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DAĞ, Hüseyin

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Hüseyin

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DAĞ
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Now showing 1 - 10 of 12
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    Theoretical determination of K(1)(1270,1400) mixing angle in QCD
    (IOP Publishing, 2012) Dağ, Hüseyin; Ozpineci, A.; Çağıl, A.; Erkol, Güray; Natural and Mathematical Sciences; ERKOL, Güray; DAĞ, Hüseyin
    In quark model, the strange axial vector mesons K1(1270) and K1(1400) are defined as the mixtures of orbital angular momentum states K1A and K1B. In this work, by using the orthogonality of the mass eigenstates, we have estimated the K1(1270, 1400) mixing angle θK1, where we have found that θK1 sime −(39 ± 4)°.
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    Mass and pole residue of Yb(10890) state with JPC = 1−− at finite temperature
    (AIP Publishing, 2019) Süngü, J. Y.; Türkan, Arzu; Dağ, Hüseyin; Veliev, V.; Natural and Mathematical Sciences; TÜRKAN, Arzu; DAĞ, Hüseyin
    The status of the hidden beauty state Y-b is not clear up to now. The deviations from the expected behavior can provide a clue to consider it as an exotic meson candidate. Assuming the Y-b resonance as a tetraquark, we estimated its mass and pole residue, both at vacuum and T not equal 0 temperatures by calculating hot-medium contributions to hadronic parameters in the framework of Thermal QCD sum rules. Our results depict that the mass and pole residue values decrease dramatically at the vicinity of a critical temperature. Comparison of our results with the recent experimental data and theoretical results might be helpful in understanding the internal structure of bottomonium-like Y-b state.
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    Conference ObjectPublicationOpen Access
    Hot medium effects on pseudotensor K2(1820) meson
    (EDP Sciences, 2019) Türkan, Arzu; Dağ, Hüseyin; Süngü, J. Y.; Veliev, V.; Natural and Mathematical Sciences; Wronska, A.; Magiera, A.; Przygoda, W.; TÜRKAN, Arzu; DAĞ, Hüseyin
    The investigation of mesons in hot medium can give valuable information about the nature of QCD vacuum and deconfinement phase transitions. In this study, thermal properties of pseudotensor K-2(1820) meson is examined via QCD sum rules at finite temperature. The mass and the decay constant of K-2(1820) are estimated up to dimension-five by considering the new operators emerging at finite temperature. It is seen that after a certain temperature, the decay constant and the mass decrease significantly due to the hot medium effects.
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    Investigation of P-wave scalar and S-wave pseudo-scalar charmonia semileptonic transitions to the Ds(D) meson in QCD
    (IOP Publishing, 2010) Dağ, Hüseyin; Azizi, K.; Bashiri, V.; Natural and Mathematical Sciences; DAĞ, Hüseyin
    In this work, the semileptonic decays of the scalar charmonium state Xc0 and the pseudo scalar charmonia states ηc(1s) and ηc(2s) into Ds and D mesons are analyzed. The form factors of the transitions Xc0 → Ds(D)_ν and ηc(1s, 2s) → Ds(D)_ν are calculated within the framework of the threepoint QCD sum rules. The results of the form factors are used to estimate the decay widths of the charmonia states into Ds(D)eν¯e and Ds(D)μν¯μ.
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    Exploratory study of χc1(4140) and like states in QCD sum rules
    (Elsevier, 2019-05) Türkan, Arzu; Dağ, Hüseyin; Natural and Mathematical Sciences; TÜRKAN, Arzu; DAĞ, Hüseyin
    In this work, we chose three molecular and three diquark-antidiquark currents with the quark content c (c) over bars (s) over bar and J(PC) = 0(++), 1(++), 2(++), and estimated the masses and the meson coupling constants of the ground states coupling to these currents in the framework of QCD sum rules. In operator product expansion, we considered the terms including dimension eight, and we performed pole contribution tests carefully. According to our results, all of these currents couple to the ground states with degenerate masses which are in 10 MeV vicinity of chi(c1) (4140). Therefore, with a QCD sum rules analysis, it is not possible to conclude that chi(c1) (4140) has a dominant molecular or diquark-antidiquark content. However, there may be three states degenerate in mass, with positive charge conjugation and different isospins.
