Revisit the radiative decays of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>ψ</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>γ</mml:mi><mml:msub><mml:mi>η</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mi>γ</mml:mi><mml:msubsup><mml:mi>η</mml:mi><mml:mi>c</mml:mi><mml:mo>′</m

Li, Gang; Zhao, Qiang

doi:10.1103/physrevd.84.074005

Cited by 26 publications

(3 citation statements)

References 43 publications

(91 reference statements)

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“…The lattice QCD calculation [65] obtained ψ ′ → γη c = 0.4 ± 0.8 keV, while its uncertainty was apparently large. Recently, Li and Zhao has interpreted this discrepancy of potential model via taking the intermediate meson loop (IML) into account [66]. The IML contributions bring down the GI amplitude to 2.05 +2.650 −1.75 keV, where the cut-off parameter played a crucial and sensitive role.…”

Section: M1 Transition Of J/ψ and ψ ′mentioning

confidence: 99%

Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

2012

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We study the mass spectrum and electromagnetic processes of charmonium system with the spin-dependent potentials fully taking into account in the solution of the Schroedinger equation and the results for the pure scalar and scalar-vector mixing linear confining potentials are compared. It is revealed that the scalar-vector mixing confinement is important for reproducing the mass spectrum and decay widths and the vector component is found to be around 22%, the long-standing discrepancy in M1 radiative transitions of J/ψ and ψ ′ is alleviated by means of the state wave functions obtained via the Hamiltonian with the full spin-dependent potential. This work also intends to identify few of the copious higher charmonium-like states as the cc ones. Particularly, the newly observed X(4160) and X(4350) are assigned as M (2 1 D 2 ) = 4164.9 MeV and M (3 3 P 2 ) = 4352.4 MeV, which strongly favor the J P C = 2 −+ , 2 ++ assignments respectively. The corresponding radiative transitions, leptonic and two-photon decay widths have been also calculated for the further experimental study.Keywords charmonium · potential model · Gaussian expansion method · XYZ mesons 1 IntroductionDue to the impressive increase of experimental results, charmonium (cc) spectroscopy has renewed great interest recently, coming along with the striking disagreement with theoretical expectations [1,2,3]. The unexpected and still-fascinating X(3872) has been joined by more than a dozen other charmonium-like states, while the series of vacancy have been left on the cc list. It is urgent to identify the possible new members of charmonium family from the abundant observations. The QCD inspired potential models have been playing an important role in investigating heavy quarkonium, owning to the presence of large nonperturbative effects in this energy region. Most quark potential models [4,5,6,7,8,9,10,11,12,13,14,15,16] have common ingredients under the nonrelativistic limit, despite some differences in the detailed corrections for relativistic and coupled channel effects, which typically are the Coulomb-like term induced by one-gluon exchange plus the long-range confining potential expected from nonperturbative QCD. Anyway, the nature of confining mechanism has been veiled so far. In the original Cornell model [17,18], it was assumed as Lorentz scalar, which gives a vanishing long-range magnetic contribution and agrees with the flux tube picture of quark

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Section: M1 Transition Of J/ψ and ψ ′mentioning

confidence: 99%

Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

2012

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“…c ð2SÞÞ ¼ ð0:1-6:2Þ Â 10 À4 [10]. A recent calculation [11] that includes contributions from loops containing meson pairs finds a strong cancellation that results in a partial width of ð0:08 AE 0:03Þ keV and a branching fraction of ð2:6 AE 1:0Þ Â 10 À4 , while a calculation using the light-front quark model and a 2S state harmonic oscillator wave function to present the 2S charmonium state gives a transition rate of 3:9 Â 10 À4 [12]. Experimentally, this transition has been searched for by Crystal Ball [13], BES [14], CLEO [15] and most recently by BESIII through c ð2SÞ !…”

mentioning

confidence: 99%

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
34
1
8
0
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Using a sample of 106 Â 10 6 c ð3686Þ events collected with the BESIII detector at the BEPCII storage ring, we have made the first measurement of the M1 transition between the radially excited charmonium S-wave spin-triplet and the radially excited S-wave spin-singlet states: c ð3686Þ ! c ð2SÞ. Analyses of the processes c ð3686Þ ! c ð2SÞ with c ð2SÞ ! K The quarkonium states play an important role in understanding the strong interaction between quarks. The charmonium states below the open-charm production threshold are relatively well understood, with the notable exception of the spin singlets [1], which include the P-wave state h c and the S-wave ground state c and its first radial excitation c ð2SÞ [2]. These are experimentally challenging because of the low production rates and spin-parity quantum numbers that are inaccessible in direct e þ e À annihilations. The c ð2SÞ was first observed by the Belle collaboration in the processIt was confirmed in the two-photon production of 6,7]. In this Letter, we report the first observation of c ð3686Þ ! c ð2SÞ,,5], and in the double-charmonium production process e þ e À ! J=c c " c [The data sample for this analysis consists of an integrated luminosity of 156 pb À1 (106 Â 10 6 events) produced at the peak of the c ð3686Þ resonance [17] and collected in the BESIII detector [18]. An additional 42 pb À1 of data were collected at a center-of-mass energy of ffiffi ffi s p ¼ 3:65 GeV to determine nonresonant continuum background contributions.The BESIII detector, described in detail in Ref. [18], has an effective geometrical acceptance of 93% of 4. A small-cell, helium-based main drift chamber in a 1-T magnetic field provides a charged-particle momentum resolution of 0.5% at 1 GeV=c, and specific-ionization (dE=dx) measurements for particle identification with a resolution better than 6% for electrons from Bhabha scattering. The cesium iodide electromagnetic calorimeter (EMC) measures photon energies with resolutions at 1.0 GeV of 2.5% and 5% in the detector's barrel (j cosj < 0:8, where is the polar angle with respect to the e þ direction) and end caps (0:86 < j cosj < 0:92), respectively. Additional particle identification is provided by a time-of-flight system with a time resolution of 80 ps (110 ps) for the barrel (end caps).Reconstructed charged tracks other than daughters of K

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“…On the theoretical side, charmonium electromagnetic transitions have been investigated using various theoretical methods [6][7][8][9][10][11][12][13][14]. In principle, these processes involve both electromagnetic and strong interactions, the former being perturbative in nature while the latter being non-perturbative.…”

Section: Introductionmentioning

confidence: 99%

Two-photon decays of $$\eta _c$$ η c from lattice QCD

Chen

Gong

et al. 2016

Eur. Phys. J. C

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We present an exploratory lattice study for the two-photon decay of η c using N f = 2 twisted mass lattice QCD gauge configurations generated by the European Twisted Mass Collaboration. Two different lattice spacings of a = 0.067 fm and a = 0.085 fm are used in the study, both of which are of physical size of 2 fm. The decay widths are found to be 1.025(5) KeV for the coarser lattice and 1.062(5) KeV for the finer lattice, respectively, where the errors are purely statistical. A naive extrapolation toward the continuum limit yields 1.122(14) KeV, which is smaller than the previous quenched result and most of the current experimental results. Possible reasons are discussed.

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Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′

Cited by 26 publications

References 43 publications

Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
34
1
8
0
View full text Add to dashboard Cite

Two-photon decays of $$\eta _c$$ η c from lattice QCD

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Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′

Cited by 26 publications

References 43 publications

Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

First Observation of theM1Transitionψ(3686)→γηc(2SAblikim1, Ачасов2, Ambrose3 et al. 2012Phys. Rev. Lett.34180View full textAdd to dashboardCite

Two-photon decays of $$\eta _c$$ η c from lattice QCD

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About

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
34
1
8
0
View full text Add to dashboard Cite