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Brodsky, Stanley J.; Lepage, G. Peter; Tuan, S. F.

doi:10.1103/physrevlett.59.621

Cited by 94 publications

(60 citation statements)

References 7 publications

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“…The first explanation for the MARKII observation, as proposed by Hou and Soni [25] and generalized later by Brodsky et al [26], is the postulate that the decay J/ψ, which violates the helicity selection rule of PQCD, is enhanced by the mixing of the J/ψ with a vector glueball O that decays preferentially to ρπ and other VP channels. The vector glueball O is required to be fairly narrow and nearly degenerate with the J/ψ.…”

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confidence: 99%

“…Since hadronic VT decays, unlike the VP decays, conserve HHC, some other mechanism must be responsible for this suppression in the model. Furthermore, it has been argued that the O may also explain why J/ψ decays to φf 0 (named previously S * ) but not to ρδ, since the O mixes with the φ and enhances a mode that would be otherwise suppressed [26]. However, the observation of non-suppressed ψ(2S) → φf 0 [3], which implies the absence of anomalous enhancement in J/ψ → φf 0 , would rule out such an explanation.…”

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confidence: 99%

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Ratio of hadronic decay rates ofJ/ψandψ(2S)and theρπpuzzle

顾以藩

GGu

2001

Phys. Rev. D

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The so-called ρπ puzzle of J/ψ and ψ(2S) decays is examined using the experimental data available to date. Two different approaches were taken to estimate the ratio of J/ψ and ψ(2S) hadronic decay rates. While one of the estimates could not yield the exact ratio of ψ(2S) to J/ψ inclusive hadronic decay rates, the other, based on a computation of the inclusive ggg decay rate for ψ(2S) (J/ψ) by subtracting other decay rates from the total decay rate, differs by two standard deviations from the naive prediction of perturbative QCD, even though its central value is nearly twice as large as what was naively expected. A comparison between this ratio, upon making corrections for specific exclusive two-body decay modes, and the corresponding experimental data confirms the puzzles in J/ψ and ψ(2S) decays. We find from our analysis that the exclusively reconstructed hadronic decays of the ψ(2S) account for only a small fraction of its total decays, and a ratio exceeding the above estimate should be expected to occur for a considerable number of the remaining decay channels. We also show that the recent new results from the BES experiment provide crucial tests of various theoretical models proposed to explain the puzzle.PACS numbers: 13.25. Gv, 12.38.Qk One of the outstanding problems in heavy quarkonium physics is the strong suppression of the ψ(2S) decays to vector plus pseudoscalar-meson (VP) final states, ρπ and K + K * − + c.c., which is referred to as the ρπ puzzle [1]. Following the first observation of this anomaly [2], meagre experimental progress was made over the years, and theoretical analysis based on limited data often lead to unsatisfactory, sometimes premature, inferences. The situation has been changed dramatically in the last few years. A wealth of interesting new information, which extended the puzzle considerably, has emerged from intense studies of ψ(2S) hadronic decays at the BES experiment, using a large sample of 3.79 million ψ(2S) decays [3]. It is hoped for that new concerted efforts on both the theoretical and experimental side would eventually lead to a solution of this long-standing conundrum.In this paper we seek to examine the ρπ puzzle based purely on existing experimental data. We begin with an analysis for estimating the ratio of hadronic decay rates of J/ψ and ψ(2S), which we shall denote by Q, by using the data compiled by the Particle Data Group [4], in an attempt to avoid as many theoretical ambiguities as possible in the analysis. Two different approaches to this estimate are performed. First we compare the results between themselves, and then the naive prediction of perturbative QCD (PQCD) is used. Subsequently, possible corrections to Q are discussed, as they associate with specific exclusive decay modes, and the corrected values of Q are used as standards to compare with the corresponding experimental data. Comments on the issue of J/ψ and ψ(2S) decays to multi-hadron final states and on the potential similarity of the η c -η c (2S) decays to the ρπ puzzle are profusely added. F...

