Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>γ</mml:mi><mml:msub><mml:mrow><mml:mi>η</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">c</mml:mi></mml:mrow></mml:msub></mml:math> decay rate and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>η</mml:mi></m

Anashin, V.V.; Aulchenko, V.; Baldin, E. M.; Barladyan, A.K.; Barnyakov, A.; Barnyakov, M.Yu.; Baru, S.E.; Basok, I.Yu.; Bedny, I.; Blinov, A. E.; Blinov, V.; Bobrov, A.; Bogomyagkov, A.; Bondar, A.; Бузыкаев, А. Р.; Eidelman, S.; Glukhovchenko, Yu.M.; Gulevich, V.V.; Gusev, D.V.; Karnaev, S. E.; Karpov, G. V.; Karpov, S. V.; Kharlamova, T.; Киселев, В. А.; Kononov, S.A.; Kotov, K.; Kravchenko, E. A.; Kulikov, V.; Kurkin, G.Ya.; Купер, Э. А.; Levichev, E.; Maksimov, D.A.; Малышев, В. М.; Maslennikov, A. L.; Medvedko, A. S.; Meshkov, O.; Mishnev, S. I.; Морозов, И. И.; Muchnoi, N. Yu.; Neufeld, V. V.; Никитин, С.А.; Nikolaev, I. B.; Okunev, I.N.; Onuchin, A. P.; Oreshkin, S.B.; Орлов, И.; Осипов, А. А.; Peleganchuk, S. V.; Pivovarov, S.G.; Piminov, P.; Petrov, Vladimir; Poluektov, A.; Pospelov, G. E.; Prisekin, V.G.; Rezanova, O. L.; Рубан, А.А.; Sandyrev, V. K.; Savinov, G.A.; Shamov, A.G.; Shatilov, D.; Shwartz, B.; Симонов, Е. А.; Sinyatkin, S. V.; Skrinsky, A.N.; Smaluk, Victor; Sokolov, A.; Soukharev, A. M.; Starostina, E.V.; Talyshev, A.; Tayursky, V.A.; Telnov, V. I.; Tikhonov, Yu. A.; Todyshev, K. Yu; Tumaikin, G.M.; Usov, Y.; Воробйов, А.І.; Yushkov, A. N.; Zhilich, V.; Zhulanov, V.; Журавлев, А. Н.

doi:10.1016/j.physletb.2014.09.064

Cited by 18 publications

(12 citation statements)

References 26 publications

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“…Our finding was soon corroborated by a completely independent simulations made by the HPQCD Collaboration, in which the effects of N f = 2 + 1 staggered light quark flavors were included [11]. Both lattice results implemented the non-perturbative renormalization procedure and, in the continuum limit, exhibited quite a remarkable agreement for Γ(J/ψ → η c γ), also in agreement with the most recent experimental findings [9]. Furthermore, recent improvement of the effective theory approach, based on potential…”

Section: Introductionsupporting

confidence: 85%

“…Only in 2009 the CLEO Collaboration [8] was able to provide a new measurement of this decay width and found it to be over 1σ larger than the one measured using the Crystal Ball detector in 1986 [1], but still somewhat smaller than predicted. A very recent measurement at the KEDR experiment confirmed the CLEO result in that Γ(J/ψ → η c γ) is large [9], and reported a value 1.4σ larger than that by CLEO. The charm factory at BESIII is expected to provide a new experimental determination of this decay width and close this issue.…”

Section: Introductionmentioning

confidence: 67%

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Lattice QCD estimate of the η c (2S) → J/ψγ decay rate

Bečirević

Kruse

Sanfilippo

2015

J. High Energ. Phys.

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We compute the hadronic matrix element relevant to the physical radiative decay η c (2S) → J/ψγ by means of lattice QCD. We use the (maximally) twisted mass QCD action with N f = 2 light dynamical quarks and from the computations made at four lattice spacings we were able to take the continuum limit. The value of the mass ratio m ηc(2S) /m ηc(1S) we obtain is consistent with the experimental value, and our prediction for the form factor is V ηc(2S)→J/ψγ (0) ≡ V 12 (0) = 0.32(6)(2), leading to Γ(η c (2S) → J/ψγ) = (15.7 ± 5.7) keV, which is much larger than Γ(ψ(2S) → η c γ) and within reach of modern experiments.

show abstract

Section: Introductionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 67%

Lattice QCD estimate of the η c (2S) → J/ψγ decay rate

Bečirević

Kruse

Sanfilippo

2015

J. High Energ. Phys.

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“…There are three different determinations from LHCb [34,35,37], two of which also measured the hyperfine splitting. We include a KEDR measurement [33], two from different BABAR analyses [38] and two from BESIII [39,40].…”

Section: Fig 8 Comparison Of Different Experimental Results For Thementioning

confidence: 99%

“…There are only three experimental results used in these analyses that can independently produce values for the hyperfine splitting. These are the KEDR experiment [32,33] and two LHCb analyses in different channels [34,35]. The LHCb result in [35] used the η c ð2SÞ → pp decay while the analysis of [34] used η c ð1SÞ → pp.…”

