Aaij R, Adeva B, Adinolfi M, Ajaltouni Z, Akar S, Albrecht J, Alessio F, Alexander M, Alfonso Albero A, Ali S, Alkhazov G, Alvarez Cartelle P, Alves A A, Amato S, Amerio S, Amhis Y, An L, Anderlini L, Andreassi G, Andreotti M, Andrews J E, Appleby R B, Archilli F, d'Argent P, Arnau Romeu J, Artamonov A, Artuso M, Aslanides E, Atzeni M, Auriemma G, Baalouch M, Babuschkin I, Bachmann S, Back J J, Badalov A, Baesso C, Baker S, Balagura V, Baldini W, Baranov A, Barlow R J, Barschel C, Barsuk S, Barter W, Baryshnikov F, Batozskaya V, Battista V, Bay A, Beaucourt L, Beddow J, Bedeschi F, Bediaga I, Beiter A, Bel L J, Beliy N, Bellee V, Belloli N, Belous K, Belyaev I, 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, Bifani S, Billoir P, Birnkraut A, Bizzeti A, Bjørn M, Blake T, Blanc F, Blusk S, Bocci V, Boettcher T, Bondar A, Bondar N, Bordyuzhin I, Borghi S, Borisyak M, Borsato M, Bossu F, Boubdir M, Bowcock T J V, Bowen E, Bozzi C, Braun S, Britton T, Brodzicka J, Brundu D, Buchanan E, Burr C, Bursche A, Buytaert J, Byczynski W, Cadeddu S, Cai H, Calabrese R, 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, Carson L, Carvalho Akiba K, Casse G, Cassina L, Cattaneo M, Cavallero G, Cenci R, Chamont D, Chapman M G, Charles M, Charpentier Ph, Chatzikonstantinidis G, Chefdeville M, Chen S, Cheung S F, Chitic S-G, Chobanova V, Chrzaszcz M, Chubykin A, Ciambrone P, Cid Vidal X, Ciezarek G, Clarke P E L, Clemencic M, Cliff H V, Closier J, Cogan J, Cogneras E, Cogoni V, Cojocariu L, Collins P, Colombo T, Comerma-Montells A, Contu A, Cook A, Coombs G, Coquereau S, Corti G, Corvo M, Costa Sobral C M, Couturier B, Cowan G A, Craik D C, Crocombe A, Cruz Torres M, Currie R, D'Ambrosio C, Da Cunha Marinho F, Dall'Occo E, Dalseno J, Davis A, De Aguiar Francisco O, De Capua S, De Cian M, De Miranda J M, De Paula L, De Serio M, De Simone P, Dean C T, Decamp D, Del Buono L, Dembinski H-P, Demmer M, Dendek A, Derkach D, Deschamps O, Dettori F, Dey B, Di Canto A, Di Nezza P, Dijkstra H, Dordei F, Dorigo M, Dosil Suárez A, Douglas L, Dovbnya A, Dreimanis K, Dufour L, Dujany G, Durante P, Dzhelyadin R, Dziewiecki M, Dziurda A, Dzyuba A, Easo S, Ebert M, Egede U, Egorychev V, Eidelman S, Eisenhardt S, Eitschberger U, Ekelhof R, Eklund L, Ely S, Esen S, Evans H M, Evans T, Falabella A, Farley N, Farry S, Fazzini D, Federici L, Ferguson D, Fernandez G, Fernandez Declara P, Fernandez Prieto A, Ferrari F, Ferreira Rodrigues F, Ferro-Luzzi M, Filippov S, Fini R A, Fiorini M, Firlej M, Fitzpatrick C, Fiutowski T, Fleuret F, Fohl K, Fontana M, Fontanelli F, Forshaw D C, Forty R, Franco Lima V, Frank M, Frei C, Fu J, Funk W, Furfaro E, Färber C, Gabriel E, Gallas Torreira A, Galli D, Gallorini S, Gambetta S, Gandelman M, Gandini P, Gao Y, Garcia Martin L M, García Pardiñas J, Garra Tico J, Garrido L, Garsed P J, Gascon D, Gaspar C, Gavardi L, Gazzoni G, Gerick D, Gersabeck E, Gersabeck M, Gershon T, Ghez Ph, Gianì S, Gibson V, Girard O G, 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, Grünberg O, Gushchin E, Guz Yu, Gys T, Göbel C, Hadavizadeh T, Hadjivasiliou C, Haefeli G, Haen C, Haines S C, Hamilton B, Han X, Hancock T H, Hansmann-Menzemer S, Harnew N, Harnew S