对一个激发态\(B_{c}^{+}\)介子的观测
Observation of an Excited B_{c}^{+} State.
作者信息
Aaij R, Abellán Beteta C, Adeva B, Adinolfi M, Aidala C A, Ajaltouni Z, Akar S, Albicocco P, Albrecht J, Alessio F, Alexander M, Alfonso Albero A, Alkhazov G, Alvarez Cartelle P, Alves A A, Amato S, Amhis Y, An L, Anderlini L, Andreassi G, Andreotti M, Andrews J E, Archilli F, d'Argent P, Arnau Romeu J, Artamonov A, Artuso M, Arzymatov K, Aslanides E, Atzeni M, Audurier B, Bachmann S, Back J J, Baker S, Balagura V, Baldini W, Baranov A, Barlow R J, Barsuk S, Barter W, Bartolini M, Baryshnikov F, Batozskaya V, Batsukh B, Battig A, Battista V, Bay A, Bedeschi F, Bediaga I, Beiter A, Bel L J, Belin S, Beliy N, Bellee V, Belloli N, Belous K, Ben-Haim E, Bencivenni G, Benson S, Beranek S, Berezhnoy A, Bernet R, Berninghoff D, Bertholet E, Bertolin A, Betancourt C, Betti F, Bettler M O, van Beuzekom M, Bezshyiko Ia, Bhasin S, Bhom J, Bieker M S, Bifani S, Billoir P, Birnkraut A, Bizzeti A, Bjørn M, Blago M P, Blake T, Blanc F, Blusk S, Bobulska D, Bocci V, Boente Garcia O, Boettcher T, Bondar A, Bondar N, Borghi S, Borisyak M, Borsato M, Boubdir M, Bowcock T J V, Bozzi C, Braun S, Brodski M, Brodzicka J, Brossa Gonzalo A, Brundu D, Buchanan E, Buonaura A, Burr C, Bursche A, Buytaert J, Byczynski W, Cadeddu S, Cai H, Calabrese R, Cali S, Calladine R, Calvi M, Calvo Gomez M, Camboni A, Campana P, Campora Perez D H, Capriotti L, Carbone A, Carboni G, Cardinale R, Cardini A, Carniti P, Carvalho Akiba K, Casse G, Cattaneo M, Cavallero G, Cenci R, Chapman M G, Charles M, Charpentier Ph, Chatzikonstantinidis G, Chefdeville M, Chekalina V, Chen C, Chen S, Chitic S-G, Chobanova V, Chrzaszcz M, Chubykin A, Ciambrone P, Cid Vidal X, Ciezarek G, Cindolo F, Clarke P E L, Clemencic M, Cliff H V, Closier J, Coco V, Coelho J A B, Cogan J, Cogneras E, Cojocariu L, Collins P, Colombo T, Comerma-Montells A, Contu A, Coombs G, Coquereau S, Corti G, Costa Sobral C M, Couturier B, Cowan G A, Craik D C, Crocombe A, Cruz Torres M, Currie R, D'Ambrosio C, Da Silva C L, Dall'Occo E, Dalseno J, Danilina A, 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 P, Dean C T, Dean W, Decamp D, Del Buono L, Delaney B, Dembinski H-P, Demmer M, Dendek A, Derkach D, Deschamps O, Desse F, Dettori F, Dey B, Di Canto A, Di Nezza P, Didenko S, Dijkstra H, Dordei F, Dorigo M, Dosil Suárez A, Douglas L, Dovbnya A, Dreimanis K, Dufour L, Dujany G, Durante P, Durham J M, Dutta D, Dzhelyadin R, Dziewiecki M, Dziurda A, Dzyuba A, Easo S, Egede U, Egorychev V, Eidelman S, Eisenhardt S, Eitschberger U, Ekelhof R, Eklund L, Ely S, Ene A, Escher S, Esen S, Evans T, Falabella A, Farley N, Farry S, Fazzini D, Fernandez Declara P, Fernandez Prieto A, Ferrari F, Ferreira Lopes L, Ferreira Rodrigues F, Ferreres Sole S, Ferro-Luzzi M, Filippov S, Fini