Natural and Mathematical Sciences
Permanent URI for this collectionhttps://hdl.handle.net/10679/313
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Browsing by Institution Author "ERKOL, Güray"
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ArticlePublication Unknown Charmed baryon spectrum from lattice QCD near the physical point(American Physical Society, 2020-09-23) Bahtiyar, H.; Can, K. U.; Erkol, Güray; Gubler, P.; Oka, M.; Takahashi, T. T.; TRJQCD Collaboration; Natural and Mathematical Sciences; ERKOL, GürayWe calculate the low-lying spectrum of charmed baryons in lattice QCD on the 32(3) x 64, N-f = 2 +/- 1 PACS-CS gauge configurations at the almost physical pion mass of similar to 156 MeV/c(2). By employing a set of interpolating operators with different Dirac structures and quark-field smearings for the variational analysis, we extract the ground and first few excited states of the spin-1/2 and spin-3/2, singly, doubly, and triply charmed baryons. Additionally, we study the Xi(c)-Xi(c)' mixing and the operator dependence of the excited states in a variational approach. We identify several states that lie close to the experimentally observed excited states of the Sigma(c), Xi(c) and Omega(c) baryons, including some of the Xi(c) states recently reported by LHCb. Our results for the doubly and triply charmed baryons are suggestive for future experiments.
ArticlePublication Unknown Electromagnetic properties of doubly charmed baryons in Lattice QCD(Elsevier, 2013-11-04) Can, K. Utku; Erkol, Güray; Işıldak, Bora; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, Güray; IŞILDAK, Bora; Can, K. UtkuWe compute the electromagnetic properties of Ξcc baryons in (2+1)-flavor Lattice QCD. By measuring the electric charge and magnetic form factors of Ξcc baryons, we extract the magnetic moments, charge and magnetic radii as well as the ΞccΞccρ coupling constant, which provide important information to understand the size, shape and couplings of the doubly charmed baryons. We find that the two heavy charm quarks drive the charge radii and the magnetic moment of Ξcc to smaller values as compared to those of, e.g., the proton.Conference ObjectPublication Metadata only Electromagnetic structure of charmed baryons(Proceedings of Science, 2013) Can, K. U.; Oka, M.; Erkol, Güray; Işıldak, Bora; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, Güray; IŞILDAK, BoraWe compute the electromagnetic form factors of charmed baryons (∑ c, (ξcc, ω c and ω cc) in 2+1 Lattice QCD and extract their electric and magnetic charge radii as well as their magnetic mo-ments. Such observables are important to understand the structure and the inner dynamics of the hadrons. We find that the existence of the heavy quarks drive the charge radii and magnetic moments to smaller values as compared to those of, e.g., proton.Conference ObjectPublication Metadata only Electromagnetic structure of charmed baryons - extended to spin-3/2(2015) Can, K. U.; Oka, M.; Erkol, Güray; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, GürayThe electromagnetic form factors of the spin-3/2 Ω baryons, namely the Ω, Ω∗c , Ω∗ cc and Ωccc, are calculated in full QCD on 323 x 64 PACS-CS lattices with a pION mass of 156(9) MeV. The electric charge radii and magnetic moments from the E0 and M1 multipole form factors are extracted. Results for the electric quadrupole form factor, E2, are also provided. Quark sector contributions are computed individually for each observable and then combined to obtain the baryon properties. Charm quark contributions are observed to be systematically smaller compared to the strange quark contributions in case of the charge radii and magnetic moments. E2 moments of the Ω∗ cc and Ωccc are estimated significantly enough to show that their electric charge distributions are deformed. Properties of the spin-1/2 counterparts of the Ω∗ cc and Ω∗ cc baryons are also computed and a comparison is presented.ArticlePublication Metadata only Electromagnetic structure of charmed baryons in Lattice QCD(Springer Science+Business Media, 2014-05) Can, Kadir Utku; Erkol, Güray; Işıldak, Bora; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, Güray; IŞILDAK, Bora; Can, Kadir UtkuAs a continuation of our recent work on the