scholarly journals Exotic meson decays and polarization asymmetry in hadron environment with chiral imbalance

2018 ◽  
Vol 191 ◽  
pp. 05014 ◽  
Author(s):  
A.E. Putilova ◽  
A.V. Iakubovich ◽  
A.A. Andrianov ◽  
V.A. Andrianov ◽  
D. Espriu
Keyword(s):  
Chemical Potential ◽  
Photon Polarization ◽  
Polarization Asymmetry ◽  
Exotic Meson ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Pion Polarizability ◽  
Vacuum States ◽  
Light Scalar ◽  
The Difference

The possibility of the formation of a local parity breaking in a quark-hadron medium is described as a result of a violation of chiral symmetry, i.e, the difference between the average numbers of right and left -handing quarks in the fireball after HIC.The phenomenology of LPB in the fireball induces the introduction of a topological charge and, accordingly, a topological (chiral) chemical potential. Using the effective meson Lagrangian motivated by QCD in the chiral medium the properties of light scalar and pseudoscalar mesons are analyzed. It is establish that exotic decays of scalar mesons arise as a result of mixing of π and a0 vacuum states in the presence of chiral imbalance. The pion electromagnetic formfactor obtains a parity-odd supplement which generates a photon polarization asymmetry in pion polarizability. We consider that the above-mentioned properties of LPB can be revealed in experiments on LHC, RHIC, CBM FAIR and NICA accelerators.

TO LEARN LIGHT SCALARS FROM SEMILEPTONIC DECAYS OF HEAVY QUARKONIA

2014 ◽  
Vol 35 ◽  
pp. 1460447 ◽  
Author(s):  
N. N. ACHASOV ◽  
A. V. KISELEV
Keyword(s):  
Dominant Role ◽  
Semileptonic Decays ◽  
Heavy Quarkonia ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Light Scalar

We study the mechanism of production of the light scalar mesons in the [Formula: see text] decays: [Formula: see text], and compare it with the mechanism of production of the light pseudoscalar mesons in the [Formula: see text] decays: [Formula: see text]. We show that the [Formula: see text] transition is negligibly small in comparison with the [Formula: see text] one. As for the the f0(980) meson, the intensity of the [Formula: see text] transition is not more thirty percent from the intensity of the [Formula: see text] ([Formula: see text]) transition. So, the [Formula: see text] decay supports the previous conclusions about a dominant role of the four-quark components in the σ(600) and f0(980) mesons.

scholarly journals CLASSIFICATION OF THE SCALAR MESONS: A STRANGE POLE EXPEDITION INTO CHARM AND BEAUTY TERRITORY

2004 ◽  
Vol 19 (26) ◽  
pp. 1949-1967 ◽  
Author(s):  
EEF VAN BEVEREN ◽  
GEORGE RUPP
Keyword(s):  
Cross Sections ◽  
Bound States ◽  
Bound State ◽  
S Wave ◽  
Exotic Meson ◽  
Scalar Mesons ◽  
S Matrix ◽  
Light Scalar ◽  
Scalar Sector

The classification of scalar and vector mesons is reviewed within the framework of the Resonance-Spectrum Expansion (RSE). This method allows a simple and straightforward description of non-exotic meson–meson scattering, incorporating the effects of quark confinement and OZI-allowed decay in a fully nonperturbative way. Results for resonances and bound states are compared to experiment, on the basis of computed pole positions and cross-sections. New predictions for open-charm and -bottom scalar mesons are presented.Concretely, observed vector states for [Formula: see text] and [Formula: see text] are reproduced, and others are predicted. In the light scalar sector, the now established two nonets, one below 1 GeV and one in the region 1.3–1.5 GeV, are easily described, through the appearance of extra poles in the S-matrix. The recently found [Formula: see text](2317) meson is accurately reproduced by the same mechanism, as a quasi-bound state in the coupled [Formula: see text] system.In S-wave Dπ and Bπ scattering, new resonances are foreseen close to threshold, i.e. a [Formula: see text] at 2.16±0.05 GeV some 250 MeV wide, and a [Formula: see text] at 5.47±0.05 GeV with a width of about 50 MeV. Additional predictions concern the existence of [Formula: see text] and [Formula: see text] scalar mesons, stable with respect to OZI-allowed decay to BK and BD, respectively, namely at 5.61±0.05 GeV resp. 6.64±0.05 GeV.

scholarly journals Decay of light scalar mesons into vector-photon and into pseudoscalar mesons

2010 ◽  
Vol 833 (1-4) ◽  
pp. 138-155 ◽  
Author(s):  
Francesco Giacosa ◽  
Giuseppe Pagliara
Keyword(s):  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Light Scalar

Studies on proper time regularization and the QCD chiral phase transition

2019 ◽  
Vol 34 (01) ◽  
pp. 1950003
Author(s):  
Yu-Qiang Cui ◽  
Zhong-Liang Pan
Keyword(s):  
Phase Transition ◽  
Small Parameter ◽  
Effective Mass ◽  
Finite Temperature ◽  
Chemical Potential ◽  
Proper Time ◽  
Chiral Phase ◽  
Chiral Phase Transition ◽  
Njl Model ◽  
The Difference

We investigate the finite-temperature and zero quark chemical potential QCD chiral phase transition of strongly interacting matter within the two-flavor Nambu–Jona-Lasinio (NJL) model as well as the proper time regularization. We use two different regularization processes, as discussed in Refs. 36 and 37, separately, to discuss how the effective mass M varies with the temperature T. Based on the calculation, we find that the M of both regularization schemes decreases when T increases. However, for three different parameter sets, quite different behaviors will show up. The results obtained by the method in Ref. 36 are very close to each other, but those in Ref. 37 are getting farther and farther from each other. This means that although the method in Ref. 37 seems physically more reasonable, it loses the advantage in Ref. 36 of a small parameter dependence. In addition, we also, find that two regularization schemes provide similar results when T [Formula: see text] 100 MeV, while when T is larger than 100 MeV, the difference becomes obvious: the M calculated by the method in Ref. 36 decreases more rapidly than that in Ref. 37.

A collisional model for light scalar mesons

2017 ◽  
Vol 32 (34) ◽  
pp. 1750179
Author(s):  
S. S. Afonin
Keyword(s):  
Simple Explanation ◽  
Decay Modes ◽  
Scalar Mesons ◽  
Light Scalar ◽  
The Given ◽  
Scalar Sector

A collisional model for hadron resonances appearing in hadron collisions is proposed. The given approach leads to a simple explanation of the scalar sector below 1 GeV with correct predictions for masses and dominant decay modes.

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