R A, Fiorini M, Firlej M, Fitzpatrick C, Fiutowski T, Fleuret F, Fontana M, Fontanelli F, Forty R, Franco Lima V, Frank M, Frei C, Fu J, Funk W, Färber C, Féo M, Gabriel E, Gallas Torreira A, Galli D, Gallorini S, Gambetta S, Gan Y, Gandelman M, Gandini P, Gao Y, Garcia Martin L M, Garcia Plana B, García Pardiñas J, Garra Tico J, Garrido L, Gascon D, Gaspar C, Gazzoni G, Gerick D, Gersabeck E, Gersabeck M, Gershon T, Gerstel D, Ghez Ph, Gibson V, Girard O G, Gironella Gironell P, Giubega L, Gizdov K, Gligorov V V, Golubkov D, Golutvin A, Gomes A, Gorelov I V, Gotti C, Govorkova E, Grabowski J P, Graciani Diaz R, Granado Cardoso L A, Graugés E, Graverini E, Graziani G, Grecu A, Greim R, Griffith P, Grillo L, Gruber L, Gruberg Cazon B R, Gu C, Guo X, Gushchin E, Guth A, Guz Yu, Gys T, Göbel C, Hadavizadeh T, Hadjivasiliou C, Haefeli G, Haen C, Haines S C, Hamilton B, Han Q, Han X, Hancock T H, Hansmann-Menzemer S, Harnew N, Harrison T, Hasse C, Hatch M, He J, Hecker M, Heinicke K, Heister A, Hennessy K, Henry L, van Herwijnen E, Heuel J, Heß M, Hicheur A, Hidalgo Charman R, Hill D, Hilton M, Hopchev P H, Hu J, Hu W, Huang W, Huard Z C, Hulsbergen W, Humair T, Hushchyn M, Hutchcroft D, Hynds D, Ibis P, Idzik M, Ilten P, Inglessi A, Inyakin A, Ivshin K, Jacobsson R, Jakobsen S, Jalocha J, Jans E, Jashal B K, Jawahery A, Jiang F, John M, Johnson D, Jones C R, Joram C, Jost B, Jurik N, Kandybei S, Karacson M, Kariuki J M, Karodia S, Kazeev N, Kecke M, Keizer F, Kelsey M, Kenzie M, Ketel T, Khanji B, Kharisova A, Khurewathanakul C, Kim K E, Kirn T, Kirsebom V S, Klaver S, Klimaszewski K, Koliiev S, Kolpin M, Kopecna R, Koppenburg P, Kostiuk I, Kotriakhova S, Kozeiha M, Kravchuk L, Kreps M, Kress F, Kretzschmar S, Krokovny P, Krupa W, Krzemien W, Kucewicz W, Kucharczyk M, Kudryavtsev V, Kunde G J, Kuonen A K, Kvaratskheliya T, Lacarrere D, Lafferty G, Lai A, Lancierini D, Lanfranchi G, Langenbruch C, Latham T, Lazzeroni C, Le Gac R, Leflat A, Lefèvre R, Lemaitre F, Leroy O, Lesiak T, Leverington B, Li H, Li P-R, Li X, Li Y, Li Z, Liang X, Likhomanenko T, Lindner R, Ling P, Lionetto F, Lisovskyi V, Liu G, Liu X, Loh D, Loi A, Longstaff I, Lopes J H, Loustau G, Lovell G H, Lucchesi D, Lucio Martinez M, Luo Y, Lupato A, Luppi E, Lupton O, Lusiani A, Lyu X, Ma R, Machefert F, Maciuc F, Macko V, Mackowiak P, Maddrell-Mander S, Maev O, Maguire K, Maisuzenko D, Majewski M W, Malde S, Malecki B, Malinin A, Maltsev T, Malygina H, Manca G, Mancinelli G, Marangotto D, Maratas J, Marchand J F, Marconi U, Marin Benito C, Marinangeli M, Marino P, Marks J, Marshall P J, Martellotti G, 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, Maurin B, McCann M, McNab A, McNulty R, Mead J V, Meadows B, Meaux C, Meinert N, Melnychuk D, Merk M, Merli A, Michielin E, Milanes D A, Millard