Observation of a Resonance at 4.4 GeV and Additional Structure near 4.1 GeV in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Annihilation

Siegrist, J.; Abrams, G. S.; Boyarski, A. M.; Breidenbach, M.; Bulos, F.; Chinowsky, W.; Feldman, G. J.; Friedberg, C. E.; Fryberger, D.; Goldhaber, G.; Hanson, G.; Hartill, D. L.; Jaros, J. A.; Jean‐Marie, B.; Kadyk, J. A.; Larsen, R. R.; Lüke, D.; Lüth, V.; Lynch, H. L.; Madaras, R. J.; Morehouse, C. C.; Nguyen, H. K.; Paterson, J. M.; Перл, М.; Peruzzi, I.; Pierre, F.; Piccolo, M.; Pun, T. P.; Rapidis, P. A.; Richter, B.; Sadoulet, B.; Schwitters, R. F.; Tanenbaum, W.; Trilling, G. H.; Vannucci, F.; Whitaker, J. S.; Winkelmann, F.C.; Wiss, J.

doi:10.1103/physrevlett.36.700

Cited by 120 publications

(29 citation statements)

References 9 publications

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“…Then, in the subsequent eight years from 1974 to 1982, most of charmonia listed in the present Particle Data Group (PDG) were observed, which becomes the main body of the charmonium family. Here, the typical states include J/ψ [1,2], ψ(3686) [3], ψ(4040) [4], ψ(4415) [5], ψ(3770) [6], ψ(4160) [7], χ c0 (1P) [8], χ c1 (1P) [9], χ c2 (1P) [10], η c (1S ) [11], and η c (2S ) [12]. With these observations, the Cornel model was proposed by Eichten et al [13] in 1975, from which different versions of a potential model [14][15][16][17][18][19] applied to depict the interaction between quarks were developed by different groups.…”

Section: Introductionmentioning

confidence: 99%

Possibility of charmoniumlike state X(3915) as χc0(2P)
Duan
¹
,
Luo
²
,
Liu
³

et al. 2020
Phys. Rev. D
30
2
25
0
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In this work, we seriously discuss whether X(3915) can be treated as a χ c0 (2P) state. Based on an unquenched quark model, we give the mass spectrum of the χ cJ (2P) states, where there are no free input parameters in our calculation. Our result shows that the mass gap between χ c0 (2P) and χ c2 (2P) can reach 13 MeV, which can reproduce the mass difference between Z(3930) and X(3915). Additionally, the calculated masses of χ c0 (2P) and χ c2 (2P) are consistent with experimental values of X(3915) and Z(3930), respectively. Besides, giving the mass spectrum analysis to support X(3915) as χ c0 (2P), we also calculate the width of χ c0 (2P) with the same framework, which is also consistent with the experimental data of X(3915). Thus, the possibility of charmoniumlike state X(3915) as χ c0 (2P) state is further enforced. ‡ Corresponding author * Electronic address: duanmx16@lzu.edu.cn † Electronic address: luosq15@lzu.edu.cn § Electronic address: xiangliu@lzu.edu.cn ¶ Electronic address: matsuki@tokyo-kasei.ac.jp η c (2S) 1986 h c (1P) 2003 X(3872) 2006 Z(3930) 2010 X(3915) 2013 X(3823) 2017 Y(4220) 2019 X(3842) Established charmonia XYZ states as the candidates of charmonium 17 years FIG. 1: The established charmonia and some XYZ states as possible candidates for charmonium.In 2009, focusing on 2P states, the Lanzhou group carried out the study of the mass spectrum and strong decay behav-arXiv:2002.03311v3 [hep-ph]

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Section: Introductionmentioning

confidence: 99%

Possibility of charmoniumlike state X(3915) as χc0(2P)
Duan
¹
,
Luo
²
,
Liu
³

et al. 2020
Phys. Rev. D
30
2
25
0
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show abstract

“…titatively describe not only meson spectra [34] but also baryon spectra [35]. [1,2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Here, the DD threshold is also given.…”

