scholarly journals QCD sum rule calculation for the charmonium-like structures in the J/ψϕ and J/ψω invariant mass spectra

2011 ◽  
Vol 701 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Stefano I. Finazzo ◽  
Marina Nielsen ◽  
Xiang Liu
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Sum Rule ◽  
Invariant Mass Spectra

scholarly journals QCD sum rule studies on the $$s s {\bar{s}} {\bar{s}}$$ tetraquark states of $$J^{PC} = 0^{-+}$$

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Rui-Rui Dong ◽  
Niu Su ◽  
Hua-Xing Chen ◽  
Er-Liang Cui ◽  
Zhi-Yong Zhou
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Sum Rules ◽  
Tetraquark State ◽  
Qcd Sum Rules ◽  
Sum Rule ◽  
Invariant Mass Spectra

Abstract We apply the method of QCD sum rules to study the $$s s {\bar{s}} {\bar{s}}$$sss¯s¯ tetraquark states of $$J^{PC} = 0^{-+}$$JPC=0-+. We construct all the relevant $$s s {\bar{s}} {\bar{s}}$$sss¯s¯ tetraquark currents, and find that there are only two independent ones. We use them to further construct two weakly-correlated mixed currents. One of them leads to reliable QCD sum rule results and the mass is extracted to be $$2.51^{+0.15}_{-0.12}$$2.51-0.12+0.15 GeV, suggesting that the X(2370) or the X(2500) can be explained as the $$ss{\bar{s}}{\bar{s}}$$sss¯s¯ tetraquark state of $$J^{PC} = 0^{-+}$$JPC=0-+. To verify this interpretation, we propose to further study the $$\pi \pi /K {\bar{K}}$$ππ/KK¯ invariant mass spectra of the $$J/\psi \rightarrow \gamma \pi \pi \eta ^\prime /\gamma K {\bar{K}} \eta ^\prime $$J/ψ→γππη′/γKK¯η′ decays in BESIII to examine whether there exists the $$f_0(980)$$f0(980) resonance.

scholarly journals YN CORRELATIONS FROM THE STOPPED K− REACTION ON 4He

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2520-2523 ◽  
Author(s):  
T. SUZUKI ◽  
M. IIO ◽  
K. ITAHASHI ◽  
M. IWASAKI ◽  
Y. MATSUDA ◽  
...  
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Absorption Process ◽  
Isospin Dependence ◽  
First Time ◽  
Invariant Mass Spectra

We have investigated non-mesonic reactions of the stopped K− on 4 He in terms of correlations of coincident ΛN pairs. As the result, Λp and Λn branches of the two-nucleon absorption process were clearly observed in the ΛN invariant mass spectra. The spin-isospin dependence of the process was observed for the first time.

scholarly journals Apparent and Actual Shifts in Mass and Width of ϕ Mesons Produced in Heavy-Ion Collisions

1997 ◽  
Vol 12 (02) ◽  
pp. 127-134 ◽  
Author(s):  
R. S. Bhalerao ◽  
S. K. Gupta
Keyword(s):  
Invariant Mass ◽  
Preliminary Data ◽  
Heavy Ion Collisions ◽  
Mass Spectra ◽  
Dense Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Mass Shift ◽  
Ion Collisions ◽  
Invariant Mass Spectra

We present a method of analyzing invariant-mass spectra of kaon pairs resulting from decay of ϕ mesons produced in high-energy heavy-ion collisions. It can be used to extract the shifts in the mass and the width (ΔM and ΔΓ) of the ϕ mesons when they are inside the dense matter formed in these collisions. We illustrate our method with the help of available preliminary data. Extracted values of ΔM and ΔΓ are significantly larger than those obtained with an earlier method. Our results are consistent with the experimentally observed pT dependence of the mass shift. Finally, we present a phenomenological relation between ΔM and ΔΓ. It provides a useful constraint on theories which predict the values of these two quantities.

The initial single chiral particle emission mechanism and its predictions of charmonium-like structures

2014 ◽  
Vol 29 ◽  
pp. 1460223
Author(s):  
Dian-Yong Chen
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Particle Emission ◽  
Emission Mechanism ◽  
Mass Distributions ◽  
Invariant Mass Spectra

We propose a new mechanism, named as the initial single chiral particle emission mechanism, to explain the charged Zb(10610) and Zb(10650) observed in the ϒ(5S) → π+π-ϒ(nS), π+π-hb(mP), (n = 1 ~ 3, m = 1, 2) processes. After successfully interpreting the charge Zb structures, we extend this mechanism to study the process of the dipion transitions between the higher charmonia/charmonium-like state and the lower charmonia. In these transitions process, we predict two charmonium analogs of the charged Zb. After the observations of Zc(3900) by the BESIII and the Belle Collaborations, we reproduce the dipion and the J/ψπ invariant mass distributions simultaneously with the initial single chiral particle emission mechanism. In addition, we predict some enhancements in the J/ψK invariant mass spectra in the dikaon decay of the higher charmonium and the charmonium like states.

A correlated background in invariant mass spectra of three-body systems

2000 ◽  
Vol 673 (1-4) ◽  
pp. 143-156 ◽  
Author(s):  
C. Forssén ◽  
B. Jonson ◽  
M.V. Zhukov
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Three Body ◽  
Invariant Mass Spectra

Nuclei as generators of quasireal photons: Testing an equivalent-photon method for calculating invariant-mass spectra

1974 ◽  
Vol 10 (5) ◽  
pp. 1561-1575 ◽  
Author(s):  
C. Carimalo ◽  
G. Cochard ◽  
P. Kessler ◽  
J. Parisi ◽  
B. Roehner
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Equivalent Photon ◽  
Invariant Mass Spectra

scholarly journals Factorization and resummation for dijet invariant mass spectra

2012 ◽  
Vol 85 (7) ◽  
Author(s):  
Christian W. Bauer ◽  
Frank J. Tackmann ◽  
Jonathan R. Walsh ◽  
Saba Zuberi
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Invariant Mass Spectra
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