T, Hasse C, Hatch M, He J, Hecker M, Heinicke K, Heister A, Hennessy K, Henrard P, Henry L, van Herwijnen E, Heß M, Hicheur A, Hill D, Hombach C, Hopchev P H, Hu W, Huard Z C, Hulsbergen W, Humair T, Hushchyn M, Hutchcroft D, Ibis P, Idzik M, Ilten P, Jacobsson R, Jalocha J, Jans E, 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, Khairullin E, Khanji B, Khurewathanakul C, Kirn T, Klaver S, Klimaszewski K, Klimkovich T, Koliiev S, Kolpin M, Kopecna R, Koppenburg P, Kosmyntseva A, Kotriakhova S, Kozeiha M, Kravchuk L, Kreps M, Kress F, Krokovny P, Kruse F, Krzemien W, Kucewicz W, Kucharczyk M, Kudryavtsev V, Kuonen A K, Kvaratskheliya T, Lacarrere D, Lafferty G, Lai A, Lanfranchi G, Langenbruch C, Latham T, Lazzeroni C, Le Gac R, Leflat A, Lefrançois J, Lefèvre R, Lemaitre F, Lemos Cid E, Leroy O, Lesiak T, Leverington B, Li P-R, Li T, Li Y, Li Z, Likhomanenko T, Lindner R, Lionetto F, Lisovskyi V, Liu X, Loh D, Loi A, Longstaff I, Lopes J H, Lucchesi D, Luchinsky A, Lucio Martinez M, Luo H, Lupato A, Luppi E, Lupton O, Lusiani A, Lyu X, 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, Manca G, Mancinelli G, Marangotto D, Maratas J, Marchand J F, Marconi U, Marin Benito C, Marinangeli M, Marino P, Marks J, Martellotti G, Martin M, Martinelli M, Martinez Santos D, Martinez Vidal F, Massacrier L M, Massafferri A, Matev R, Mathad A, Mathe Z, Matteuzzi C, Mauri A, Maurice E, Maurin B, Mazurov A, McCann M, McNab A, McNulty R, Mead J V, Meadows B, Meaux C, Meier F, 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, Molina Rodriguez J, Mombächer T, Monroy I A, Monteil S, Morandin M, Morello M J, Morgunova O, Moron J, Morris A B, Mountain R, Muheim F, Mulder M, Müller D, Müller J, Müller K, Müller V, Naik P, Nakada T, Nandakumar R, Nandi A, Nasteva I, Needham M, Neri N, Neubert S, Neufeld N, Neuner M, Nguyen T D, Nguyen-Mau C, Nieswand S, Niet R, Nikitin N, Nikodem T, Nogay A, O'Hanlon D P, Oblakowska-Mucha A, Obraztsov V, Ogilvy S, Oldeman R, Onderwater C J G, Ossowska A, Otalora Goicochea J M, Owen P, Oyanguren A, Pais P R, Palano A, Palutan M, 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, Perret P, Pescatore L, Petridis K, Petrolini A, Petrov A, Petruzzo M, Picatoste Olloqui E, Pietrzyk B, Pikies M, Pinci D, Pisani F, Pistone A, Piucci A, Placinta V, Playfer S, Plo Casasus M, Polci F, Poli Lener M, Poluektov A, Polyakov I, Polycarpo E, Pomery G J, Ponce S, Popov A, Popov D, Poslavskii S, Potterat C, Price E, Prisciandaro J, Prouve C, Pugatch V, Puig Navarro A, Pullen H, Punzi G, Qian W, Quagliani R, Quintana B, Rachwal B, Rademacker J H, Rama M, Ramos Pernas M, Rangel M S, Raniuk I, Ratnikov F, Raven G, Ravonel Salzgeber M, Reboud M, Redi F, Reichert S, Dos Reis A C, Remon Alepuz C, Renaudin V, Ricciardi S, Richards S, Rihl M, Rinnert K, Rives Molina V, Robbe P, Robert A, Rodrigues A B, Rodrigues E, Rodriguez Lopez J A, Rogozhnikov A, Roiser S, Rollings A, Romanovskiy V, Romero Vidal A, Ronayne J W, Rotondo M, Rudolph M S, Ruf T, Ruiz Valls P, Ruiz Vidal J, Saborido Silva J J, Sadykhov E, Sagidova N, Saitta B, Salustino Guimaraes V, Sanchez Mayordomo C, Sanmartin Sedes B, Santacesaria R, Santamarina Rios C, Santimaria M, Santovetti