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    The semileptonic B to K1(1270, 1400) decays in QCD sum rules
    (IOP Publishing, 2011) Dağ, Hüseyin; Özpineci, A.; Zeyrek, H. T.; Natural and Mathematical Sciences; DAĞ, Hüseyin
    We analyze the semileptonic rare decays of the B meson to K1(1270) and K1(1400) axial vector mesons. The B → K1(1270, 1400)_+_− decays are significant flavor-changing neutral current decays of the B meson. These decays are sensitive to the new physics beyond the standard model (SM), since these processes are forbidden at tree level at SM. These decays occurring at the quark level via b → s_+_− transition also provide new opportunities for calculating the CKM matrix elements Vbt and Vts. In this study, the transition form factors of the B → K1(1270, 1400)_+_− decays are calculated using the three-point QCD sum rules approach. The resulting form factors are used to estimate the branching fractions of these decays.
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    ArticlePublicationOpen Access
    Light D-wave axial-tensor K2(1820) meson at finite temperature
    (IOP Publishing, 2019-06) Türkan, Arzu; Dağ, Hüseyin; Süngü, J. Y.; Veliev, V.; Natural and Mathematical Sciences; TÜRKAN, Arzu; DAĞ, Hüseyin
    In this work the properties of the axial-tensor K-2(1820) meson in a hot medium are investigated. The mass and the decay constant of this state are calculated via thermal QCD sum rules considering QCD condensates up to dimension five. Our analysis show that both mass and decay constant stay almost monotonous up to certain temperatures and then they diminish with increasing temperature. The mass and decay constant estimated at zero temperature are in good agreement with the present experimental data and theoretical estimations.
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    Investigation of the excited states in hidden charm hidden strange sector
    (2018) Dağ, Hüseyin; Türkan, Arzu; Natural and Mathematical Sciences; TÜRKAN, Arzu; DAĞ, Hüseyin
    In this work, we studied the radial excitations of X(4140) and like states within QCD sum rules. We chose three molecular and three diquark-antidiquark currents with the quark content cc‾ss‾ and JPC = 0++, 1++, 2++, and estimated the masses and the meson coupling constants of the first excited states coupling to these currents in the framework of QCD sum rules. The ground states coupling to these currents were analyzed in a previous work and we have shown that all of these ground states have degenerate masses within 10 MeV neighborhood of exotic meson X(4140). For the excited states, the masses are not found to be degenerate. We found that scalar and tensor currents are coupling to Ds ⁎D‾s ⁎ threshold. However for the axial vector currents, the first excited states found to have mass compatible with X(4274), which was measured in the same decay with X(4140). Thus we conclude that X(4274) could be a radial excitation of X(4140).
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    ArticlePublicationOpen Access
    B → T transition form factors in light-cone sum rules
    (American Physical Society, 2019-11-11) Aliev, T. M.; Dağ, Hüseyin; Kokulu, A.; Ozpineci, A.; Natural and Mathematical Sciences; DAĞ, Hüseyin
    We present a new calculation of the semileptonic tree-level and flavor-changing neutral current form factors describing B-meson transitions to tensor mesons T ¼ D2, K2, a2, f2 (JP ¼ 2þ). We employ the QCD light-cone sum rules approach with B-meson distribution amplitudes. We go beyond the leading-twist accuracy and provide analytically, for the first time, higher-twist corrections for the two-particle contributions up to twist-four terms. We observe that the impact of higher-twist terms to the sum rules is noticeable. We study the phenomenological implications of our results on the radiative B → K 2γ and semileptonic B → D 2lν¯l, B → K 2lþl− decays.
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    Conference ObjectPublicationOpen Access
    Analysis of X(4140) like states and their radial excitations in QCD
    (Sissa Medialab Srl, 2017) Türkan, Arzu; Dağ, Hüseyin; Natural and Mathematical Sciences; TÜRKAN, Arzu; DAĞ, Hüseyin
    In this work, we investigated the X(4140) and like states and their radial excitations by using molecular and diquark-antidiquark currents which couple to scalar, axial vector and tensor states via QCD sum rules. In operator product expansion, we considered quark, gluon and mixed vacuum condansates up to dimension eight. For the ground states coupling to these currents, we found that masses are almost degenerate with X(4140). For the excited states, we found that scalar and tensor currents are coupling to D∗ sD∗ s threshold. However for the axial vector currents, the mass of the first excited state is compatible with X(4274). Thus we conclude that, X(4274) might be the first radial excitation of X(4140).