Lineshape of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3770</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>and low-lying vector charmonium resonance parameters in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>D</mml:mi><mml:mover accent="true"><

Zhang, Yuan-Jiang; Zhao, Qiang

doi:10.1103/physrevd.81.034011

Cited by 28 publications

(15 citation statements)

References 49 publications

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“…We also include the coupled channel effects due to the nearby AE c N and AE Ã c N thresholds. The coupled channel effects in the heavy quark scenario probably have sizable contributions even though the thresholds are not very close to each other, which may be realized from the discussions about the resonance effects for the D " D production [39,40]. It is interesting to investigate how important the coupled channel effects are for the formation of the Ã c N bound states.…”

Section: Introductionmentioning

confidence: 99%

ΛcNbound states revisited

2012

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The one-boson exchange potential model for Ã c N is constructed and the possibility of Ã c N bound states is examined. We consider an effective Lagrangian for the charmed baryons, Ã c , AE c , and AE Ã c , reflecting the heavy quark symmetry, chiral symmetry, and hidden local symmetry. We determine the coupling constants using various methods. With the derived nonrelativistic potentials, we study the bound state problem of the Ã c N system and relevant coupled channel effects. It is found that molecular bound states of Ã c N are plausible, for which the channel couplings of AE c N and AE Ã c N are essential.Lagrangians satisfying the heavy quark symmetry for heavy baryons, chiral symmetry for pions, and hidden local symmetry for vector mesons. The Lagrangian is analogous to the heavy meson version presented in Ref. [42]. As for the unknown coupling constants, we turn to the quark model, chiral multiplets, vector meson dominance, and QCD sum rule. Extension of the study to the bottom case is also interesting, but we would not explore it here. Our paper is organized as follows. After the introduction, we present the effective Lagrangians in Sec. II. Then we determine the coupling constants with various methods in Sec. III. In Sec. IV, we present the derived potentials. The numerical results for the S-wave spin-singlet and triplet Ã c N are given in Secs. V and VI, respectively. Finally, we present our discussions and conclusions in Sec. VII. II. THE LAGRANGIANHere, we consider the S-wave Ã c N states and the channels which couple to them, i.e., the I ¼ 1 2 and J P ¼ 0 þ or 1 þ two-baryon states. We consider the contributions from the AE c N and AE Ã c N channels. It is a 3-channel problem for J P ¼ 0 þ and 7-channel problem for J P ¼ 1 þ . The labels are listed in Table I. Because of the higher mass, we assume that the Áð1232Þ contributions are negligible.In the heavy quark limit, the ground state heavy baryons Qqq form SUð3Þ antitriplet with J P ¼ 1 2 þ and two degenerate sextets with J P ¼ ð 1 2 ; 3 2 Þ þ . As in Ref.[43], we use B" 3 , B 6 , and B Ã 6 to denote these multiplets. To write down the compact form of the Lagrangians, we use the notation of the superfield S , which is defined by

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Section: Introductionmentioning

confidence: 99%

ΛcNbound states revisited

2012

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“…A recent study of the e þ e À ! D " D cross section line shape [35] suggests that g c 0 DD ' g J=c DD , and we will discuss later that to coherently account for the partial widths of J=c and c 0 ! c ð 0 c Þ would impose a strong constraint on the ratio of g c 0 DD =g J=c DD .…”

Section: Numerical Resultsmentioning

confidence: 98%

“…Since these processes should share the same form factor parameter , the main parameter difference is the coupling between J=c ðc 0 Þ to D ðÃÞ " D ðÃÞ for which the analysis of Ref. [35] suggests that a smaller value for g c 0 DD should be applied.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…D [35], where a relatively smaller value of g c 0 DD was favored. It is interesting to see that the IML effects in J=c !…”

Section: Discussionmentioning

confidence: 96%

“…(iii) It was noticed in Refs. [35,36] that the D Ã " D Ã ðDÞ loops were rather important. Thus, we include all the S-wave D mesons in the loop calculations to estimate the leading contributions from the IML.…”

