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. 2009 Oct 9;103(15):152001.
doi: 10.1103/PhysRevLett.103.152001. Epub 2009 Oct 5.

Precision measurement of the X(3872) mass in J/psi pi(+) pi(-) decays

T Aaltonen  1 J AdelmanT AkimotoB Alvarez GonzálezS AmerioD AmideiA AnastassovA AnnoviJ AntosG ApollinariA ApresyanT ArisawaA ArtikovW AshmanskasA AttalA AurisanoF AzfarW BadgettA Barbaro-GaltieriV E BarnesB A BarnettP BarriaP BartosV BartschG BauerP-H BeaucheminF BedeschiD BeecherS BehariG BellettiniJ BellingerD BenjaminA BeretvasJ BeringerA BhattiM BinkleyD BiselloI BizjakR E BlairC BlockerB BlumenfeldA BocciA BodekV BoisvertG BollaD BortolettoJ BoudreauA BoveiaB BrauA BridgemanL BrigliadoriC BrombergE BrubakerJ BudagovH S BuddS BuddS BurkeK BurkettG BusettoP BusseyA BuzatuK L ByrumS CabreraC CalanchaM CampanelliM CampbellF CanelliA CanepaB CarlsD CarlsmithR CarosiS CarrilloS CarronB CasalM CasarsaA CastroP CatastiniD CauzV CavaliereM Cavalli-SforzaA CerriL CerritoS H ChangY C ChenM ChertokG ChiarelliG ChlachidzeF ChlebanaK ChoD ChokheliJ P ChouG ChoudalakisS H ChuangK ChungW H ChungY S ChungT ChwalekC I CiobanuM A CiocciA ClarkD ClarkG CompostellaM E ConveryJ ConwayM CordelliG 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VallecorsaN van RemortelA VarganovE VatagaF VázquezG VelevC VellidisM VidalR VidalI VilaR VilarT VineM VogelI VolobouevG VolpiP WagnerR G WagnerR L WagnerW WagnerJ Wagner-KuhrT WakisakaR WallnyS M WangA WarburtonD WatersM WeinbergerJ WeineltW C Wester 3rdB WhitehouseD WhitesonA B WicklundE WicklundS WilburG WilliamsH H WilliamsP WilsonB L WinerP WittichS WolbersC WolfeT WrightX WuF WürthweinS XieA YagilK YamamotoJ YamaokaU K YangY C YangW M YaoG P YehK YiJ YohK YoritaT YoshidaG B YuI YuS S YuJ C YunL ZanelloA ZanettiX ZhangY ZhengS ZucchelliCDF Collaboration
Affiliations

Precision measurement of the X(3872) mass in J/psi pi(+) pi(-) decays

T Aaltonen et al. Phys Rev Lett. .

Abstract

We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi(+)pi(-) using 2.4 fb(-1) of integrated luminosity from pp collisions at square root(s)=1.96 TeV, collected with the CDF II detector at the Fermilab Tevatron. The possible existence of two nearby mass states is investigated. Within the limits of our experimental resolution the data are consistent with a single state, and having no evidence for two states we set upper limits on the mass difference between two hypothetical states for different assumed ratios of contributions to the observed peak. For equal contributions, the 95% confidence level upper limit on the mass difference is 3.6 MeV/c(2). Under the single-state model the X(3872) mass is measured to be 3871.61+/-0.16(stat)+/-0.19(syst) MeV/c(2), which is the most precise determination to date.

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