Section: Discussion: Hyperfine Splittingmentioning

confidence: 99%

Charmonium properties from lattice QCD+QED : Hyperfine splitting, J/ψ leptonic width, charm quark mass, and
Hatton
¹
,
Davies
²
,
Galloway
³

et al. 2020
Phys. Rev. D
59
6
68
0
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We have performed the first n f ¼ 2 þ 1 þ 1 lattice QCD computations of the properties (masses and decay constants) of ground-state charmonium mesons. Our calculation uses the Highly Improved Staggered Quark (HISQ) action to generate quark-line connected two-point correlation functions on MILC gluon field configurations that include u=d quark masses going down to the physical point, tuning the c-quark mass from M J=ψ and including the effect of the c quark's electric charge through quenched QED. We obtain M J=ψ − M η c ðconnectedÞ ¼ 120.3ð1.1Þ MeV and interpret the difference with experiment as the impact on M η c of the η c decay to gluons, missing from the lattice calculation. This allows us to determine ΔM annihiln η c ¼ þ7.3ð1.2Þ MeV, giving its value for the first time. Our result of f J=ψ ¼ 0.4104ð17Þ GeV gives ΓðJ=ψ → e þ e − Þ ¼ 5.637ð49Þ keV, in agreement with, but now more accurate than, experiment. At the same time we have improved the determination of the c-quark mass, including the impact of quenched QED to givem c ð3 GeVÞ ¼ 0.9841ð51Þ GeV. We have also used the time moments of the vector charmonium current-current correlators to improve the lattice QCD result for the c quark hadronic vacuum polarization (HVP) contribution to the anomalous magnetic moment of the muon. We obtain a c μ ¼ 14.638ð47Þ × 10 −10 , which is 2.5σ higher than the value derived using moments extracted from some sets of experimental data on Rðe þ e − → hadronsÞ. This value for a c μ includes our determination of the effect of QED on this quantity, δa c μ ¼ 0.0313ð28Þ × 10 −10 .

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“…−0.33 keV at KEDR [79]. As a whole, strong model dependence exists in the predictions of the M1 transitions, more studies are needed in both theory and experiments.…”

Section: Lighter Statesmentioning

confidence: 99%

Charmonium spectrum and electromagnetic transitions with higher multipole contributions

et al. 2017

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The charmonium spectrum is calculated with two nonrelativistic quark models, the linear potential model and the screened potential model. Using the obtained wavefunctions, we evaluate the electromagnetic transitions of charmonium states up to 4S multiplet. The higher multipole contributions are included by a multipole expansion of the electromagnetic interactions. Our results are in reasonable agreement with the measurements. As conventional charmonium states, the radiative decay properties of the newly observed charmonium-like states, such as X(3823), X(3872), X(4140/4274), are discussed. The X(3823) as ψ 2 (1D), its radiative decay properties well agree with the observations. From the radiative decay properties of X(3872), one can not exclude it as a χ c1 (2P) dominant state. We also give discussions of possibly observing the missing charmonium states in radiative transitions, which might provide some useful references to look for them in forthcoming experiments. The higher multipole contributions to the electromagnetic transitions are analyzed as well. It is found that the higher contribution from the magnetic part could give notable corrections to some E1 dominant processes by interfering with the E1 amplitudes. Our predictions for the normalized magnetic quadrupole amplitudes M 2 of the χ c1,2 (1P) → J/ψγ processes are in good agreement with the recent CLEO measurements.

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Measurement of J/ψ→γηc decay rate and η

Cited by 18 publications

References 26 publications

Lattice QCD estimate of the η c (2S) → J/ψγ decay rate

Lattice QCD estimate of the η c (2S) → J/ψγ decay rate

Charmonium properties from lattice QCD+QED : Hyperfine splitting, J/ψ leptonic width, charm quark mass, and
Hatton
¹
,
Davies
²
,
Galloway
³

et al. 2020
Phys. Rev. D
59
6
68
0
View full text Add to dashboard Cite

Charmonium spectrum and electromagnetic transitions with higher multipole contributions

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Measurement of J/ψ→γηc decay rate and η

Cited by 18 publications

References 26 publications

Lattice QCD estimate of the η c (2S) → J/ψγ decay rate

Lattice QCD estimate of the η c (2S) → J/ψγ decay rate

Charmonium properties from lattice QCD+QED : Hyperfine splitting, J/ψ leptonic width, charm quark mass, and Hatton1, Davies2, Galloway3 et al. 2020Phys. Rev. D596680View full textAdd to dashboardCite

Charmonium spectrum and electromagnetic transitions with higher multipole contributions

Contact Info

Product

Resources

About

Charmonium properties from lattice QCD+QED : Hyperfine splitting, J/ψ leptonic width, charm quark mass, and
Hatton
¹
,
Davies
²
,
Galloway
³

et al. 2020
Phys. Rev. D
59
6
68
0
View full text Add to dashboard Cite