Fen Edebiyat Fakültesihttp://hdl.handle.net/11376/1012018-02-25T13:43:21Z2018-02-25T13:43:21ZApplication of the QCD light cone sum rule to tetraquarks: The strong vertices XbXb rho and XcXc rhoAgaev, Shahin S.Azizi, KazemSundu, Hayriyehttp://hdl.handle.net/11376/30402018-02-23T01:01:13Z2016-06-30T00:00:00ZApplication of the QCD light cone sum rule to tetraquarks: The strong vertices XbXb rho and XcXc rho
Agaev, Shahin S.; Azizi, Kazem; Sundu, Hayriye
The full version of the QCD light-cone sum rule method is applied to tetraquarks containing a single heavy b or c quark. To this end, investigations of the strong vertices XbXb rho and XcXc rho are performed, where X-b = [su][(b) over bar(d) over bar] and X-c = [su][(c) over bar(d) over bar] are the exotic states built of four quarks of different flavors. The strong coupling constants G(XbXb rho) and G(XcXc rho) corresponding to these vertices are found using the rho-meson leading- and higher-twist distribution amplitudes. In the calculations, X-b and X-c are treated as scalar bound states of a diquark and antidiquark.
Azizi, Kazem (Dogus Author)
2016-06-30T00:00:00ZOn sharp asymptotic formulas for the Sturm-Liouville operator with a matrix potentialŞeref, FulyaVeliev, Oktayhttp://hdl.handle.net/11376/30392018-02-23T01:01:03Z2016-07-01T00:00:00ZOn sharp asymptotic formulas for the Sturm-Liouville operator with a matrix potential
Şeref, Fulya; Veliev, Oktay
In this article we obtain the sharp asymptotic formulas for the eigenvalues and eigenfunctions of the non-self-adjoint operators generated by a system of the Sturm-Liouville equations with Dirichlet and Neumann boundary conditions. Using these asymptotic formulas, we find a condition on the potential for which the root functions of these operators form a Riesz basis.
Şeref, Fulya (Dogus Author) -- Veliev, Oktay (Dogus Author)
2016-07-01T00:00:00ZMeasurement of the CP-violating phase phi(s) and the B-s(0) meson decay width difference with B-s(0) -> J/psi phi decays in ATLASÇetin, Serkant AliATLAS Collaborationhttp://hdl.handle.net/11376/30342018-02-17T01:01:07Z2016-08-24T00:00:00ZMeasurement of the CP-violating phase phi(s) and the B-s(0) meson decay width difference with B-s(0) -> J/psi phi decays in ATLAS
Çetin, Serkant Ali; ATLAS Collaboration
A measurement of the B-s(0) decay parameters in the B-s(0) -> J/psi/phi channel using an integrated luminosity of 14.3 fb(-1) collected by the ATLAS detector from 8TeV pp collisions at the LHC is presented. The measured parameters include the CP-violating phase phi(s), the decay width Gamma(s) and the width di ff erence between the mass eigenstates Delta Gamma(s). The values measured for the physical parameters are statistically combined with those from 4.9 fb-1 of 7TeV data, leading to the following: phi(s) = -0.090 +/- 0.078 (stat.) +/- 0.041 (syst.) rad, Delta Gamma s = 0.085 +/- 0.011 (stat.) +/- 0.007 (syst.) ps(-1), Gamma(s) = 0.675 +/- 0.003 (stat.) +/- 0.003 (syst:) ps(-1).In the analysis the parameter Delta Gamma(s) is constrained to be positive. Results for phi(s) and Delta Gamma(s) are also presented as 68% and 95% likelihood contours in the phi(s)-Delta Gamma(s) plane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions.
Çetin, Serkant Ali (Dogus Author)
2016-08-24T00:00:00ZSearch for single production of vector-like quarks decaying into Wb in pp collisions at root s=8 TeV with the ATLAS detectorÇetin, Serkant AliATLAS Collaborationhttp://hdl.handle.net/11376/30332018-02-17T01:01:31Z2016-08-08T00:00:00ZSearch for single production of vector-like quarks decaying into Wb in pp collisions at root s=8 TeV with the ATLAS detector
Çetin, Serkant Ali; ATLAS Collaboration
A search for singly produced vector-like Q quarks, where Q can be either a T quark with charge +2/3 or a Y quark with charge -4/3, is performed in proton-proton collisions recorded with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 20.3 fb(-1) and was produced with a centre-of-mass energy of root s = 8 TeV. This analysis targets Q -> Wb decays where the W boson decays leptonically. A veto on massive large-radius jets is used to reject the dominant t (t) over bar background. The reconstructed Q-candidate mass, ranging from 0.4 to 1.2 TeV, is used in the search to discriminate signal from background processes. No significant deviation from the Standard Model expectation is observed, and limits are set on the Q -> Wb cross-section times branching ratio. The results are also interpreted as limits on the QWb coupling and the mixing with the Standard Model sector for a singlet T quark or a Y quark from a doublet. T quarks with masses below 0.95 TeV are excluded at 95 % confidence level, assuming a unit coupling and a BR(T -> Wb) = 0.5, whereas the expected limit is 1.10 TeV.
Çetin, Serkant Ali (Dogus Author)
2016-08-08T00:00:00Z