2004
DOI: 10.1103/physrevlett.93.072001
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Observation of the Narrow StateX(3872)J/ψπ+πinp¯

Abstract: We report the observation of a narrow state decaying into J/psipi+pi- and produced in 220 pb(-1) of p p-bar collisions at =1.96 Tesqaure root of sV in the CDF II experiment. We observe 730+/-90 decays. The mass is measured to be 3871.3+/-0.7(stat)+/-0.4(syst) MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.

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Cited by 592 publications
(194 citation statements)
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“…confirmed later in some other experiments [2][3][4]. The exotic states were produced and observed in B meson decays, in the e + e − and pp annihilations, in the double charmonium production processes, in the two-photon fusion and pp collisions.…”
Section: Introductionsupporting
confidence: 58%
See 1 more Smart Citation
“…confirmed later in some other experiments [2][3][4]. The exotic states were produced and observed in B meson decays, in the e + e − and pp annihilations, in the double charmonium production processes, in the two-photon fusion and pp collisions.…”
Section: Introductionsupporting
confidence: 58%
“…Later the X(3872) was observed also through direct production mode in pp annihilation [2,3], as well as in the e + e − annihilation and pp collisions [13]. The assigned quantum numbers to X state are 1 ++ , its average mass extracted from different experiments is m X = (3871.69 ± 0.17) MeV , and the decay width was estimated as Γ < 1.2 MeV [10,19,20].…”
Section: Introductionmentioning
confidence: 99%
“…The efficiency is calculated for the 2011a dataset in each bin since the changes in efficiency related to the trigger evolution during data taking do not affect the efficiency ratio. The average value of A · in each p T bin is determined using fine-grained bins in transverse momentum as 3) where N i is the number of signal events observed in the data,…”
Section: Jhep04(2013)154mentioning
confidence: 99%
“…The discovery of the X(3872) resonance by the Belle experiment in 2003 [1] and its subsequent confirmation by BaBar, CDF, and D0 [2][3][4] has attracted a large interest in "exotic" quarkonium spectroscopy since it was the first observation of an unexpected charmonium candidate. Many new unconventional states with masses above the open-charm or open-bottom thresholds, m > m(DD) and m > m(BB), respectively, have been observed [5].…”
Section: Introductionmentioning
confidence: 99%
“…Decays of B mesons provide a fruitful opportunity to study these states and to find new ones. For example, the state X(3872) was first observed by Belle in exclusive B + → K + π + π − J/ψ decays [1] that was later confirmed by CDF [2], DØ [3] and BaBar [4]. It was also observed in the LHCb experiment [5,6] in pp collisions and B decays.…”
Section: Introductionmentioning
confidence: 67%