Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">η</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>(1<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math

Armstrong, T. A.; Bettoni, D.; Bharadwaj, V.; Biino, C.; Blanford, G.; Borreani, G.; Broemmelsiek, D.; Buzzo, A.; Calabrese, R.; Ceccucci, A.; Cester, R.; Church, M.; Dalpiaz, P. F.; Dimitroyannis, D.; Fabbri, M.; Fast, J. E.; Gianoli, A.; Ginsburg, C. M.; Gollwitzer, K.; Govi, G.; Hahn, A.; Hasan, M. A.; Hsueh, S.; Lewis, R.; Luppi, E.; Macrı́, M.; Majewska, A. M.; Mandelkern, M.; Marchetto, F.; Marinelli, M.; Marques, J.; Marsh, W.; Martini, M.; Masuzawa, M.; Menichetti, E.; Migliori, A.; Mussa, R.; Palestini, S.; Pallavicini, M.; Passaggio, S.; Pastrone, N.; Patrignani, C.; Peoples, J.; Petrucci, F.; Pia, M.G.; Pordes, S.; Rapidis, P. A.; Ray, R.; Reid, John D.; Rinaudo, G.; Roccuzzo, B.; Rosen, J.; Santroni, A.; Sarmiento, M.; Savrré, M.; Schultz, J.; Seth, K. K.; Smith, A.; Smith, G. A.; Sozzi, M.; Trokenheim, S.; Weber, M. F.; Werkema, S.; Zhang, Y.; Zhao, Jing; Zioulas, G.

doi:10.1103/physrevd.52.4839

Cited by 33 publications

(6 citation statements)

References 45 publications

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“…As shown in Table I, our results for the 3 P 0 and 3 P 2 states are in agreement with the Particle Data Group [10], while our results for the two-gluon decay of the 1 S 0 state disagree with the Particle Data Group but agree with the more recent findings of the E760 collaboration [11].…”

Section: Discussionsupporting

confidence: 88%

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Relativistic two-photon and two-gluon decay rates of heavy quarkonia

Gupta

Johnson²,

Repko³

1996

Phys. Rev. D

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The decay rates of $c\bar{c}$ and $b\bar{b}$ through two-photon or two-gluon annihilations are obtained by using totally relativistic decay amplitudes and a sophisticated quantum-chromodynamic potential model for heavy quarkonia. Our results for the photonic and gluonic widths of the 1S0, 3P0, and the 3P2 states are in excellent agreement with the available experimental data. The procedures and mathematical techniques used by us for the treatment of the fermion-antifermion bound states are also applicable to other decay processes.Comment: 15 pages, RevTeX, PostScript available at http://gluon.physics.wayne.edu/wsuhep/jim/predecay.p

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Section: Discussionsupporting

confidence: 88%

“…Our results for cc and bb, together with the available experimental data [10,11], are given in Table I.…”

Section: Quarkonium Photonic and Gluonic Widthsmentioning

confidence: 99%

Relativistic two-photon and two-gluon decay rates of heavy quarkonia

Gupta

Johnson²,

Repko³

1996

Phys. Rev. D

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“…The PDG average there is based on a fit to 7 measurements with poor internal consistency and the confidence level is only 0.001. The measurement of E760 [25] disagrees with the value of DM2 [26] by almost 4σ and is almost 10 MeV different from 1994 PDG average. The change will cause a shift in the value of the hyperfine splitting for the S-wave charmonium states which, in turn, are important in understanding the spin-spin forces.…”

Section: 1 S 0 : η Ccontrasting

confidence: 58%

“…A comparison of recent results is shown in Table 4. Table 4 Recent data on η c mass Experiment Mass of η c (MeV) L3 [18] 2974 ± 18 BES [13] 2975.8 ± 3.9 ± 1.2 E760 [25] 2988.3 +3.3 New measurements on η c width was made by E760 [25], Γ = 23.9 +12.6 −7.1 MeV, and improved by E835 afterwards [20] with Γ = 17.8 +7.2 −6.9 MeV (preliminary). The results are still larger than previous measurements [2] where for instance the Crystal Ball value in 1986 is listed as 11.5 ± 4.5 MeV, and the errors remain large.…”

Section: 1 S 0 : η Cmentioning

confidence: 99%

Charmonium decay physics

Tuan

2000

Nuclear Physics A

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“…The preceding experiment, E760, searched for evidence of an η ′ c in the mass range 3584-3624 MeV without success. For the η c , E760 reported B(η c → γγ) = (2.80 +0.67 −0.58 ± 1.0) × 10 −4 [8]; this is close to a perturbative QCD estimate of B(η c → γγ) = 3.0 × 10 −4 [7], but the signal is seen at a mass of 2988 +3.3 −3.1 MeV, somewhat higher than the PDG value of 2978 ± 1.9 MeV. It is especially interesting that E760 finds a rather large width for the η c , Γ ηc = 23.9 +13.6 −7.1 MeV, compared to the PDG value of 10.3 +3.…”

mentioning

confidence: 99%

Prospects for detecting an η′c in two-photon processes

1996

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We argue that an experimental search for an η ′ c , the first radial excitation of the η c (2980), may be carried out using the two photon process e + e − → e + e − γγ → e + e − η ′ c . We estimate the partial width Γ γγ (η ′ c ) and the branching fraction B(η ′ c → h), where h is an exclusive hadronic channel, and find that for The η ′ c meson is the first radial excitation of the η c (2980), the charmonium ground state with J PC = 0 −+ . The mass and couplings of this state can be used to test potential models and lattice QCD calculations. In this paper we discuss possible experimental signatures and event rates for the η ′ c , and note that it may be observable in future CLEO-II data sets.

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Study of theηc(11

Abstract: Study of the q,(1 ' S o ) state of charmonium formed in pp annihilations and a search for the qL(2 ' S o )T.A. A r m~t r o n g ,~

Cited by 33 publications

References 45 publications

Relativistic two-photon and two-gluon decay rates of heavy quarkonia

Relativistic two-photon and two-gluon decay rates of heavy quarkonia

Charmonium decay physics

Prospects for detecting an η′c in two-photon processes

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