First observation of the decays chicJ-->pi0pi0pi0pi0

Physical Review D, 1999

Hadronic decays of the P-wave spin-triplet charmonium states χ cJ (J = 0, 1, 2) are studied using a sample of ψ(2S) decays collected by the BES detector operating at the BEPC storage ring. Branching fractions for the decays

Physical Review D, 2010

We show that in the transitions c 0 ! h c 0 and 0 c ! c0 0 the contributions from charmed-meson loops are highly suppressed, in contrast to various other charmonium decays. We calculate the width of the c 0 ! h c 0 , which agrees with the recent BES-III data, and predict the width of the 0 c ! c0 0 , Àð 0 c ! c0 0 Þ ¼ 1:5 AE 0:4 keV. A confirmation of this prediction would also provide additional support for a recent analysis of c 0 ! J=c 0 ðÞ, where loops are claimed to play a prominent role.

Physical Review D, 2007

Physical Review Letters, 2003

Physical Review D, 2014

Using data samples of 102 × 10 6 Υ(1S) and 158 × 10 6 Υ(2S) events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays Υ(1S, 2S) → J/ψ(ψ ′) + X, where X = η c , χ cJ (J = 0, 1, 2), η c (2S), X(3940), and X(4160). No significant signal is observed in the spectra of the mass recoiling against the reconstructed J/ψ or ψ ′ except for the evidence of χ c1 production with a significance of 4.6σ for Υ(1S) → J/ψ + χ c1. The measured branching fraction B(Υ(1S) → J/ψ + χ c1) is (3.90 ± 1.21(stat.) ± 0.23(syst.)) × 10 −6. The 90% confidence level upper limits on the branching fractions of the other modes having a significance of less than 3σ are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach.

Physical Review D, 2012

Using (106 ± 4) × 10 6 ψ ′ events accumulated with the BESIII detector at the BEPCII e + e − collider, we present measurements of the branching fractions for ψ ′ decays to K + K − π 0 and K + K − η. In these final states, the decay ψ ′ → K * 2 (1430) + K − + c.c. is observed for the first time, and its branching fraction is measured to be (7.12 ± 0.62 (stat.) +1.13 −0.61 (syst.)) × 10 −5 , which indicates a violation of the helicity selection rule in ψ ′ decays. The branching fractions of ψ ′ → K * (892) + K − + c.c., φη, φπ 0 are also measured. The measurements are used to test the QCD predictions on charmonium decays.

1992

The description of two-body charmonium decays in QCD cannot be entirely based on lowest order perturbation theory; the modest Q 2 values involved make higher order and non perturbative corrections still sizeable and, in some cases, indeed leading. The separate experimental evaluation of such corrections, according to the available data, is difficult. Two different spin measurements are suggested in pp → χ c2 and χ c2 → ρρ processes, which are sensitive to the presence of two quark correlations inside protons and to constituent mass corrections respectively.

The European Physical Journal C, 2017

Using decays to φ-meson pairs, the inclusive production of charmonium states in b-hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0 fb -1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X (3872), X (3915) and χ c2 (2P) states are obtained as R X (3872) χ c1 < 0.34, R X (3915) χ c0 < 0.12 and R χ c2 (2P) χ c2 < 0.16. Differential cross-sections as a function of transverse momentum are measured for the η c (1S) and χ c states. The branching fraction of the decay B 0 s → φφφ is measured for the first time, B(B 0 s → φφφ) = (2.15 ± 0.54 ± 0.28±0.21 B )×10 -6 . Here the third uncertainty is due to the branching fraction of the decay B 0 s → φφ, which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse φ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the η c (1S) decays to φφ and p p as B(η c (1S) → φφ)/B(η c (1S) → p p) = 1.79 ± 0.14 ± 0.32.

2022

The Ξ++ cc → Ξ ′+ c π + decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The Ξ++ cc → Ξ ′+ c π + decay is reconstructed partially, where the photon from the Ξ ′+ c → Ξ+ c γ decay is not reconstructed and the pK−π+ final state of the Ξ+ c baryon is employed. The Ξ ++ cc → Ξ ′+ c π + branching fraction relative to that of the Ξ++ cc → Ξ+ c π+ decay is measured to be 1.41±0.17±0.10, where the first uncertainty is statistical and the second systematic.

Physical Review D, 2009