Study of the ψ2(3823) and χc1(3872) states in B+ → (J/ψπ+π−)K+ 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.,Alves A. A.,Amato S.,Amhis Y.,An L.,Anderlini L.,Andreassi G.,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.,Baker S.,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.,Batozskaya V.,Batsukh B.,Battig A.,Bay A.,Becker M.,Bedeschi F.,Bediaga I.,Beiter A.,Belavin V.,Belin S.,Bellee V.,Belous K.,Belyaev I.,Bencivenni G.,Ben-Haim E.,Berezhnoy A.,Bernet R.,Berninghoff D.,Bernstein H. C.,Bertella C.,Bertholet E.,Bertolin A.,Betancourt C.,Betti F.,Bettler M. O.,Bezshyiko Ia.,Bhasin S.,Bhom J.,Bian L.,Bieker M. S.,Bifani S.,Billoir P.,Bishop F. C. R.,Bizzeti A.,Bjørn M.,Blago M. P.,Blake T.,Blanc F.,Blusk S.,Bobulska D.,Bocci V.,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.,Buchanan E.,Buonaura A.,Burr C.,Bursche A.,Butkevich A.,Butter J. S.,Buytaert J.,Byczynski W.,Cadeddu S.,Cai H.,Calabrese R.,Calero Diaz L.,Cali S.,Calladine R.,Calvi M.,Calvo Gomez M.,Camargo Magalhaes P.,Camboni A.,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.,Carvalho Akiba K.,Casais Vidal A.,Casse G.,Cattaneo M.,Cavallero G.,Celani S.,Cenci R.,Cerasoli J.,Chadwick A. J.,Chapman M. G.,Charles M.,Charpentier Ph.,Chatzikonstantinidis G.,Chefdeville M.,Chen C.,Chen S.,Chernov A.,Chitic S.-G.,Chobanova V.,Cholak S.,Chrzaszcz M.,Chubykin A.,Chulikov V.,Ciambrone P.,Cicala M. F.,Cid Vidal X.,Ciezarek G.,Cindolo F.,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.,Contu A.,Cooke N.,Coombs G.,Coquereau S.,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.,Dean W.,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 Canto A.,Di Nezza P.,Didenko S.,Dijkstra H.,Dobishuk V.,Donohoe A. M.,Dordei F.,Dorigo M.,dos Reis A. C.,Douglas L.,Dovbnya A.,Downes A. G.,Dreimanis K.,Dudek M. W.,Dufour L.,Durante P.,Durham J. M.,Dutta D.,Dziewiecki M.,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.,Farley N.,Farry S.,Fazzini D.,Fedin P.,Féo M.,Fernandez Declara P.,Fernandez Prieto A.,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.,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.,Gallorini S.,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.,Gascon D.,Gaspar C.,Geertsema R. E.,Gerick D.,Gersabeck E.,Gersabeck M.,Gershon T.,Gerstel D.,Ghez Ph.,Gibson V.,Gioventù A.,Gironella Gironell P.,Giubega L.,Giugliano C.,Gizdov K.,Gligorov V. V.,Göbel C.,Golobardes E.,Golubkov D.,Golutvin A.,Gomes A.,Goncerz M.,Gorbounov P.,Gorelov I. V.,Gotti C.,Govorkova E.,Grabowski J. P.,Graciani Diaz R.,Grammatico T.,Granado Cardoso L. A.,Graugés E.,Graverini E.,Graziani G.,Grecu A.,Greeven L. M.,Griffith P.,Grillo L.,Gruber L.,Gruberg Cazon B. R.,Gu C.,Guarise M.,Günther P. A.,Gushchin E.,Guth A.,Guz Yu.,Gys T.,Hadavizadeh T.,Haefeli G.,Haen C.,Haines S. C.,Hamilton P. M.,Han