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. 2004 Oct 15;93(16):162002.
doi: 10.1103/PhysRevLett.93.162002. Epub 2004 Oct 14.

Observation and properties of the X(3872) decaying to J/psipi(+)pi(-) in pp collisions at sqrt[s]=1.96 TeV

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WattsM WayneM WeberH WeertsM WegnerA WhiteV WhiteD WhitesonD WickeD A WijngaardenG W WilsonS J WimpennyJ WittlinT WlodekM WobischJ WomersleyD R WoodZ WuT R WyattQ XuN XuanR YamadaT YasudaY A YatsunenkoY YenK YipS W YounJ YuA YurkewiczA ZabiA ZatserklyaniyM ZdrazilC ZeitnitzB ZhangD ZhangX ZhangT ZhaoZ ZhaoH ZhengB ZhouZ ZhouJ ZhuM ZielinskiD ZieminskaA ZieminskiR ZitounV ZutshiE G ZverevA ZylberstejnD0 Collaboration
Affiliations

Observation and properties of the X(3872) decaying to J/psipi(+)pi(-) in pp collisions at sqrt[s]=1.96 TeV

V M Abazov et al. Phys Rev Lett. .

Abstract

We report the observation of the X(3872) in the J/psipi(+)pi(-) channel, with J/psi decaying to mu(+)mu(-), in pp collisions at sqrt[s]=1.96 TeV. Using approximately 230 pb(-1) of data collected with the Run II D0 detector, we observe 522+/-100 X(3872) candidates. The mass difference between the X(3872) state and the J/psi is measured to be 774.9+/-3.1(stat)+/-3.0(syst) MeV/c(2). We have investigated the production and decay characteristics of the X(3872) and find them to be similar to those of the psi(2S) state.

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