E, Sarpis G, Sarti A, Satriano C, Satta A, Saunders D 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, Schune M-H, Schwemmer R, Sciascia B, Sciubba A, Semennikov A, Sepulveda E S, Sergi A, Serra N, Serrano J, Sestini L, Seyfert P, Shapkin M, Shapoval I, Shcheglov Y, Shears T, Shekhtman L, Shevchenko V, Siddi B G, Silva Coutinho R, Silva de Oliveira L, Simi G, Simone S, Sirendi M, Skidmore N, Skwarnicki T, Smith E, Smith I T, Smith J, Smith M, Soares Lavra L, Sokoloff M D, Soler F J P, Souza De Paula B, Spaan B, Spradlin P, Sridharan S, Stagni F, Stahl M, Stahl S, Stefko P, Stefkova S, Steinkamp O, Stemmle S, Stenyakin O, Stepanova M, Stevens H, Stone S, Storaci B, Stracka S, Stramaglia M E, Straticiuc M, Straumann U, Sun J, Sun L, Sutcliffe W, Swientek K, Syropoulos V, Szumlak T, Szymanski M, T'Jampens S, Tayduganov A, Tekampe T, Tellarini G, Teubert F, Thomas E, van Tilburg J, Tilley M J, Tisserand V, Tobin M, Tolk S, Tomassetti L, Tonelli D, Toriello F, Tourinho Jadallah Aoude R, Tournefier E, Traill M, Tran M T, Tresch M, Trisovic A, Tsaregorodtsev A, Tsopelas P, Tully A, Tuning N, Ukleja A, Usachov A, Ustyuzhanin A, Uwer U, Vacca C, Vagner A, Vagnoni V, Valassi A, Valat S, Valenti G, Vazquez Gomez R, Vazquez Regueiro P, Vecchi S, van Veghel M, Velthuis J J, Veltri M, Veneziano G, Venkateswaran A, Verlage T A, Vernet M, Vesterinen M, Viana Barbosa J V, Viaud B, Vieira D, Vieites Diaz M, Viemann H, Vilasis-Cardona X, Vitti M, Volkov V, Vollhardt A, Voneki B, Vorobyev A, Vorobyev V, Voß C, de Vries J A, Vázquez Sierra C, Waldi R, Wallace C, Wallace R, Walsh J, Wang J, Ward D R, Wark H M, Watson N K, Websdale D, Weiden A, Weisser C, Whitehead M, Wicht J, Wilkinson G, Wilkinson M, Williams M, Williams M P, Williams M, Williams T, Wilson F F, Wimberley J, Winn M, Wishahi J, Wislicki W, Witek M, Wormser G, Wotton S A, Wraight K, Wyllie K, Xie Y, Xu M, Xu Z, Yang Z, Yang Z, Yao Y, Yin H, Yu J, Yuan X, Yushchenko O, Zarebski K A, Zavertyaev M, Zhang L, Zhang Y, Zhelezov A, Zheng Y, Zhu X, Zhukov V, Zonneveld J B, Zucchelli S
European Organization for Nuclear Research (CERN), Geneva, Switzerland.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2017 Dec 1;119(22):221801. doi: 10.1103/PhysRevLett.119.221801. Epub 2017 Nov 28.
The decays χ_{c1}→J/ψμ^{+}μ^{-} and χ_{c2}→J/ψμ^{+}μ^{-} are observed and used to study the resonance parameters of the χ_{c1} and χ_{c2} mesons. The masses of these states are measured to be m(χ_{c1})=3510.71±0.04(stat)±0.09(syst) MeV and m(χ_{c2})=3556.10±0.06(stat)±0.11(syst) MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference m(χ_{c2})-m(χ_{c1})=45.39±0.07(stat)±0.03(syst) MeV. The natural width of the χ_{c2} meson is measured to be Γ(χ_{c2})=2.10±0.20(stat)±0.02(syst) MeV. These results are in good agreement with and have comparable precision to the current world averages.
观测到衰变χ_{c1}→J/ψμ^{+}μ^{-}和χ_{c2}→J/ψμ^{+}μ^{-}，并用于研究χ_{c1}和χ_{c2}介子的共振参数。这些态的质量测量值为m(χ_{c1}) = 3510.71±0.04(统计)±0.09(系统) MeV以及m(χ_{c2}) = 3556.10±0.06(统计)±0.11(系统) MeV，其中带电粒子动量标度的知识主导了系统不确定性。在质量差m(χ_{c2}) - m(χ_{c1}) = 45.39±0.07(统计)±0.03(系统) MeV中，动量标度的不确定性基本抵消。χ_{c2}介子的自然宽度测量值为Γ(χ_{c2}) = 2.10±0.20(统计)±0.02(系统) MeV。这些结果与当前世界平均值吻合良好且精度相当。
