1,725,322 research outputs found
Evidence for the decay X(3872)→ψ(2S)γ
No full textEvidence for the decay mode X(3872)→ψ(2S)γ in B+→X(3872)K+ decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton–proton collisions, corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector, at centre-of-mass energies of 7 and 8 TeV. The ratio of the branching fraction of the X(3872)→ψ(2S)γ decay to that of the X(3872)→J/ψγ decay is measured to be
where the first uncertainty is statistical and the second is systematic. The measured value does not support a pure molecular interpretation of the X(3872) state
Measurements of the branching fractions of B+→ppK+ decays
No full textThe branching fractions of the decay B+ → pp̄K+ for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb experiment. The total branching fraction, its charmless component Mpp̄ < 2.85 GeV/c2 and the branching fractions via the resonant cc̄ states η c(1S) and ψ(2S) relative to the decay via a J/ψ intermediate state are [Equation not available: see fulltext.] Upper limits on the B + branching fractions into the η c(2S) meson and into the charmonium-like states X(3872) and X(3915) are also obtained
Study of +−→(3872) and (3872) from 4.66 to 4.95 GeV
No full textUsing data samples with an integrated luminosity of 4.5 fb-1 collected by the BESIII detector at center-of-mass energies ranging from 4.66 GeV to 4.95 GeV, we study the processes of e+e-→ωX(3872) and e+e-→γX(3872). With the e+e-→ωX(3872) process, the branching fraction ratio RB(X(3872)→γJ/ψ)B(X(3872)→π+π-J/ψ) is measured to be 0.38±0.20stat±0.01syst (R<0.83 at 90% confidence level). In addition, we measure the ratio of the average cross section of e+e-→ωX(3872) to e+e-→ωχc1(ωχc2) to be σωX(3872)/σωχc1(σωX(3872)/σωχc2)=5.2±1.0stat±1.9syst(5.5±1.1stat±2.4syst). Finally, we search for the process of e+e-→γX(3872), and no obvious signal is observed. The upper limit on the ratio of the average cross section of e+e-→γX(3872) to e+e-→ωX(3872) is set as σγX(3872)/σωX(3872)<0.23 at 90% confidence level
Observation of X(3872) in B X(3872)Kpi decays
No full textWe report the first observation of and evidence for . We measure the product of branching fractions for the former to be and find that does not dominate the decay mode. We also measure . This study is based on the full data sample of 711 ( pairs) collected at the resonance with the Belle detector at the KEKB collider
Search for X (3872) →π0π0χc1,2
No full textUsing 10.1 fb-1 of e+e- collision data collected by the BESIII detector with center-of-mass energies between 4.15 GeV and 4.30 GeV, we search for the decays X(3872)→π0π0χc1,2, where the X(3872) is produced in e+e-→γX(3872). No evidence above 3σ is found for either decay. Upper limits at the 90% CL on the branching fractions of X(3872)→π0π0χc1,2 normalized to the branching fraction of X(3872)→π+π-J/ψ are set to be B(X(3872)→π0π0χc1)/B(X(3872)→π+π-J/ψ)<1.1 and B(X(3872)→π0π0χc2)/B(X(3872)→π+π-J/ψ)<0.5, taking into account both statistical and systematic uncertainties
Observation of X(3872) in B→X(3872)Kπ decays
No full textWe report the first observation of B0 → X(3872) K+pi- and evidence for B+ -> X(3872)(K0pi+). We measure the product of branching fractions
Search for X (3872) →π0π0χc1,2
No full textUsing 10.1 fb-1 of e+e- collision data collected by the BESIII detector with center-of-mass energies between 4.15 GeV and 4.30 GeV, we search for the decays X(3872)→π0π0χc1,2, where the X(3872) is produced in e+e-→γX(3872). No evidence above 3σ is found for either decay. Upper limits at the 90% CL on the branching fractions of X(3872)→π0π0χc1,2 normalized to the branching fraction of X(3872)→π+π-J/ψ are set to be B(X(3872)→π0π0χc1)/B(X(3872)→π+π-J/ψ)<1.1 and B(X(3872)→π0π0χc2)/B(X(3872)→π+π-J/ψ)<0.5, taking into account both statistical and systematic uncertainties.</p
Search for X (3872) →π0π0χc1,2
No full textUsing 10.1 fb-1 of e+e- collision data collected by the BESIII detector with center-of-mass energies between 4.15 GeV and 4.30 GeV, we search for the decays X(3872)→π0π0χc1,2, where the X(3872) is produced in e+e-→γX(3872). No evidence above 3σ is found for either decay. Upper limits at the 90% CL on the branching fractions of X(3872)→π0π0χc1,2 normalized to the branching fraction of X(3872)→π+π-J/ψ are set to be B(X(3872)→π0π0χc1)/B(X(3872)→π+π-J/ψ)<1.1 and B(X(3872)→π0π0χc2)/B(X(3872)→π+π-J/ψ)<0.5, taking into account both statistical and systematic uncertainties.</p
Search for X (3872) →π0π0χc1,2
No full textUsing 10.1 fb-1 of e+e- collision data collected by the BESIII detector with center-of-mass energies between 4.15 GeV and 4.30 GeV, we search for the decays X(3872)→π0π0χc1,2, where the X(3872) is produced in e+e-→γX(3872). No evidence above 3σ is found for either decay. Upper limits at the 90% CL on the branching fractions of X(3872)→π0π0χc1,2 normalized to the branching fraction of X(3872)→π+π-J/ψ are set to be B(X(3872)→π0π0χc1)/B(X(3872)→π+π-J/ψ)<1.1 and B(X(3872)→π0π0χc2)/B(X(3872)→π+π-J/ψ)<0.5, taking into account both statistical and systematic uncertainties.LPHE-L
Ambiversion of X(3872)
No full textAbstractAn analysis including most recent Belle data on X(3872) is performed, using coupled channel Flatté formula. A third sheet pole close to but below D0D∗0 threshold is found, besides the bound state/virtual state pole discussed in previous literature. The co-existence of two poles near the D0D∗0 threshold indicates that the X(3872) may be of ordinary cc¯ 23P1 state origin, distorted by strong coupled channel effects. The latter manifests itself as a molecular bound state (or a virtual state)
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