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Öğe Impact of finite density on spectroscopic parameters of decuplet baryons(Amer Physical Soc, 2016) Azizi, Kazem; Er, Nuray; Sundu, HayriyeThe decuplet baryons, Delta. Sigma*, Xi*, and Omega(-), are studied in nuclear matter by using the in-medium QCD sum rules. By fixing the three-momentum of the particles under consideration at the rest frame of the medium, the negative energy contributions are removed. It is obtained that the parameters of the Delta baryon are more affected by the medium against the Omega-state, containing three strange quarks, whose mass and residue are not considerably affected by the medium. We also find the vector and scalar self-energies of these baryons in nuclear matter. By the recent progresses at the PANDA experiment at the FAIR and NICA facility, it may be possible to study the in-medium properties of such states, even the multistrange. Xi* and Omega-systems, in the near future.Öğe In-medium properties of B and D mesons(E D P Sciences, 2014) Sundu, Hayriye; Azizi, Kazem; Er, NurayThe shifts in the masses and decay constants of B and D mesons in nuclear medium are calculated in the frame work of QCD sum rules. The results obtained are compared with the existing theoretical predictions.Öğe More about the B and D mesons in nuclear matter(Springer, 2014) Azizi, Kazem; Er, Nuray; Sundu, HayriyeWe calculate the shifts in decay constants of the pseudoscalar B and D mesons in nuclear medium in the frame work of QCD sum rules. We write those shifts in terms of the B-N and D-N scattering lengths and an extra phenomenological parameter entered to calculations. Computing an appreciate forward scattering correlation function, we derive the QCD sum rules for the B-N and D-N scattering lengths and the extra phenomenological parameter in terms of various operators in nuclear medium. We numerically find the values of the shifts in the decay constants compared to their vacuum values. Using the sum rules obtained, we also determine the shifts in the masses of these particles due to nuclear matter and compare the results obtained with the previous predictions in the literature.Öğe Positive and negative parity hyperons in nuclear medium(Amer Physical Soc, 2015) Azizi, Kazem; Er, Nuray; Sundu, HayriyeThe effects of the nuclear medium on the residue, mass, and self-energy of the positive-and negative-parity Sigma, Lambda, and Xi hyperons are investigated using the QCD sum-rule method. In the calculations, the general interpolating currents of hyperons with an arbitrary mixing parameter are used. We compare the results obtained in medium with those of the vacuum and calculate the shifts in the corresponding parameters. It is found that the shifts on the residues in nuclear matter are overall positive for both the positive- and negative-parity hyperons, except for the positive-parity Sigma hyperon which has a negative shift. The shifts on the masses of these baryons are found to be negative. The shifts on the residues and masses of negative-parity states are large compared to those of positive-parity states. The maximum shift belongs to the residue of the negative-parity Lambda hyperon. The vector self-energies gained by the positive-parity baryons are large compared to the vector self-energies of the negative-parity particles. The maximum value of the vector self-energy belongs to the positive-parity Sigma hyperon. The numerical values are compared with the existing predictions in the literature.Öğe Scalar and vector self-energies of heavy baryons in nuclear medium(Elsevier Science Bv, 2017) Azizi, Kazem; Er, Nuray; Sundu, HayriyeThe in-medium sum rules are employed to calculate the shifts in the mass and residue as well as the scalar and vector self-energies of the heavy Lambda(Q), Sigma(Q) and Xi(Q) baryons, with Q being b or c quark. The maximum shift in mass due to nuclear matter belongs to the Sigma(c) baryon and it is found to be Delta m Sigma(c) = -936 MeV. In the case of residue, it is obtained that the residue of Sigma(b) baryon is maximally affected by the nuclear medium with the shift Delta lambda Sigma(b) = -0.014 GeV3. The scalar and vector self-energies are found to be Sigma(S)(Lambda b)= 653 MeV, Sigma(S)(Lambda b) = -614 MeV, Sigma(S)(Xi b) = -17 MeV, Sigma(S)(Lambda c)., = 272 MeV, Sigma(S)(Sigma c) = -936 MeV, Sigma(S)(Xi c) = -5 MeV and Sigma(nu)(Lambda c) = 436 +/- 148 MeV, Sigma(nu)(Sigma c) = 382 +/- 129 MeV, Sigma(nu)(Xi c) =15 +/- 5 MeV, Sigma(nu)(Lambda c) =151 +/- 45 MeV, Sigma(nu)(Sigma c)= 486 +/- 144 MeV and Sigma(nu)(Xi c) = 1.391 +/- 0.529 MeV. (C) 2017 The Author(s). Pcublished by Elsevier B.V.Öğe Scalar and vector self-energies of heavy baryons in nuclear medium (vol 960, pg 147, 2017)(Elsevier Science Bv, 2017) Azizi, Kazem; Er, Nuray; Sundu, HayriyeIn this erratum, we correct some misprints in equation (13) of our paper Nucl. Phys. A 960 (2017) 147–164. The corrected form of this equation is: As they are only misprints and their correct forms have been taken into account in numerical calculations, these corrections do not affect the numerical values of the parameters discussed in the paper.Öğe Semileptonic B -> (D)over-bar transition in a nuclear medium(American Physical Society, 2015) Azizi, Kazem; Er, Nuray; Sundu, HayriyeWe study the semileptonic tree-level B -> (D) over bar transition in the framework of QCD sum rules in a nuclear medium. In particular, we calculate the in-medium form factors entering the transition matrix elements defining this decay channel. It is found that the interactions of the participating particles with the medium lead to a considerable suppression in the branching ratio compared to the vacuum.