electromagnetic properties of the doubly charmed (sic)(cc) baryon, we compute the charge radii and the magnetic moments of the singly charmed Sigma(c), Omega(c) and the doubly charmed Omega(cc) baryons in 2+1 flavor Lattice QCD. In general, the charmed baryons are found to be compact as compared to the proton. The charm quark acts to decrease the size of the baryons to smaller values. We discuss the mechanism behind the dependence of the charge radii on the light valence- and sea-quark masses. The magnetic moments are found to be almost stable with respect to changing quark mass. We investigate the individual quark sector contributions to the charge radii and the magnetic moments. The magnetic moments of the singly charmed baryons are found to be dominantly determined by the light quark and the role of the charm quark is significantly enhanced for the doubly charmed baryons.Conference ObjectPublication Metadata only Electromagnetic structure of charmed hadrons(IOP Publishing, 2014) Erkol, Güray; Can, K. U.; Işıldak, Bora; Oka, M.; Ozpineci, A.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, Güray; IŞILDAK, BoraWe compute the electromagnetic structures of D and D* mesons, the singly charmed Σc, Ωc and the doubly charmed Ξcc, Ωcc baryons in 2+1 flavor Lattice QCD. We extract the charge radii and the magnetic moments of these hadrons. In general, charmed hadrons are found to be more compact as compared to light hadrons. The magnetic moments of the singly charmed baryons are found to be dominantly determined by the light quark and the role of the charm quark is significantly enhanced when it is doubly represented.Conference ObjectPublication Metadata only First lattice calculation of charmed hadrons' electromagnetic form factors(IOP Publishing, 2014) Can, K. Utku; Erkol, Güray; Işıldak, Bora; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, Güray; IŞILDAK, Bora; Can, K. UtkuElectromagnetic form factors of D and D* mesons and Ξcc, Σc, Ωc and Ωcc baryons are calculated in 2+1 flavor lattice QCD. As a by product of this calculation electric/magnetic charge radii and magnetic moments are extracted. Compared to the PDG values of the light- sector, i.e. pion and proton, charmed hadron results are systematically smaller.ArticlePublication Metadata only A look inside charmed-strange baryons from lattice QCD(American Physical Society, 2015-12-01) Can, K. U.; Erkol, Güray; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, GürayThe electromagnetic form factors of the spin-3/2 Ω baryons, namely Ω, Ω∗c, Ω∗cc and Ωccc, are calculated in full QCD on 323×64 PACS-CS lattices with a pion mass of 156(9) MeV. The electric charge radii and magnetic moments from the E0 and M1 multipole form factors are extracted. Results for the electric quadrupole form factors, E2, are also given. Quark sector contributions are computed individually for each observable and then combined to obtain the baryon properties. We find that the charm quark contributions are systematically smaller than the strange-quark contributions in the case of the charge radii and magnetic moments. E2 moments of the Ω∗cc and Ωccc provide a statistically significant data to conclude that their electric charge distributions are deformed to an oblate shape. Properties of the spin-1/2 Ωc and Ωcc baryons are also computed and a thorough comparison is given. This complete study gives valuable hints about the heavy-quark dynamics in charmed hadrons.ArticlePublication Open Access Radiative transitions of doubly charmed baryons in lattice QCD(American Physical Society, 2018-12-13) Bahtiyar, H.; Can, K. U.; Erkol, Güray; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, GürayWe evaluate the spin-3/2→spin-1/2 electromagnetic transitions of the doubly charmed baryons on 2+1 flavor, 323×64 PACS-CS lattices with a pion mass of 156(9) MeV/c2. A relativistic heavy quark action is employed to minimize the associated systematic errors on charm-quark observables. We extract the magnetic dipole, M1, and the electric quadrupole, E2, transition form factors. In order to make a reliable estimate of the M1 form factor, we carry out an analysis by including the effect of excited-state contributions. We find that the M1 transition is dominant and light degrees of freedom (u/d- or s-quark) play the leading role. E2 form factors, on the other hand, are found to be negligibly small, which in turn, have a minimal effect on the helicity and transition amplitudes. We predict the decay widths and lifetimes of Ξcc∗+,++ and Ωcc∗+ based on our results. Finite size effects on these ensembles are expected to be around 1%. Differences in kinematical and dynamical factors with respect to the Nγ→Δ transition are discussed and compared to nonlattice determinations while keeping possible systematic artifacts in mind. A comparison to Ωcγ→Ωc∗ transition and a discussion on systematic errors related to the choice of heavy quark action are also given. Results we present here are particularly suggestive for experimental facilities such as LHCb, PANDA, Belle II, and BESIII to search for further states.Conference ObjectPublication Metadata only Structure and dynamics of charmed baryons in lattice QCD(AIP, 2017) Erkol, Güray; Natural and Mathematical Sciences; ERKOL, GürayI report on the transition from factors of Ωcγ → Ωc ∗ and the preliminary results for Ξcγ → Ξ' c transitions in lattice QCD, which give access to the only decay modes of Ωc∗ and Ξ' c. The decay rates of Ωc ∗ and Ξ' c as extracted from lattice QCD are also given.Conference ObjectPublication Metadata only 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, HüseyinIn 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)°.ArticlePublication Open Access Vector and axial-vector couplings of D and D⁎ mesons in 2+1 flavor lattice QCD(Elsevier, 2013-02-12) Can, Kadir Utku; Erkol, Güray; Oka, M.; Ozpineci, A.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, Güray; Can, Kadir UtkuUsing the axial-vector coupling and the electromagnetic form factors of the D and D⁎ mesons in 2+1 flavor lattice QCD, we compute the D⁎Dπ , DDρ and D⁎D⁎ρ coupling constants, which play an important role in describing the charm hadron interactions in terms of meson-exchange models. We also extract the charge radii of D and D⁎ mesons and determine the contributions of the light and charm quarks separately.ArticlePublication Metadata only ΛcΣcπ coupling and Σc → Λcπ decay in lattice QCD(Elsevier, 2017-05-10) Can, K. U.; Erkol, Güray; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, GürayWe evaluate the Lambda(c)Sigma(c)pi coupling constant (G(Lambda c)Sigma(c)pi) and the width of the strong decay Sigma(c) -> Lambda(c)pi in 2 + 1flavor lattice QCD on four different ensembles with pion masses ranging from 700MeV to 300 MeV. We find G(Lambda c)Sigma(c)pi= 18.332(1.476)(stat.)(2.171)(syst.) and the decay width Gamma (Sigma(c) -> Lambda(c)pi) = 1.65(28)(stat.)(30)(syst.) MeVon the physical quark-mass point, which is in agreement with the recent experimental determination.ArticlePublication Metadata only Ξcγ→Ξc ′ transition in lattice QCD(Elsevier, 2017-09-10) Bahtiyar, H.; Can, K. U.; Erkol, Güray; Oka, M.; Takahashi, T. T.; Natural and Mathematical Sciences; ERKOL, GürayWe evaluate the electromagnetic Ξcγ→Ξc ′ transition on 2+1 flavor lattices corresponding to a pion mass of ∼156 MeV. We extract the magnetic Sachs and Pauli form factors which give the Ξc–Ξc ′ transition magnetic moment and the decay widths of Ξc ′ baryons. We did not find a signal for the magnetic form factor of the neutral transition Ξc 0γ→Ξc ′0, which is suppressed by the U-spin flavor symmetry. As a byproduct, we extract the magnetic form factors and the magnetic moments of Ξc and Ξc ′ baryons, which give an insight to the dynamics of u/d, s and c quarks having masses at different scales.ArticlePublication Metadata only Ωcγ → Ω∗ transition in lattice QCD(Elsevier, 2015-07-30) Bahtiyar, H.; Can, K. U.; Erkol, Güray; Oka, M.; Natural and Mathematical Sciences; ERKOL, GürayWe study the electromagnetic View the MathML sourceΩcγ→Ωc⁎ transition in 2+12+1 flavor lattice QCD, which gives access to the dominant decay mode of View the MathML sourceΩc⁎ baryon. The magnetic dipole and the electric quadrupole transition form factors are computed. The magnetic dipole form factor is found to be mainly determined by the strange quark and the electric quadrupole form factor to be negligibly small, in consistency with the quark model. We also evaluate the helicity amplitudes and the decay rate.