinho R.,Simi G.,Sirendi M.,Skidmore N.,Skillicorn I.,Skwarnicki T.,Smith N. A.,Smith E.,Smith E.,Smith J.,Smith M.,Snoek H.,Sokoloff M. D.,Soler F. J. P.,Soomro F.,Souza D.,Souza De Paula B.,Spaan B.,Spradlin P.,Sridharan S.,Stagni F.,Stahl M.,Stahl S.,Steinkamp O.,Stenyakin O.,Sterpka F.,Stevenson S.,Stoica S.,Stone S.,Storaci B.,Stracka S.,Straticiuc M.,Straumann U.,Stroili R.,Sun L.,Sutcliffe W.,Swientek K.,Swientek S.,Syropoulos V.,Szczekowski M.,Szczypka P.,Szumlak T.,T’Jampens S.,Teklishyn M.,Tellarini G.,Teubert F.,Thomas C.,Thomas E.,van Tilburg J.,Tisserand V.,Tobin M.,Todd J.,Tolk S.,Tomassetti L.,Tonelli D.,Topp-Joergensen S.,Torr N.,Tournefier E.,Tourneur S.,Trabelsi K.,Tran M. T.,Tresch M.,Trisovic A.,Tsaregorodtsev A.,Tsopelas P.,Tuning N.,Ukleja A.,Ustyuzhanin A.,Uwer U.,Vacca C.,Vagnoni V.,Valenti G.,Vallier A.,Vazquez Gomez R.,Vazquez Regueiro P.,Vázquez Sierra C.,Vecchi S.,Velthuis J. J.,Veltri M.,Veneziano G.,Vesterinen M.,Viana Barbosa J. V.,Viaud B.,Vieira D.,Vieites Diaz M.,Vilasis-Cardona X.,Vollhardt A.,Volyanskyy D.,Voong D.,Vorobyev A.,Vorobyev V.,Voß C.,de Vries J. A.,Waldi R.,Wallace C.,Wallace R.,Walsh J.,Wandernoth S.,Wang J.,Ward D. R.,Watson N. K.,Websdale D.,Weiden A.,Whitehead M.,Wiedner D.,Wilkinson G.,Wilkinson M.,Williams M.,Williams M. P.,Williams M.,Wilson F. F.,Wimberley J.,Wishahi J.,Wislicki W.,Witek M.,Wormser G.,Wotton S. A.,Wright S.,Wyllie K.,Xie Y.,Xu Z.,Yang Z.,Yuan X.,Yushchenko O.,Zangoli M.,Zavertyaev M.,Zhang L.,Zhang Y.,Zhelezov A.,Zhokhov A.,Zhong L.

Abstract

Abstract The differential branching fraction of the rare decay Λ b 0  → Λμ + μ is measured as a function of q 2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. Evidence of signal is observed in the q 2 region below the square of the J/ψ mass. Integrating over 15 < q 2 < 20 GeV2 /c 4 the differential branching fraction is measured as $$ \mathrm{d}\mathrm{\mathcal{B}}\left({\varLambda}_b^0\to \varLambda {\mu}^{+}{\mu}^{-}\right)/d{q}^2=\left({1.18}_{-0.08}^{+0.09}\pm 0.03\pm 0.27\right)\times {10}^{-7}{\left({\mathrm{GeV}}^2/{c}^4\right)}^{-1}, $$ d Λ b 0 Λ μ + μ / d q 2 = 1.18 0.08 + 0.09 ± 0.03 ± 0.27 × 10 7 GeV 2 / c 4 1 , where the uncertainties are statistical, systematic and due to the normalisation mode, Λ b 0  → J/ψΛ, respectively. In the q 2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A FB ) and hadron (A FB h ) systems are measured for the first time. In the range 15 < q 2 < 20 GeV2 /c 4 they are found to be $$ \begin{array}{l}{A}_{\mathrm{FB}}^{\ell }=-0.05\pm 0.09\left(\mathrm{stat}\right)\pm 0.03\left(\mathrm{syst}\right)\;\mathrm{and}\hfill \\ {}{A}_{\mathrm{FB}}^h=-0.29\pm 0.07\left(\mathrm{stat}\right)\pm 0.03\left(\mathrm{syst}\right).\hfill \end{array} $$ A F B = 0.05 ± 0.09 stat ± 0.03 syst and A F B h = 0.29 ± 0.07 stat ± 0.03 syst .

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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