Q.,Han X.,Hancock T. H.,Hansmann-Menzemer S.,Harnew N.,Harrison T.,Hart R.,Hasse C.,Hatch M.,He J.,Hecker M.,Heijhoff K.,Heinicke K.,Hennequin A. M.,Hennessy K.,Henry L.,Heuel J.,Hicheur A.,Hill D.,Hilton M.,Hollitt S. E.,Hopchev P. H.,Hu J.,Hu J.,Hu W.,Huang W.,Hulsbergen W.,Humair T.,Hunter R. J.,Hushchyn M.,Hutchcroft D.,Hynds D.,Ibis P.,Idzik M.,Ilin D.,Ilten P.,Inglessi A.,Ivshin K.,Jacobsson R.,Jakobsen S.,Jans E.,Jashal B. K.,Jawahery A.,Jevtic V.,Jiang F.,John M.,Johnson D.,Jones C. R.,Jones T. P.,Jost B.,Jurik N.,Kandybei S.,Kang Y.,Karacson M.,Kariuki J. M.,Kazeev N.,Kecke M.,Keizer F.,Kelsey M.,Kenzie M.,Ketel T.,Khanji B.,Kharisova A.,Kim K. E.,Kirn T.,Kirsebom V. S.,Kitouni O.,Klaver S.,Klimaszewski K.,Koliiev S.,Kondybayeva A.,Konoplyannikov A.,Kopciewicz P.,Kopecna R.,Koppenburg P.,Korolev M.,Kostiuk I.,Kot O.,Kotriakhova S.,Kravchenko P.,Kravchuk L.,Krawczyk R. D.,Kreps M.,Kress F.,Kretzschmar S.,Krokovny P.,Krupa W.,Krzemien W.,Kucewicz W.,Kucharczyk M.,Kudryavtsev V.,Kuindersma H. S.,Kunde G. J.,Kvaratskheliya T.,Lacarrere D.,Lafferty G.,Lai A.,Lampis A.,Lancierini D.,Lane J. J.,Lane R.,Lanfranchi G.,Langenbruch C.,Lantwin O.,Latham T.,Lazzari F.,Le Gac R.,Lee S. H.,Lefèvre R.,Leflat A.,Leroy O.,Lesiak T.,Leverington B.,Li H.,Li L.,Li P.,Li X.,Li Y.,Li Y.,Li Z.,Liang X.,Lin T.,Lindner R.,Lisovskyi V.,Litvinov R.,Liu G.,Liu H.,Liu S.,Liu X.,Loi A.,Lomba Castro J.,Longstaff I.,Lopes J. H.,Loustau G.,Lovell G. H.,Lu Y.,Lucchesi D.,Luchuk S.,Lucio Martinez M.,Lukashenko V.,Luo Y.,Lupato A.,Luppi E.,Lupton O.,Lusiani A.,Lyu X.,Ma L.,Maccolini S.,Machefert F.,Maciuc F.,Macko V.,Mackowiak P.,Maddrell-Mander S.,Madhan Mohan L. R.,Maev O.,Maevskiy A.,Maisuzenko D.,Majewski M. W.,Malde S.,Malecki B.,Malinin A.,Maltsev T.,Malygina H.,Manca G.,Mancinelli G.,Manera Escalero R.,Manuzzi D.,Marangotto D.,Maratas J.,Marchand J. F.,Marconi U.,Mariani S.,Marin Benito C.,Marinangeli M.,Marino P.,Marks J.,Marshall P. J.,Martellotti G.,Martinazzoli L.,Martinelli M.,Martinez Santos D.,Martinez Vidal F.,Massafferri A.,Materok M.,Matev R.,Mathad A.,Mathe Z.,Matiunin V.,Matteuzzi C.,Mattioli K. R.,Mauri A.,Maurice E.,Mazurek M.,McCann M.,Mcconnell L.,Mcgrath T. H.,McNab A.,McNulty R.,Mead J. V.,Meadows B.,Meaux C.,Meier G.,Meinert N.,Melnychuk D.,Meloni S.,Merk M.,Merli A.,Meyer Garcia L.,Mikhasenko M.,Milanes D. A.,Millard E.,Minard M.-N.,Mineev O.,Minzoni L.,Mitchell S. E.,Mitreska B.,Mitzel D. S.,Mödden A.,Mohammed R. A.,Moise R. D.,Mombächer T.,Monroy I. A.,Monteil S.,Morandin M.,Morello G.,Morello M. J.,Moron J.,Morris A. B.,Morris A. G.,Mountain R.,Mu H.,Muheim F.,Mukherjee M.,Mulder M.,Müller D.,Müller K.,Murphy C. H.,Murray D.,Muzzetto P.,Naik P.,Nakada T.,Nandakumar R.,Nanut T.,Nasteva I.,Needham M.,Neri I.,Neri N.,Neubert S.,Neufeld N.,Newcombe R.,Nguyen T. D.,Nguyen-Mau