Section: Introductionmentioning

confidence: 98%

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Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′
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With the new measurements of J=c and c 0 ! c ð 0 c Þ from the CLEO and BES-III collaboration, we reinvestigate the intermediate meson loop (IML) contributions to these radiative decays in association with the quark model M1 transitions in an effective Lagrangian approach. It shows that the ''unquenched'' effects due to the intermediate hadron loops can be better quantified by the new data for J=c ! c . Although the IML contributions are relatively small in J=c ! c , they play a crucial role in c 0 ! c ð 0 c Þ. A prediction for the IML contributions to c ð3770Þ ! c ð 0 c Þ is made. Such unquenched effects allow us to reach a coherent description of those three radiative transitions, and gain some insights into the underlying dynamics.

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Line-shape and poles of the ψ(3770)

Coito

Giacosa

2019

Nuclear Physics A

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We study the non-Breit-Wigner line-shape of the ψ(3770) resonance, predominantly a 1 3 D 1c c state, using an unitarized effective Lagrangian approach, including the one-loop effects of the nearby thresholds D + D − and D 0D0 . A fit of the theoretical result to the total cross-section e + e − → DD is performed, leading to a good description of data (χ 2 /d.o.f. ∼ 1.03). The partial cross sections e + e − → D 0D0 and e + e − → D + D − turn out to be separately in good agreement with the experiment. We find a pole at 3777−i12 MeV, that is within the Particle Data Group (PDG) mass and width estimation for this state. Quite remarkably, we find an additional, dynamically generated, companion pole at 3741 − i19 MeV, which is responsible for the deformation on the lower energy side of the line-shape. The width for the leptonic decay ψ(3770) → e + e − is 112 eV, hence smaller than the PDG fit of 262 ± 18 eV, yet in agreement with a recent experimental study. 45 monium seed state, which gets dressed by "clouds" of D + D − and D 0D0 mesons.Our aim is to study the deformation seen on the left side of the resonance in Ref.[9] with mesonic loops combined with the nearby thresholds. To this end, we use an effective relativistic Lagrangian approach in which a single vector state ψ ≡ ψ(3770) is coupled to channels D + D − and D 0D0 , as well as to lepton 50 pairs. The propagator of ψ is calculated at the resummed one-loop level and fulfills unitarization requirements. Then, we perform a fit of the four parameters of our approach, i.e. the effective couplings of ψ to DD and of ψ to leptons, the mass of ψ, and a cutoff responsible for the finite dimension of the ψ meson, to the experimental cross-section of the reaction e + e − → DD in Refs. [7] and 55[5], in the energy region up to 100 MeV above the D 0D0 threshold. We assume that the ψ(3770) resonance dominates in this energy range. We obtain a very good description of the data, which in turn allows us to determine in a novel and independent way the mass, width, and branching ratios of the ψ(3770).Moreover, we study in detail, to our knowledge for the first time, the poles of 60 this state. In fact, a pole was found in Ref. [16], using Fano resonances, at about 3778 − i14 MeV, though in lesser detail. Quite remarkably, we find two poles for this resonance, one which roughly corresponds to the peak of the resonance, the seed pole, and one additional dynamically generated pole, responsible for the enhancement left from the peak, which emerges due to the strong coupling function, turns out to be rather small, possibly due to the fact that the ψ(3770)

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Lineshape ofψ(3770)and low-lying vector charmonium resonance parameters ine+e−→D<

Cited by 28 publications

References 49 publications

ΛcNbound states revisited

ΛcNbound states revisited

Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′
Li
¹
,
Zhao
²

2011
Phys. Rev. D
Self Cite
26
0
3
0
View full text Add to dashboard Cite

Line-shape and poles of the ψ(3770)

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Lineshape ofψ(3770)and low-lying vector charmonium resonance parameters ine+e−→D<

Cited by 28 publications

References 49 publications

ΛcNbound states revisited

ΛcNbound states revisited

Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′Li1, Zhao2 2011Phys. Rev. DSelf Cite26030View full textAdd to dashboardCite

Line-shape and poles of the ψ(3770)

Contact Info

Product

Resources

About

Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′
Li
¹
,
Zhao
²

2011
Phys. Rev. D
Self Cite
26
0
3
0
View full text Add to dashboard Cite