Browsing by Author "Veliev, E. V."

Now showing 1 - 4 of 4

Open Access
Axial-tensor meson family at T≠0
(Springer Nature, 2020-10-12) Süngü, J. Y.; Türkan, Arzu; Sertbakan, E.; Veliev, E. V.; Natural and Mathematical Sciences; TÜRKAN, Arzu
The mass and decay constants of rho(2), omega(2) and a missing member in the 2(--) nonet along with their first excited states are analyzed by the Thermal QCD sum rules approach, including QCD condensates up to dimension five. Mass and decay constant values of these mesons are stable from T = 0 up to T congruent to 120 MeV. However, after this threshold point, our numerical analyses indicates that they begin to diminish with increasing temperature. When we compare the hadronic parameters with their vacuum values, masses of these mesons and their first excited states decrease between (1-13%) from the PDG data and (10-26%) for the decay constants. However they diminish in the interval of (9-26%) and (2-34%) respectively with regards to Regge Trajectory Model data. We expect our numerical results will be confirmed by future heavy-ion collision experiments.
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Dissociation of pseudotensor mesons π2(1670), η2(1645) and η2(1870) through critical temperature
(Springer, 2022-09-27) Türkan, Arzu; Süngü, J. Y.; Güngör, E.; Reisoğlu, H.; Veliev, E. V.; Natural and Mathematical Sciences; TÜRKAN, Arzu
We have computed the masses and decay constants of isotriplet π2(1670), the isoscalar η2(1645) and η2(1870) states as the ground-state nonet of 1 1D2 case within the Thermal QCD sum rules framework. This method is applied to the spectral changes of pseudotensor mesons at high temperatures including quark, gluon, and mixed condensates up to the five dimensions. We found that their masses and decay constants are insensitive to temperature in low-temperature region. At the near critical temperature, we observed an exponential decrease of the masses of π2(1670), η2(1645) and η2(1870), but while the decay constant of π2(1670) is fallen, that of η2(1645) and η2(1870) is increased as a function of temperature. The modification of condensates at T≠ 0 is crucial to the change of considered mesons properties in hot medium. We discuss and interpret the implications of the physical meaning of our results.
Open Access
Impact of a thermal medium on newly observed Zcs(3985) resonance and its b-partner
(Springer, 2022-05-17) Süngü, J. Y.; Türkan, Arzu; Sundu, H.; Veliev, E. V.; Natural and Mathematical Sciences; TÜRKAN, Arzu
Motivated by the very recent discovery of the strange hidden-charm exotic state Zcs(3985) by the BESIII Collaboration, we study the possible interpretation of this exotic state the both at T= 0 and T≠ 0. We analytically compute the mass and meson-current coupling constant of this resonance with spin-parity JP= 1 + at finite temperature approximation up to the sixth order of the thermal operator dimension including non-perturbative contributions. Extracting thermal mass and meson-current coupling constant sum rules, the modifications on properties of the Zcs(3985) state in hot medium are determined. As a by-product, the hadronic parameters of the bottom partner of Zcs(3985) is estimated as well. The search for temperature effects on the hadronic parameters of the hidden-charm meson Zcs(3985) and the bottom partner enable us to understand the phase transitions, chiral symmetry breaking, and the properties of hot-dense matter in QCD. Moreover, the full width of the resonance Zcs(3985) is calculated as (12.0±0.8)MeV using the strong decay in the tetraquark picture. Results for width and mass are in reasonable agreement with existing experimental data and results of other theoretical works. The information obtained about the parameters of the considered states is useful for experimental investigations of exotic mesons.
Open Access
In the pursuit of X(5568) and its charmed partner
(Jagellonian University, 2019-09) Süngü, J. Y.; Türkan, Arzu; Veliev, E. V.; Natural and Mathematical Sciences; TÜRKAN, Arzu
The recent observation by the D empty set Collaboration of the first tetraquark candidate with four different quark flavors (u, d, s and b) in the B-s(0)pi(+/-) channel having a narrow structure has still not been confirmed by other collaborations. Further independent experiments are required either to confirm the X(5568) state or to set limits on its production. Though quantum numbers are not exactly clear, the results existing in the literature indicate that it is probably an axial-vector or scalar state candidate. In this study, mass and pole residue of the X (5568) resonance assumed as a tightly bound diquark, with spin-parity both J(P) = 1(+) or J(PC) = 0(++) are calculated using two-point Thermal SVZ Sum Rules technique by including condensates up to dimension six. Moreover, its partner in the charm sector is also discussed. Investigations defining the thermal properties of X(5568) and its charmed partner may provide valuable hints and information for the upcoming experiments such as CMS, LHCb and PANDA.