Olgun Alpyagil, Asiye Tuğba

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A. Tugba Alpyagil
Asiye T. Alpyagil
Alpyagil, Tugba
Alpyagil, Olgun
Alpyagil, T.
A.,Olgun Alpyagil
Asiye Tuğba Olgun ALPYAGIL
A. T. ALPYAGiL
ALPYAGiL Asiye Tugba Olgun
Asiye Tuğba Olgun Alpyagil
ALPYAGIL Asiye Tuğba Olgun
Asiye Tugba Olgun ALPYAGiL
Alpyagil Asiye Tugba Olgun
Alpyagil, Tuğba
A. Tuğba Alpyagil
Alpyagil, Asiye
Alpyagil, A.
Olgun Alpyagil, Asiye Tuğba
Asiye Tuğba, Olgun Alpyagil
A. T. ALPYAGIL
Asiye Tugba Olgun Alpyagil
Alpyagil Asiye Tuğba Olgun
Alpyagil, O.
A. T. Alpyagil
A. T. Olgun Alpyagil
Olgun, A. T.
Olgun, A. T.
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Dr.Öğr.Üyesi
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tugba.olgun@okan.edu.tr
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5

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5

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0

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2015 - 201922020 - 20211
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Now showing 1 - 3 of 3
  • Thumbnail Image
    Article
    Citation Count: 7
    Effects of vector leptoquarks on Λb → Λcl(v)over-barl decay
    (Iop Publishing Ltd, 2021) Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Mobil Teknolojileri / Mobile Technologies; Uçak Teknolojisi / Aircraft Technology
    Experimental data on, R(D-(*()), R(K-(*()), and R(J/psi),, provided by different collaborations, show sizable deviations from the standard model predictions. To describe these anomalies, many new physics scenarios have been proposed. One of them is the leptoquark model, which introduces the simultaneous coupling of vector and scalar leptoquarks to quarks and leptons. To look for similar possible anomalies in the baryonic sector, we investigate the effects of a vector leptoquark U-3(3, 3, 2/3) on various physical quantities related to the tree-level Lambda b -> Lambda(c)l (v) over bar (l) decays (l = mu, tau), which proceed via b -> cl (v) over bar (l) transitions at the quark level. We calculate the differential branching ratio, forward-backward asymmetry, and longitudinal polarizations of leptons and Lambda(c) baryons at the mu and tau lepton channels in the leptoquark model and compare their behavior to the predictions of the SM in terms of q(2). In the calculations, we use the form factors calculated in full QCD as the main input and account for all errors coming from the form factors and model parameters. We observe that at the tau channel, the R-A fit solution to data related to the leptoquark model sweeps some regions out of the SM band; nevertheless, the fit has a considerable intersection with the SM predictions. The R-B type solution gives roughly the same results as the SM on DBR(q(2)) - q(2). At the mu channel, the leptoquark model gives results that are consistent with the SM predictions and existing experimental data on the behavior of DBR(q(2)) with respect to q(2). Concerning the q(2) behavior of the AFB(q(2)), the two types of fits for and the predictions at the mu channel in the leptoquark model give exactly the same results as the SM. We also investigate the behavior of the parameter R(q(2)) with respect to q(2) and the value of R(Lambda(c)) in both the vector leptoquark and SM models. Both fit solutions lead to results that deviate considerably from the SM predictions for R(q(2)) - q(2) and R(Lambda(c)). Future experimental data on R(q(2)) - q(2) and R(Lambda(c)), made available by measurements of the Lambda(b) -> Lambda(c)tau(nu) over bar tau channel, will be particularly helpful. Any experimental deviations from the SM predictions in this channel would emphasize the importance of tree-level hadronic weak transitions as good probes of new physics effects beyond the SM.
  • Thumbnail Image
    Article
    Citation Count: 4
    Impact of Scalar Leptoquarks on Heavy Baryonic Decays
    (Hindawi Ltd, 2017) Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Mobil Teknolojileri / Mobile Technologies; Uçak Teknolojisi / Aircraft Technology
    We present a study on the impact of scalar leptoquarks on the semileptonic decays of Lambda(b) , Sigma(b) , and Xi(b) . To this end, we calculate the differential branching ratio and lepton forward-backward asymmetry defining the processes Lambda(b) -> Lambda l(+) l(-) , Sigma(b) -> Sigma(b)l(+) l(-) and Xi(b) -> Xi l(+),l(-) , with l being mu or tau, using the form factors calculated via light cone QCD in full theory. In calculations, the errors of form factors are taken into account. We compare the results obtained in leptoquark model with those of the standard model as well as the existing lattice QCD predictions and experimental data.
  • Thumbnail Image
    Article
    Citation Count: 7
    Comparative analysis of the Λb → Λl+l- decay in the SM, SUSY, and RS model with custodial protection
    (Amer Physical Soc, 2015) Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Mobil Teknolojileri / Mobile Technologies; Uçak Teknolojisi / Aircraft Technology
    We comparatively analyze the rare Lambda(b) -> Lambda l(+)l(-) channel in the standard model, supersymmetry, and Randall-Sundrum model with custodial protection (RSc). Using the parametrization of the matrix elements entering the low-energy effective Hamiltonian in terms of form factors, we calculate the corresponding differential decay width and lepton forward-backward asymmetry in these models. We compare the results obtained with the most recent data from LHCb as well as lattice QCD results on the considered quantities. It is obtained that the standard model, with the form factors calculated in light-cone QCD sum rules, cannot reproduce some experimental data on the physical quantities under consideration, but the supersymmetry model can do it. The RSc model predictions are roughly the same as the standard model, and there are no considerable differences between the predictions of these two models. In the case of differential decay rate, the data in the range 4 GeV(2/)c(4) <= q(2) <= 6 GeV2/c(4) cannot be described by any of the considered models.