# A. Özpineci's research while affiliated with Abdus Salam International Centre for Theoretical Physics and other places

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## Publications (41)

The 4th International Conference on Hadron Physics, TROIA'14, was held at Canakkale, Turkey on 1-5 July 2014. Ozyegin University, Middle East Technical University, Canakkale Onsekiz Mart University, Turkish Atomic Energy Authority and HadronPhysics2 Consortium sponsored the conference. It aimed at bringing together the experts and the young scienti...

New relations between QCD Borel sum rules for masses of Σ0 and Λ hyperons are constructed. It is shown that starting from the sum rule for the Σ0 hyperon mass it is straightforward to obtain the corresponding sum rule for the Λ hyperon mass and vice versa.

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 ≃ −(39 ± 4)°.

The 3rd International Conference on Hadron Physics, TROIA'11 was held at Canakkale, Turkey on 22–25 August 2011. Ozyegin University, Middle East Technical University, Canakkale Onsekiz Mart University and HadronPhysics2 Consortium sponsored the conference. Its aim was to bring together the experts and young scientists working on experimental and th...

We analyze the semileptonic rare decays of the B meson to K1(1270) and K1(1400) axial vector mesons. The B → K1(1270, 1400)ℓ+ℓ− 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 dec...

The magnetic and quadrupole moments of the light-vector and axial-vector
mesons are calculated in the light cone QCD sum rules. Our results for the
static properties of these mesons are compared with the predictions of lattice
QCD as well as other approaches existing in the literature.

Using the most general form of the interpolating current of the baryons, the strong coupling constants of the light vector mesons with the octet baryons are calculated within the light cone QCD sum rules. The SU(3){sub f} symmetry breaking effects are taken into account in the calculations. It is shown that each of the electric and magnetic couplin...

New relations between Borel QCD sum rules for the strong couplings of baryons to kaons are derived. It is shown that, on the
basis of the sum rules for the coupling constants g
πΣΣ and g
πΣΛ, the corresponding sum rules can be directly obtained for the coupling constants g
KYN
and g
KYΞ, Y = Σ,Λ. The values of these coupling constants are calculat...

New relations between QCD Borel sum rules for strong coupling constants of mesons to baryons are derived. It is shown that starting from the sum rule for the coupling constants gpiSigmaSigma and gpiSigmaLambda it is straightforward to obtain corresponding sum rules for the gKYN, gKYXi couplings, Y = Sigma, Lambda.

New relations between the Borel QCD sum rules for the strong couplings of the Σ0 and Λ hyperons are derived. It is shown that, using the sum rules for g
MΣΣ, M = π
0, η, as a starting point, one can readily obtain the corresponding sum rules for the coupling constants g
ηΛΛ and g
πΛΣ
0. The values of these constants are calculated in a specific...

It is shown that starting from the QCD Borel sum rule for mu {∑ 0 } and applying to it the transformations (u s) and (d s) it is straightforward to obtain the corresponding sum rule for the muLambda as well as the sum rule for mu {Lambda ∑ 0 }.

New relations between the Borel sum rules in QCD for the magnetic moments of the {sigma}{sup 0} and {lambda} hyperons are derived. It is shown that, on the basis of the sum rule for the magnetic moment of the {sigma}{sup 0} hyperon, one can directly obtain the corresponding sum rule for the magnetic moment of the {lambda} hyperon, and vice versa, a...

New relations between QCD Borel sum rules for masses of
Σ0 and Λ hyperons are constructed. It is shown
that starting from the sum rule for the Σ0 hyperon mass
it is straightforward to obtain the corresponding sum rule for the
Λ hyperon mass and vice versa.

We calculate the form factors V, A
1, A
2 and A
0 appearing in the
$D_s \rightarrow \phi$
transition by the light cone QCD sum rule method. We compare our results on these form factors with the current experimental results and existing theoretical calculations.

We study the effects of sequential fourth quark generation in rare B rightarrow K(K^*) ell^+ ell^- decays induced by the b rightarrow s transition and in B s 0- bar{B}_s^0 mixing. Using the experimental values on the branching ratios of the B rightarrow X_s gamma and B rightarrow K(K^*) ell^+ ell^- decays, the allowed regions for left\vert V_{tb} V...

We study the semileptonic decay B→ηlν. The transition form
factors for this decay are calculated by using light cone QCD sum rules.
The branching ratio is estimated to be
B(B→ην)=(1.6±0.8)×10-5.

The contribution of the fourth generation quarks to the rare
$B_s \rightarrow \ell^+ \ell^-$
and
$B_s \rightarrow \ell^+ \ell^- \gamma$
decays are studied. Constraints on the extended Cabibbo-Kobayashi-Maskawa matrix elements |V
tb
V
ts
*| and
$\vert V_{t^\prime b} V_{t^\prime s}^* \vert$
are obtained from the existing experimental result for th...