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confidence: 99%

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confidence: 99%

Ratio of hadronic decay rates ofJ/ψandψ(2S)and theρπpuzzle

顾以藩

GGu

2001

Phys. Rev. D

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“…Hou and Soni [4] suggested that J/ψ → ρπ is enhanced by a mixing of the J/ψ with a glueball O that decays to ρπ. Brodsky, Lepage, and Tuan [5] emphasized that J/ψ → ρπ violates the helicity selection rule of perturbative QCD, and argued that the data requires O to be narrow and nearly degenerate with the J/ψ. Present data from BES constrains the mass and width of the glueball to the ranges |m O − m J/ψ | < 80 MeV and 4 MeV < Γ O < 50 MeV [6].…”

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confidence: 99%

An Explanation for theρ−πPuzzle ofJ/ψand
Chen
¹
,
Braaten
²

1998
Phys. Rev. Lett.
61
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32
0
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We propose a new explanation for the longstanding puzzle of the tiny branching fraction of ψ ′ → ρπ relative to that for J/ψ → ρπ. In the case of J/ψ, we argue that this decay is dominated by a higher Fock state in which the cc pair is in a color-octet 3 S 1 state and via annihilate process cc → qq. In the case of the ψ ′ , we argue that the probability for the cc pair in this higher Fock state to be close enough to annihilate is suppressed by a dynamical effect related to the small energy gap between the mass of the ψ ′ and the DD threshold.

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“…The ψ(2S) → resonance → hadrons is a twist of an old one: A noncharm resonance may exist near the ψ(2S) mass and give an extra contribution to the hadronic decay rate. A glueball was proposed earlier at the J/ψ mass to boost the ρπ decay of J/ψ [17]. However we now want it near ψ(2S), not near J/ψ.…”

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confidence: 99%

“…We look into the possibility that R around the ψ(2S) mass destructively interferes with the perturbative ψ(2S) → ggg → 1 − 0 − decay. Note unlike the glueball proposed near J/ψ mass to enhance J/ψ → ρπ [17] and hence the unnatural property that it decays predominantly into 1 − 0 − , in our case, since glueball R is introduced to account for the hadronic excess, it should couple not primarily to the 1 − 0 − channels, but to many other channels and hence is quite natural. If R has total width Γ R is as narrow as 100 MeV, for instance, the mixing |ǫ| = O(10 −2 ) would be able to account for the excess in the inclusive hadron decay of ψ(2S).…”

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confidence: 99%

Aspects of Charmonium Physics

Tuan¹

2002

AIP Conference Proceedings

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Abstract. I review possible resolution of the J/ψ(ψ ′ ) → ρ − π puzzle based on two inputs: the relative phase between the one-photon and the gluonic decay amplitudes, and a possible hadronic excess in the inclusive nonelectromagnetic decay rate of ψ ′ . The status of a universal large phase here is examined for its meaning and implications (including those for B-physics). Since the future of tau/charm facility(s) are again under consideration together with a future anti-proton facility at GSI, I propose to extend my review to include a broader discussion of charmonium physics. Outstanding questions like the status of the 1 P 1 state of charmonium, measuring D 0 −D 0 mixing and relative strong phases, status of molecular P(S) -wave charmonia will also be discussed amongst others.

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Exclusive charmonium decays: The J/ψ (ψ’)→ρπ,K/emph>K¯puzzle

Cited by 94 publications

References 7 publications

Ratio of hadronic decay rates ofJ/ψandψ(2S)and theρπpuzzle

Ratio of hadronic decay rates ofJ/ψandψ(2S)and theρπpuzzle

An Explanation for theρ−πPuzzle ofJ/ψand
Chen
¹
,
Braaten
²

1998
Phys. Rev. Lett.
61
0
32
0
View full text Add to dashboard Cite

Aspects of Charmonium Physics

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Exclusive charmonium decays: The J/ψ (ψ’)→ρπ,K/emph>K¯puzzle

Cited by 94 publications

References 7 publications

Ratio of hadronic decay rates ofJ/ψandψ(2S)and theρπpuzzle

Ratio of hadronic decay rates ofJ/ψandψ(2S)and theρπpuzzle

An Explanation for theρ−πPuzzle ofJ/ψandChen1, Braaten2 1998Phys. Rev. Lett.610320View full textAdd to dashboardCite

Aspects of Charmonium Physics

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About

An Explanation for theρ−πPuzzle ofJ/ψand
Chen
¹
,
Braaten
²

1998
Phys. Rev. Lett.
61
0
32
0
View full text Add to dashboard Cite