1,721,063 research outputs found
Modifications on nucleon parameters at finite temperature
No full textAzizi, Kazem (Dogus Author)Taking into account the additional operators coming up at finite temperature, we investigate the mass and residue of the nucleon in the framework of thermal QCD sum rules. We observe that the mass and residue of the nucleon are initially insusceptible to the increase of temperature, however, after a certain temperature, they start to fall with increasing the temperature
Thermal behavior of the mass and residue of hyperons
No full textAzizi, Kazem (Dogus Author) -- Kaya, Gülşah (Dogus Author)We investigate the mass and residue of Sigma, Lambda and Xi hyperons at finite temperature in the framework of thermal QCD sum rules. In our calculation, we take into account the additional operators coming up at finite temperature. We find the temperature-dependent continuum threshold for each hyperon using the obtained sum rules for their mass and residue. The numerical results demonstrate that the mass and residue of the particles under consideration remain stable up to a certain temperature, after which they decrease by increasing the temperature
Radiative transition of negative to positive parity nucleon
No full textAzizi, Kazem (Dogus Author)We investigate the N*(1535) -> N gamma transition in the framework of light cone QCD sum rules. In particular, using the most general form of the interpolating current for the nucleon as well as the distribution amplitudes of the photon, we calculate two transition form factors responsible for this channel and use them to evaluate the decay width and branching ratio of the transition under consideration. The result obtained for the branching fraction is in good agreement with the experimental data
g DsDK*0 and g BsDK*0 coupling constants in QCD sum rules
No full textAzizi, Kazem (Dogus Author) -- This paper was firstly submitted to 3rd International Conference on Hadron Physics.In the present study, we calculate the strong coupling constants g DsDK* 0(800) and g BsDK* 0(800) within the three-point QCD sum rules approach. We evaluate the correlation function of the considered vertices taking into account both D[B] and K* 0(800) mesons as off-shell states.Ozyegin University, Middle East Technical University, Canakkale Onsekiz Mart University, HadronPhysics2 Consortiu
Strong σbNB and σcND coupling constants in QCD
No full textAzizi, Kazem (Dogus Author)We study the strong interactions among the heavy bottom spin-1/2 σb baryon, nucleon and B meson as well as the heavy charmed spin-1/2 σc baryon, nucleon and D meson in the context of QCD sum rules. We calculate the corresponding strong coupling form factors defining these vertices by using a three point correlation function. We obtain the numerical values of the corresponding strong coupling constants via the most prominent structure entering the calculations
Analysis of Ds*DK1 (Bs*BK1) coupling constants within QCD sum rules
No full textAzizi, Kazem (Dogus Author) -- 3rd International Conference on Hadron Physics (TROIA’11)We compute the strong coupling constants for D*sDK1 and B*sBK1 vertices within the QCD sum rules. The coupling constants are calculated for both D(B) and K1 off-shell mesons.Ozyegin University, Middle East Technical University, Canakkale Onsekiz Mart University, HadronPhysics2 Consortiu
Analysis of the semileptonic transition of heavy Xi(Q) baryon to Xi baryon in Light Cone QCD Sum Rules
No full textAzizi, Kazem (Dogus Author) -- Confrence full title: HS'13: the proceedings of the 7th Joint International Hadron Structure'13 Conference: Tatranská Štrba, High Tatra Mountains, Slovak Republic, 30 June-4 July 2013.This study presents the analysis of form factor calculations of semileptonic transitions of heavy baryons via light cone QCD sum rules. The work covers the semileptonic transitions of the Xi(b) and Xi(c) baryons. The form factors for the transitions Xi(b) -> Xi l(+)l(-) and Xi(c) -> Xi lv are obtained using their currents in the most general form. The obtained form factors are also used to calculate the decay widths and branching ratios of the considered transitions
Exploring X(5568) as a meson molecule
Full text linkAzizi, Kazem (Dogus Author)The parameters, i.e. the mass and current coupling of the exotic X(5568) state observed by the D0 Collaboration as well as the decay width of the process X→B0sπ+X→Bs0π+ , are explored using the BK¯¯¯¯¯BK¯ molecule assumption on its structure. Employed computational methods include QCD two-point and light-cone sum rules, the latter being considered in the soft-meson approximation. The obtained results are compared with the data of the D0 Collaboration as well as with the predictions of the diquark-antidiquark model. This comparison strengthens a diquark-antidiquark picture for the X(5568) state rather than a meson molecule structure
FCNC transition of Sigma(Q) to nucleon
No full textAzizi, Kazem (Dogus Author) -- Conference full title: 35th International Conference of High Energy Physics, (ICHEP) 2010; Paris; France; SISSA; 22 July 2010 throught 28 July 2010.The loop level flavor changing neutral current transitions of the Sigma(b) -> nl(+)l(-) and Sigma(c) -> p l(+)l(-) are investigated in full QCD and heavy quark effective theory in the light cone QCD sum rules approach. Using the most general form of the interpolating current for E-Q, Q = b or c, the transition form factors are calculated using two sets of input parameters entering the nucleon distribution amplitudes. The obtained results are used to estimate the decay rates of the corresponding transitions
Magnetic dipole moment of Z(b)(10610) in light-cone QCD
Full text linkAzizi, Kazem (Dogus Author) -- Özdem, Ulaş (Dogus Author)The magnetic dipole moment of the exotic Z(b)(10610) state is calculated within the light cone QCD sum rule method using the diquark-antidiquark and molecule interpolating currents. The magnetic dipole moment is obtained as mu(Zb) = 1.73 +/- 0.63 mu(N) in diquark-antidiquark picture and mu(Zb) = 1.59 +/- 0.58 mu(N) in the molecular case. The obtained results in both pictures together with the results of other theoretical studies on the spectroscopic parameters of the Zb(10610) state may be useful in determination of the nature and quark organization of this state
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