DOI:https://doi.org/10.1103/PhysRevD.67.039901

We present a model independent analysis of Λ baryon polarizations
in the Λb→Λl+l-
decay. The sensitivity of the averaged Λ polarizations to the new
Wilson coefficients is studied. It is observed that there exist certain
regions of the new Wilson coefficients where the branching ratio
coincides with the standard model prediction, while the Λ baryon...

Using the most general, model independent form of the effective
Hamiltonian, the exclusive rare baryonic Λb→
Λℓ +ℓ -(ℓ= μ, τ) decay
is analyzed. We study the sensitivity of the branching ratio and lepton
forward-backward asymmetry to the new Wilson coefficients. It is shown
that these physical quantities are quite sensitive to the new Wilson
coeffi...

T-odd correlations as physical observables in the
B→K*l+l- decay are studied using
the most general form of the effective Hamiltonian. It is observed that
these quantities are very sensitive to the new physics. We estimate the
potential of discovery of these quantities at future hadron colliders.

Using the most general, model independent form of effective Hamiltonian, the transverse polarization PT of Λ in Λb→Λℓ+ℓ− decay is studied. It is observed that the averaged is very sensitive to the existence of new physics and can attain large values, which can be measured at future colliders.

Using the general form of Sigma(Q) and Lambda(Q) (Q=b or c) currents, Sigma(Q)Lambda(Q) transition magnetic moments are calculated in the framework of the light cone QCD sum rules method. In this approach nonperturbative effects are described by the photon wave functions and only two-particle photon wave functions are taken into account. Our predic...

The coupling constant gρσγ is determined from light cone QCD sum rules. A comparison of our result with the ones existing in the literature is presented.

The light cone QCD sum rules method is used to calculate the transition
form factor for the radiative φ-->f0γ decay,
assuming that the quark content of the f0 meson is pure
/s¯s state. The branching ratio is estimated to be
B(φ-->f0γ)=3.5×(1+/-0.3)×10-
4. A comparison of our prediction on branching ratio with the
theoretical results and experimenta...

Using the general, model-independent form of effective Hamiltonian, the
decay spectrum of B0→
π+π-ℓ +ℓ -
decay is studied. The sensitivity of experimentally measurable
asymmetries to the new Wilson coefficients and time is studied. It is
observed that different asymmetries are sensitive to the new Wilson
coefficients and they can serve as an effici...

Using the most general, model independent form of the effective Hamiltonian rare decays B→ℓ+ℓ−γ (ℓ=μ,τ) are studied. The sensitivity of the photon energy distribution and branching ratio to the new Wilson coefficients is investigated.

Using the general, model independent form of the effective Hamiltonian,
the general expressions of the longitudinal, normal, and transversal
polarization asymmetries for l- and l+ and
combinations of them for the exclusive
B-->Kl+l- decay are found. The sensitivity of
lepton polarizations and their combinations on new Wilson coefficients
are studie...

Using the general form of the Σ0 and Λ currents, the Σ0Λ transition magnetic moment is calculated in framework of the light cone QCD sum rules. A comparison of our result on this quantity with the existing theoretical results and experimental data is presented.

Using the most general, model independent effective Hamiltonian, the branching ratio of the B→K∗ℓ+ℓ− decay, when K∗ meson is longitudinally or transversally polarized, is presented. The dependence of the branching ratio on the new Wilson coefficients, when K∗ meson is polarized, is studied. It is observed that the branching ratio is very sensitive...

Using the most general, model-independent form of effective Hamiltonian, the exclusive, rare decay is analyzed. The sensitivity of the branching ratio and missing mass-squared spectrum of the decay, when K∗ is polarized longitudinally or transversally, on the new Wilson coefficients is discussed.

We calculate the magnetic moments of Δ baryons within the framework of QCD sum rules. A comparison of our results on the magnetic moments of the Δ baryons with the predictions of different approaches is presented.

Influence of the fourth generation, if ever exists, on the experimentally measurable quantities such as invariant dilepton mass distribution, lepton forward–backward asymmetry, and the ratio of the decay widths when K∗ meson is longitudinally and transversally polarized, is studied. Using the experimental results on the branching ratios for the and...

The form factors of B1→π and D1→π transitions, where B1(D1) is the 1+ P-wave meson state, are calculated in the framework of the light cone QCD. Furthermore, these form factors are compared with the pole dominance model prediction using the values of the strong coupling constants and , and a good agreement between these two different descriptions i...

We investigate the transition form factors for the BâK{sup *}l{sup +}lâ» (l=Î¼,Ï) decay in light cone QCD. It is found that the light cone and three-point QCD sum rule analyses for some of the form factors for the decay BâK{sup *}l{sup +}lâ» lead to absolutely different qÂ² dependence. The invariant dilepton mass distributions for the BâK{sup *}Î...

We investigate the transition form factors for the B→K*l+l- (l = μ, τ) decay in light cone QCD. It is found that the light cone and three-point QCD sum rule analyses for some of the form factors for the decay B→K*l+l- lead to absolutely different q2 dependence. The invariant dilepton mass distributions for the B→K*μ+μ- and B→K*τ+τ- decays and final...