C.,Niel E. M.,Nieswand S.,Nikitin N.,Nolte N. S.,Nunez C.,Oblakowska-Mucha A.,Obraztsov V.,Ogilvy S.,O’Hanlon D. P.,Oldeman R.,Onderwater C. J. G.,Osborn J. D.,Ossowska A.,Otalora Goicochea J. M.,Ovsiannikova T.,Owen P.,Oyanguren A.,Pagare B.,Pais P. R.,Pajero T.,Palano A.,Palutan M.,Pan Y.,Panshin G.,Papanestis A.,Pappagallo M.,Pappalardo L. L.,Pappenheimer C.,Parker W.,Parkes C.,Parkinson C. J.,Passaleva G.,Pastore A.,Patel M.,Patrignani C.,Pearce A.,Pellegrino A.,Pepe Altarelli M.,Perazzini S.,Pereima D.,Perret P.,Petridis K.,Petrolini A.,Petrov A.,Petrucci S.,Petruzzo M.,Philippov A.,Pica L.,Pietrzyk B.,Pietrzyk G.,Pili M.,Pinci D.,Pinzino J.,Pisani F.,Piucci A.,Placinta V.,Playfer S.,Plews J.,Plo Casasus M.,Polci F.,Poli Lener M.,Poliakova M.,Poluektov A.,Polukhina N.,Polyakov I.,Polycarpo E.,Pomery G. J.,Ponce S.,Popov A.,Popov D.,Popov S.,Poslavskii S.,Prasanth K.,Promberger L.,Prouve C.,Pugatch V.,Puig Navarro A.,Pullen H.,Punzi G.,Qian W.,Qin J.,Quagliani R.,Quintana B.,Raab N. V.,Rabadan Trejo R. I.,Rachwal B.,Rademacker J. H.,Rama M.,Ramos Pernas M.,Rangel M. S.,Ratnikov F.,Raven G.,Reboud M.,Redi F.,Reiss F.,Remon Alepuz C.,Ren Z.,Renaudin V.,Ribatti R.,Ricciardi S.,Richards D. S.,Rinnert K.,Robbe P.,Robert A.,Robertson G.,Rodrigues A. B.,Rodrigues E.,Rodriguez Lopez J. 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G.,Smetkina A.,Smith E.,Smith M.,Snoch A.,Soares M.,Soares Lavra L.,Sokoloff M. D.,Soler F. J. P.,Solovev A.,Solovyev I.,Souza De Almeida F. L.,Souza De Paula B.,Spaan B.,Spadaro Norella E.,Spradlin P.,Stagni F.,Stahl M.,Stahl S.,Stefko P.,Steinkamp O.,Stemmle S.,Stenyakin O.,Stevens H.,Stone S.,Stracka S.,Stramaglia M. E.,Straticiuc M.,Strekalina D.,Strokov S.,Suljik F.,Sun J.,Sun L.,Sun Y.,Svihra P.,Swallow P. N.,Swientek K.,Szabelski A.,Szumlak T.,Szymanski M.,Taneja S.,Tang Z.,Tekampe T.,Teubert F.,Thomas E.,Thomson K. A.,Tilley M. J.,Tisserand V.,T’Jampens S.,Tobin M.,Tolk S.,Tomassetti L.,Torres Machado D.,Tou D. Y.,Traill M.,Tran M. T.,Trifonova E.,Trippl C.,Tsaregorodtsev A.,Tuci G.,Tully A.,Tuning N.,Ukleja A.,Unverzagt D. J.,Usachov A.,Ustyuzhanin A.,Uwer U.,Vagner A.,Vagnoni V.,Valassi A.,Valenti G.,van Beuzekom M.,Van Hecke H.,van Herwijnen E.,Van Hulse C. B.,van Veghel M.,Vazquez Gomez R.,Vazquez Regueiro P.,Vázquez Sierra C.,Vecchi S.,Velthuis J. 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Abstract

Abstract The decays B+ J/ψπ+πK+ are studied using a data set corresponding to an integrated luminosity of 9 fb1 collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate ψ2(3823), χc1(3872) and ψ(2S) states are reported. The values are$$ {\displaystyle \begin{array}{c}\frac{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\uppsi}_2(3823){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi_2(3823)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\upchi}_{\mathrm{c}1}(3872){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\upchi_{\mathrm{c}1}(3872)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}=\left(3.56\pm 0.67\pm 0.11\right)\times {10}^{-2},\\ {}\frac{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\uppsi}_2(3823){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi_2(3823)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}{{\mathcal{B}}_{{\mathrm{B}}^{+}\to \uppsi \left(2\mathrm{S}\right){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi \left(2\mathrm{S}\right)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}=\left(1.31\pm 0.25\pm 0.04\right)\times {10}^{-3},\\ {}\frac{{\mathcal{B}}_{\mathrm{B}+\to {\upchi}_{\mathrm{c}1}(3872){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\upchi_{\mathrm{c}1}(3872)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}{{\mathcal{B}}_{{\mathrm{B}}^{+}\to \uppsi \left(2\mathrm{S}\right){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi \left(2\mathrm{S}\right)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}=\left(3.69\pm 0.07\pm 0.06\right)\times {10}^{-2},\end{array}} $$ B B + ψ 2 3823 K + × B ψ 2 3823 J / ψπ + π B B + χ c 1 3872 K + × B χ c 1 3872 J / ψπ + π = 3.56 ± 0.67 ± 0.11 × 10 2 , B B + ψ 2 3823 K + × B ψ 2 3823 J / ψπ + π B B + ψ 2 S K + × B ψ 2 S J / ψπ + π = 1.31 ± 0.25 ± 0.04 × 10 3 , B B + χ c 1 3872 K + × B χ c 1 3872 J / ψπ + π B B + ψ 2 S K + × B ψ 2 S J / ψπ + π = 3.69 ± 0.07 ± 0.06 × 10 2 , where the first uncertainty is statistical and the second is systematic. The decay of B+ ψ2(3823)K+ with ψ2(3823) J/ψπ+π is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the ψ2(3823), χc1(3872) and ψ(2S) states are measured to be$$ {\displaystyle \begin{array}{c}{m}_{\upchi_{\mathrm{c}1}(3872)}-{m}_{\uppsi_2(3823)}=47.50\pm 0.53\pm 0.13\;\mathrm{MeV}/{c}^2,\\ {}{m}_{\uppsi_2(3823)}-{m}_{\uppsi_2\left(2\mathrm{S}\right)}=137.98\pm 0.53\pm 0.14\;\mathrm{MeV}/{c}^2,\\ {}{m}_{\upchi_{\mathrm{c}1}(3872)}-{m}_{\uppsi_2\left(2\mathrm{S}\right)}=185.49\pm 0.06\pm 0.03\;\mathrm{MeV}/{c}^2,\end{array}} $$ m χ c 1 3872 m ψ 2 3823 = 47.50 ± 0.53 ± 0.13 MeV / c 2 , m ψ 2 3823 m ψ 2 2 S = 137.98 ± 0.53 ± 0.14 MeV / c 2 , m χ c 1 3872 m ψ 2 2 S = 185.49 ± 0.06 ± 0.03 MeV / c 2 , resulting in the most precise determination of the χc1(3872) mass. The width of the ψ2(3823) state is found to be below 5.2 MeV at 90% confidence level. The Breit-Wigner width of the χc1(3872) state is measured to be$$ {\Gamma}_{\upchi_{\mathrm{c}1}(3872)}^{\mathrm{BW}}={0.96}_{-0.18}^{+0.19}\pm 0.21\;\mathrm{MeV} $$ Γ χ c 1 3872 BW = 0.96 0.18 + 0.19 ± 0.21 MeV which is inconsistent with zero by 5.5 standard deviations.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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