E, Minard M-N, Minzoni L, Mitzel D S, Mogini A, Moise R D, Mombächer T, Monroy I A, Monteil S, Morandin M, Morello G, Morello M J, Moron J, Morris A B, Mountain R, Muheim F, Mukherjee M, Mulder M, Murphy C H, Murray D, Mödden A, Müller D, Müller J, Müller K, Müller V, Naik P, Nakada T, Nandakumar R, Nandi A, Nanut T, Nasteva I, Needham M, Neri N, Neubert S, Neufeld N, Newcombe R, Nguyen T D, Nguyen-Mau C, Nieswand S, Niet R, Nikitin N, Nolte N S, O'Hanlon D P, Oblakowska-Mucha A, Obraztsov V, Ogilvy S, Oldeman R, Onderwater C J G, Osborn J D, Ossowska A, Otalora Goicochea J M, Ovsiannikova T, Owen P, Oyanguren A, Pais P R, Pajero T, Palano A, Palutan M, Panshin G, Papanestis A, Pappagallo M, Pappalardo L L, Parker W, Parkes C, Passaleva G, Pastore A, Patel M, Patrignani C, Pearce A, Pellegrino A, Penso G, Pepe Altarelli M, Perazzini S, Pereima D, Perret P, Pescatore L, Petridis K, Petrolini A, Petrov A, Petrucci S, Petruzzo M, Pietrzyk B, Pietrzyk G, Pikies M, 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, Poslavskii S, Price E, Prouve C, Pugatch V, Puig Navarro A, Pullen H, Punzi G, Qian W, Qin J, Quagliani R, Quintana B, Raab N V, Rachwal B, Rademacker J H, Rama M, Ramos Pernas M, Rangel M S, Ratnikov F, Raven G, Ravonel Salzgeber M, Reboud M, Redi F, Reichert S, Dos Reis A C, Reiss F, Remon Alepuz C, Ren Z, Renaudin V, Ricciardi S, Richards S, Rinnert K, Robbe P, Robert A, Rodrigues A B, Rodrigues E, Rodriguez Lopez J A, Roehrken M, Roiser S, Rollings A, Romanovskiy V, Romero Vidal A, Roth J D, Rotondo M, Rudolph M S, Ruf T, Ruiz Vidal J, Saborido Silva J J, Sagidova N, Saitta B, Salustino Guimaraes V, Sanchez Gras C, Sanchez Mayordomo C, Sanmartin Sedes B, Santacesaria R, Santamarina Rios C, Santimaria M, Santovetti E, Sarpis G, Sarti A, Satriano C, Satta A, Saur M, Savrina D, Schael S, Schellenberg M, Schiller M, Schindler H, Schmelling M, Schmelzer T, Schmidt B, Schneider O, Schopper A, Schreiner H F, Schubiger M, Schulte S, Schune M H, Schwemmer R, Sciascia B, Sciubba A, Semennikov A, Sepulveda E S, Sergi A, Serra N, Serrano J, Sestini L, Seuthe A, Seyfert P, Shapkin M, Shears T, Shekhtman L, Shevchenko V, Shmanin E, Siddi B G, Silva Coutinho R, Silva de Oliveira L, Simi G, Simone S, Skiba I, Skidmore N, Skwarnicki T, Slater M W, Smeaton J G, Smith E, Smith I T, Smith M, Soares M, Soares Lavra L, Sokoloff M D, Soler F J P, Souza De Paula B, Spaan B, Spadaro Norella E, Spradlin P, Stagni F, Stahl M, Stahl S, Stefko P, Stefkova S, Steinkamp O, Stemmle S, Stenyakin O, Stepanova M, Stevens H, Stocchi A, Stone S, Stracka S, Stramaglia M E, Straticiuc M, Straumann U, Strokov S, Sun J, Sun L, Sun Y, Swientek K, Szabelski A, Szumlak T, Szymanski M, T'Jampens S, Tang Z, Tekampe T, Tellarini G, Teubert F, Thomas E, van Tilburg J, Tilley M J, Tisserand V, Tobin