The radiative dileptonic decays Bs(Bd)→l+l-γ (l=e,μ) are investigated within the standard model. The transition form factors are calculated in the framework of the light cone QCD sum rule method and it is found that the branching ratios are B(Bs→e+e-γ)=2.35×10 -9, B(Bs→μ+μ-γ)=1.9×10 -9, B(Bd→e+e-γ)=1.5×10 -10, and B(Bd→μ+μ-γ)=1.2×10 -10. A comparis...

The radiative dileptonic decays Bs(Bd)→l+l-γ (l=e,μ) are investigated within the standard model. The transition form factors are calculated in the framework of the light cone QCD sum rule method and it is found that the branching ratios are B(Bs→e+e-γ)=2.35×10-9, B(Bs→μ+μ-γ)=1.9×10-9, B(Bd→e+e-γ)=1.5×10-10, and B(Bd→μ+μ-γ)=1.2×10-10. A comparison o...

The decay width, forward-backward asymmetry and lepton longitudinal and transversal polarization for the exclusive B → K∗ℓ+ℓ− decay in a two Higgs doublet model are computed. It is shown that all these quantities are very effective tools for establishing new physics.

Using the light cone QCD Sum Rules Method, we study the rare decay and find that the branching ratios are, , . A comparison of our results on branching ratio with constituent quark and pole dominance model predictions are presented.

We calculate the transition formfactors for the B -> Kl+
l- decay in the framework of the light cone QCD sum rules.
The invariant dilepton mass distribution and the final lepton
longitudinal polarization asymmetry are investigated. The comparison
analysis of our results with traditional sum rules method predictions on
the formfactors is performed.

## Citations

... By using the same correlator and keeping only the first term of the b-quark propagator (9), Ref. [11] calculated the LCSRs for the B → ρ TFFs A 1 , A 2 and V , and Ref. [23] calculated the LCSRs for the B → K * TFFs A 1 , ...

... In the past, theoretical analyses focused on a family of similar reactions, namely, the B → γl + l − and B → γlν decays (see, e.g., [16][17][18][19][20][21][22][23][24][25][26]); these processes are described by the same form factors as four-lepton B-decays, but evaluated at a zero value of one of the momenta squared. The corresponding form factors depend on one variable q ′2 , q ′ the momentum of the weak current; for instance, for radiative leptonic decays B → γl ′ ν ′ , one needs the form factors The four-lepton decay of interest, B → l + l − l ′ ν ′ , requires the form factors F i (q ′2 , q 2 ) for 0 < q 2 , q ′2 < M 2 B . ...

... Using the relation obtained in [28] which connected Λ and Σ 0 interpolating currents one can easily find the expression for the magnetic moment of Λ-hyperon: ...

... The expressions for differential decay rates and forward-backward asymmetry agree with the formulation of Ref. [102], and also reproduce the formulas of Refs. [103][104][105] for m s = 0 and m l = 0, while for m s = 0 and m l = 0 they reproduce the formulas of Ref. [106,107]. In the limit m s = 0, the expressions for lepton polarization asymmetries correspond to Refs. ...

... So these processes provided a unique platform to deepen our understanding on both quantum chromodynamics (QCD) and the dynamics of weak processes, and help to hunt for NP signs. Therefore, the rare decay of b → s attracted the attentions of both theorists and experimentalists [5][6][7][8][9][10][11]. ...

... In such cases, one may express the two-body production subamplitude P as a linear combination of elements of the two-body scattering amplitude T [5][6][7][8]. The latter quantities, which contain the full two-body dynamics, are then supposed to be known, either from experiment [9][10][11][12][13][14][15][16][17][18][19], or from theoretical considerations [20][21][22][23][24][25][26]. ...

... We will also examine the longitudinal, transverse, and normal components of the lepton polarization asymmetries (LPAs). It has been shown that for B meson decays that the LPAs are largely independent of the form factors in certain limits [6,11,12,[14][15][16][17]. We explore whether LPAs for the decays of the Λ b are also independent of the form factors in any kinematic regimes. ...

... Here C is the charge conjugation operator, A 1 1 = I, A 2 1 = A 1 2 = γ 5 , and A 2 2 = β where β is an arbitrary auxiliary parameter. It is shown in [14] that the current of Λ baryon can be obtained from the Σ 0 current with the help of following relations, ...

... In exclusive B → K, K * decays the long-distance effects in the meson transition amplitude of the effective Hamiltonian are encoded in the meson transition form factors which are the scalar functions of the square of momentum JHEP07(2013)006 transfer and are model dependent quantities. Many exclusive B meson processes based on b → s (d) + − such as B → K (K * ) + − [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], B → φ + − [22], B → γ + − [23][24][25][26][27][28] and B → + − [29][30][31][32][33][34][35] have been studied in literature. In these studies various fameworks have been applied to the description of meson transition form factors of initial and final state meson like constituent quark models, QCD sum rules, lattice QCD, etc. ...

... In the past several decades, significant theoretical efforts have been made to study the decays [6][7][8][9][10][11][12][13] and [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. In [6], the branching fraction was reported based on the experimental data [31]. ...