mentioning

confidence: 99%

Constructing J/ψ family with updated data of charmoniumlike Y states

et al. 2019

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Based on the updated data of charmoniumlike state Y(4220) reported in the hidden-charm channels of the e + e − annihilation, we propose a 4S -3D mixing scheme to categorize Y(4220) into the J/ψ family. We find that the present experimental data can support this charmonium assignment to Y(4220). Thus, Y(4220) plays a role of a scaling point in constructing higher charmonia above 4 GeV. To further test this scenario, we provide more abundant information on the decay properties of Y(4220), and predict its charmonium partner ψ(4380), whose evidence is found by analyzing the e + e − → ψ(3686)π + π − data from BESIII. If Y(4220) is indeed a charmonium, we must face how to settle the established charmonium ψ(4415) in the J/ψ family. In this work, we may introduce a 5S -4D mixing scheme, and obtain the information of the resonance parameters and partial open-charm decay widths of ψ(4415), which do not contradict the present experimental data. Additionally, we predict a charmonium partner ψ(4500) of ψ(4415), which can be accessible at future experiments, especially, BESIII and BelleII. The studies presented in this work provide new insights to establish the higher charmonium spectrum.PACS numbers: I. INTRODUCTIONIn 1974, J/ψ particle was discovered by the E598 [1] Collaboration in the p + Be → e + + e − + x reaction and the SLAC-SP-017 Collaboration [2] in the e + e − annihilation at the same time. The observation of J/ψ confirmed the existence of a charm quark predicted by the Glashow-Iliopoulos-Maiani mechanism [3]. Since then, a series of charmoniumlike states, ψ(3686) [4], ψ(3770) [5], ψ(4040) [6], ψ(4160) [7], and ψ(4415) [8], were reported, which construct a main body of the observed charmonium spectrum as shown in Particle Data Group (PDG) [9]. In Fig. 1, we collect the corresponding information of the observed charmonia with the year for their first discoveries. It is obvious that the year 1978 is an important time point since most of charmonia listed in the latest PDG were announced.Under this experimental background, the Cornell model was proposed by Eichten et al. [18,19], where the Cornell potential V(r) = −k/r + r/a 2 composed of Coulomb-type and linear potentials, which depicts the interaction between charm and anticharm quarks, was postulated and applied to study the observed charmonia [20]. As a successful phenomenological model, the Cornell model can describe the observed charmonia at that time. Inspired by the Cornell model, different potential models were developed by various groups [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Among these, a famous one is the Godfrey-Isgur (GI) model [34], which has semi-relativistic expression of the kinetic and potential energy terms. The GI model was employed to quan- * Electronic address:

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“…Final state R J=c (MeV) 2ð þ À Þ 85:1 AE 7:9 3ð þ À Þ 106 AE 10 2ð þ À 0 Þ 99:1 AE 6:5 For a quarter of a century our knowledge of the vector charmonia above the threshold of open-charm production (throughout this section referred to as c states) was based on the pioneer experiments of Mark-I (Siegrist et al, 1976) and DASP (Brandelik et al, 1978). Even such basic parameters of the c mesons as mass, width, and leptonic width were known with large uncertainties mainly determined by low statistics of the old experiments.…”

Section: Isr Studies In the Charmonium Regionmentioning

confidence: 99%

Hadron production viae+e−collisions with initial state radiation

et al. 2011

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A novel method of studying e þ e À annihilation into hadrons using initial state radiation at e þ e À colliders is described. After a brief history of the method, its theoretical foundations are considered. Numerous experiments in which exclusive cross sections of e þ e À annihilation into hadrons below the center-of-mass energy of 5 GeV have been measured are presented. Some applications of the experimental results to fundamental tests of the standard model are listed.

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Observation of a Resonance at 4.4 GeV and Additional Structure near 4.1 GeV ine+e−Annihilation

Cited by 120 publications

References 9 publications

Possibility of charmoniumlike state X(3915) as χc0(2P)
Duan
¹
,
Luo
²
,
Liu
³

et al. 2020
Phys. Rev. D
30
2
25
0
View full text Add to dashboard Cite

Possibility of charmoniumlike state X(3915) as χc0(2P)
Duan
¹
,
Luo
²
,
Liu
³

et al. 2020
Phys. Rev. D
30
2
25
0
View full text Add to dashboard Cite

Constructing J/ψ family with updated data of charmoniumlike Y states

Hadron production viae+e−collisions with initial state radiation

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Observation of a Resonance at 4.4 GeV and Additional Structure near 4.1 GeV ine+e−Annihilation

Cited by 120 publications

References 9 publications

Possibility of charmoniumlike state X(3915) as χc0(2P)Duan1, Luo2, Liu3 et al. 2020Phys. Rev. D302250View full textAdd to dashboardCite

Possibility of charmoniumlike state X(3915) as χc0(2P)Duan1, Luo2, Liu3 et al. 2020Phys. Rev. D302250View full textAdd to dashboardCite

Constructing J/ψ family with updated data of charmoniumlike Y states

Hadron production viae+e−collisions with initial state radiation

Contact Info

Product

Resources

About

Possibility of charmoniumlike state X(3915) as χc0(2P)
Duan
¹
,
Luo
²
,
Liu
³

et al. 2020
Phys. Rev. D
30
2
25
0
View full text Add to dashboard Cite

Possibility of charmoniumlike state X(3915) as χc0(2P)
Duan
¹
,
Luo
²
,
Liu
³

et al. 2020
Phys. Rev. D
30
2
25
0
View full text Add to dashboard Cite