M, Tolk S, Tomassetti L, Tonelli D, Tou D Y, Tourinho Jadallah Aoude R, Tournefier E, Traill M, Tran M T, Trisovic A, Tsaregorodtsev A, Tuci G, Tully A, Tuning N, Ukleja A, Usachov A, Ustyuzhanin A, Uwer U, Vagner A, Vagnoni V, Valassi A, Valat S, Valenti G, Van Hecke H, Van Hulse C B, Vasiliev A, Vazquez Gomez R, Vazquez Regueiro P, Vecchi S, van Veghel M, Velthuis J J, Veltri M, Venkateswaran A, Vernet M, Veronesi M, Vesterinen M, Viana Barbosa J V, Vieira D, Vieites Diaz M, Viemann H, Vilasis-Cardona X, Vitkovskiy A, Vitti M, Volkov V, Vollhardt A, Vom Bruch D, Voneki B, Vorobyev A, Vorobyev V, Voropaev N, de Vries J A, Vázquez Sierra C, Waldi R, Walsh J, Wang J, Wang M, Wang Y, Wang Z, Ward D R, Wark H M, Watson N K, Websdale D, Weiden A, Weisser C, Whitehead M, Wilkinson G, Wilkinson M, Williams I, Williams M R J, Williams M, Williams T, Wilson F F, Winn M, Wislicki W, Witek M, Wormser G, Wotton S A, Wyllie K, Xiao D, Xie Y, Xing H, Xu A, Xu M, Xu Q, Xu Z, Xu Z, Yang Z, Yang Z, Yao Y, Yeomans L E, Yin H, Yu J, Yuan X, Yushchenko O, Zarebski K A, Zavertyaev M, Zeng M, Zhang D, Zhang L, Zhang W C, Zhang Y, Zhelezov A, Zheng Y, Zhu X, Zhukov V, Zonneveld J B, Zucchelli S
机构信息
Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
出版信息
Phys Rev Lett. 2019 Jun 14;122(23):232001. doi: 10.1103/PhysRevLett.122.232001.
Using pp collision data corresponding to an integrated luminosity of 8.5 fb^{-1} recorded by the LHCb experiment at center-of-mass energies of sqrt[s]=7, 8, and 13 TeV, the observation of an excited B_{c}^{+} state in the B_{c}^{+}π^{+}π^{-} invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(B_{c}^{+}) MeV/c^{2}, where the last uncertainty is due to the limited knowledge of the B_{c}^{+} mass. It is consistent with expectations of the B_{c}^{}(2^{3}S_{1})^{+} state reconstructed without the low-energy photon from the B_{c}^{}(1^{3}S_{1})^{+}→B_{c}^{+}γ decay following B_{c}^{}(2^{3}S_{1})^{+}→B_{c}^{}(1^{3}S_{1})^{+}π^{+}π^{-}. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(B_{c}^{+}) MeV/c^{2}, and is consistent with the B_{c}(2^{1}S_{0})^{+} state. These mass measurements are the most precise to date.
利用大型强子对撞机底夸克实验（LHCb）在质心能量(\sqrt{s}=7)、(8)和(13) TeV下记录的对应于(8.5,\text{fb}^{-1})积分亮度的质子-质子碰撞数据，报告了在(B_{c}^{+}\pi^{+}\pi^{-})不变质量谱中对激发态(B_{c}^{+})的观测。观测到的峰值质量为(6841.2\pm0.6)（统计）(\pm0.1)（系统）(\pm0.8)（(B_{c}^{+})）(\text{MeV}/c^{2})，其中最后一项不确定性是由于对(B_{c}^{+})质量的了解有限所致。它与在(B_{c}^{}(2^{3}S_{1})^{+}\to B_{c}^{}(1^{3}S_{1})^{+}\pi^{+}\pi^{-})之后，不包括来自(B_{c}^{}(1^{3}S_{1})^{+}\to B_{c}^{+}\gamma)衰变的低能光子而重建的(B_{c}^{}(2^{3}S_{1})^{+})态的预期相符。还观测到第二个态，其全局（局部）统计显著性为(2.2\sigma)（(3.2\sigma)），质量为(6872.1\pm1.3)（统计）(\pm0.1)（系统）(\pm0.8)（(B_{c}^{+})）(\text{MeV}/c^{2})，并且与(B_{c}(2^{1}S_{0})^{+})态相符。这些质量测量是迄今为止最精确的。
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