98,967 research outputs found
Joshua Davis: Author of Spare Parts
No full textCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
The nonet of the light scalar tetraquarks: The mesons a(0)(980) and K-0*(800)
No full textAzizi, Kazem (Dogus Author)The spectroscopic parameters and partial decay widths of the light mesons a(0)(980) and K-0*(800) are calculated by treating them as scalar diquark-antidiquark states. The masses and couplings of the mesons are found in the framework of QCD two-point sum rule approach. The widths of the decay channels a(o)(980) -> eta pi and a(0)(980) -> K (K) over bar, and K-0*(800) -> K+pi(-) and K-0*(800) -> K-0 pi(0) are evaluated using QCD sum rules on the light-cone and technical tools of the soft meson approximation. Our results for the mass of the mesons m(ao) = 991(-27)(+29) MeV and m(K)* = 767(-29)(+38) MeV, as well as their total width Gamma(a0) = 62.01 +/- 14.37 MeV and Gamma K-0* = 401.1 +/- 87.1 MeV are compared with last experimental data
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
John Harris, K. P. Kannan, Gerry Rodgers, Urban labour market structure and job access in India : a study of Coimbatore
No full textAzizi Karim. John Harris, K. P. Kannan, Gerry Rodgers, Urban labour market structure and job access in India : a study of Coimbatore. In: Tiers-Monde, tome 36, n°142, 1995. Pauvretés, sous la direction de Bruno Lautier et Pierre Salama. pp. 450-452
Analyses of gD*sDK and gB*sBK vertices in QCD sum rules
No full textAzizi, Kazem (Dogus Author) -- This paper was firstly submitted to 2nd International Conference on Particle Physics in Memoriam Engin Arik and Her Colleagues.The coupling constants g D*sDK and g B*sBK are calculated in the framework of QCD sum rules. We evaluate the correlation functions of these vertices considering both D(B) and K mesons off-shell and obtain the results as g D*sDK = (2.89 ± 0.25) and g B*sBK = (3.01 ± 0.28)
Light scalar K-0* (700) meson in vacuum and a hot medium
No full textAzizi, Kazem (Dogus Author) -- Barsbay, Birten (Dogus Author)The K-0* (700) meson appears as the lightest strange scalar meson in Particle Data Group (PDG). Although there were a lot of experimental and theoretical efforts to establish this particle and determine its properties and nature, it still needs confirmation in an experiment, and its internal quark-gluon organization needs to be clarified. In this connection, we study some spectroscopic properties of this state in a hot medium as well as a vacuum by modeling it as a usual meson of a quark and an antiquark. In particular, we investigate its mass and coupling or decay constant in terms of the temperature of a hot medium by including the medium effects by the fermionic and gluonic parts of the energy-momentum tensor as well as the temperature-dependent continuum threshold, quark, gluon, and mixed condensates. We observe that the mass of K-0* (700) remains unchanged up to T similar or equal to 0.6T(c) with T-c being the critical temperature, but it starts to diminish after this point and approaches zero near to the critical temperature referring to the melting of the meson. The coupling of K-0* (700) is also sensitive to T at higher temperatures. It starts to grow rapidly after T similar or equal to 0.85T(c). We turn off the medium effects and calculate the mass and coupling of the K-0* (700) state at zero temperature. The obtained mass is in accord with the average Breit-Wigner mass value reported by PDG
Decuplet baryons in a hot medium
No full textAzizi, Kazem (Dogus Author) -- Bozkır, G. (Dogus Author)The thermal properties of the light decuplet baryons are investigated in the framework of the thermal QCD sum rules. In particular, the behavior of the mass and residue of the Delta, Sigma*, Xi*, and Omega baryons with respect to temperature are analyzed taking into account the additional operators appearing in the Wilson expansion at finite temperature. It is found that the mass and residue of these particles remain overall unaffected up to T similar or equal to 150 MeV but, beyond this point, they start to diminish considerably
Analysis of the structure of Xi (1690) through its decays
No full textAzizi, Kazem (Dogus Author)The mass and pole residue of the first orbitally and radially excited Xi state as well as the ground state residue are calculated by means of the two-point QCD sum rules. Using the obtained results for the spectroscopic parameters, the strong coupling constants relevant to the decays Xi (1690) -> Sigma K and Xi (1690) -> Lambda K are calculated within the light-cone QCD sum rules and width of these decay channels are estimated. The obtained results for the mass of (Xi) over tilde and ratio of the Br((Xi) over tilde -> Sigma K)/Br((Xi) over tilde -> Lambda K), with (Xi) over tilde representing the orbitally excited state in Xi channel, are in nice agreement with the experimental data of the Belle Collaboration. This allows us to conclude that the Xi (1690) state, most probably, has negative parity
Magnetic dipole moment of Z(b)(10610) in light-cone QCD
No full textAzizi, 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
Decay widths of the excited Omega(b) baryons
No full textAzizi, Kazem (Doğuş Author)The LHCb Collaboration recently observed five narrow Omega(0)(c) resonances and measured their masses and widths through the decays Omega(0)(c) -> Xi(+)(c) K-. Motivated by this discovery, and also by the fact that the groundstate bottom baryon Omega(-)(b) with spin 1/2 was already found experimentally, we perform a theoretical investigation of the spin-1/2 and spin-3/2, Omega(b), baryons by calculating the decay width of their first orbitally and radially excited states to Xi(0)(b) K-. For this purpose, we employ the QCD sum rule method on the light cone by including in the analysis the K-meson distribution amplitudes up to twist 4. Obtained analytical expressions are utilized to extract parameters of these decay processes, which may be useful for forthcoming experimental studies of bottom baryons
- …
