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S. A. Larin

Bio: S. A. Larin is an academic researcher. The author has contributed to research in topics: Anomaly (physics) & Renormalization. The author has an hindex of 2, co-authored 3 publications receiving 641 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the prescription for the γ5 matrix within dimensional regularization in multiloop calculations is elaborated and the three-loop anomalous dimension of the singlet axial current is calculated.

411 citations

01 Jan 1992
TL;DR: In this article, the prescription for the γ5 matrix within dimensional regularization in multiloop calculations is elaborated and the three-loop anomalous dimension of the singlet axial current is calculated.
Abstract: The prescription for the γ5 matrix within dimensional regularization in multiloop calculations is elaborated. The three-loop anomalous dimension of the singlet axial current is calculated.

257 citations

Journal ArticleDOI
TL;DR: In this article, the prescription for the γ-gamma-5-matrix within dimensional regularization in multiloop calculations is elaborated, and the three-loop anomalous dimension of the singlet axial current is calculated.
Abstract: The prescription for the $\gamma_5$-matrix within dimensional regularization in multiloop calculations is elaborated. The three-loop anomalous dimension of the singlet axial current is calculated.

45 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors presented the QCD corrections to the fusion cross sections for the Higgs boson in the Standard Model, and for the neutral Higgs particles in the minimal supersymmetric extension of the standard model.

1,026 citations

Journal ArticleDOI
TL;DR: In this article, the authors present the NLO corrections to the total cross section for Higgs boson production using an alternative method than those used in previous calculations, and investigate the dependence of the cross section on several parton density sets provided by different groups.

565 citations

Journal ArticleDOI
TL;DR: In this paper, the axion potential, its mass and its coupling to photons were reconstructed with percent precision using first-principle QCD computations with uncertainties smaller than ten percent.
Abstract: We show how several properties of the QCD axion can be extracted at high precision using only first principle QCD computations. By combining NLO results obtained in chiral perturbation theory with recent Lattice QCD results the full axion potential, its mass and the coupling to photons can be reconstructed with percent precision. Axion couplings to nucleons can also be derived reliably, with uncertainties smaller than ten percent. The approach presented here allows the precision to be further improved as uncertainties on the light quark masses and the effective theory couplings are reduced. We also compute the finite temperature dependence of the axion potential and its mass up to the crossover region. For higher temperature we point out the unreliability of the conventional instanton approach and study its impact on the computation of the axion relic abundance.

557 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented the results for the two-loop matching conditions of the Wilson coefficients, the three-loop anomalous dimensions, and the twoloop matrix elements of the relevant operators entering the NNLO renormalization group analysis of the Z-penguin and the electroweak box contribution.
Abstract: We calculate the complete next-to-next-to-leading (NNLO) order QCD corrections to the charm contribution of the rare decay K+??+?. We present the results for the two-loop matching conditions of the Wilson coefficients, the three-loop anomalous dimensions, and the two-loop matrix elements of the relevant operators entering the NNLO renormalization group analysis of the Z-penguin and the electroweak box contribution. The NNLO QCD corrections reduce the theoretical uncertainty from ?9.8% at NLO to ?2.4% in the relevant parameter Pc(X), implying the leftover scale uncertainties in (K+??+?) and in the determination of |Vtd|, sin 2?, and ? from the K??? system to be ?1.3%, ?1.0%, ?0.006, and ?1.2?, respectively. For the charm quark mass mc(mc) = (1.30?0.05)GeV and |Vus| = 0.2248 the NLO value Pc(X) = 0.37?0.06 is modified to Pc(X) = 0.38?0.04 at NNLO and the error is fully dominated by the uncertainty in mc(mc). We tabulate Pc(X) in terms of mc(mc) and ?s(MZ) and express the dependences of Pc(X) on these and other parameters by an accurate approximate analytic formula. We find (K+??+?) = (8.0?1.1) ? 10?11 and the quoted uncertainty mainly stems from mc(mc) and the Cabibbo-Kobayashi-Maskawa elements. We also emphasize that improved calculations of the long-distance contributions to K+??+? and of the isospin breaking in the weak current matrix element will further sharpen the sensitivity of the two golden K??? decays to new physics.

490 citations

Journal ArticleDOI
TL;DR: In this article, the authors present the NLO corrections to the total cross section for Higgs boson production using an alternative method than those used in previous calculations, which is carried out in the effective Lagrangian approach which emerges from the standard model by taking the limit $m_t \to \infty$ where m_t denotes the mass of the top quark.
Abstract: We present the next-to-next-to-leading order (NNLO) corrections to the total cross section for (pseudo-) scalar Higgs boson production using an alternative method than those used in previous calculations. All QCD partonic subprocesses have been included and the computation is carried out in the effective Lagrangian approach which emerges from the standard model by taking the limit $m_t \to \infty$ where $m_t$ denotes the mass of the top quark. Our results agree with those published earlier in the literature. We estimate the theoretical uncertainties by comparing the $K$-factors and the variation with respect to the mass factorization/renormalization scales with the results obtained by lower order calculations. We also investigate the dependence of the cross section on several parton density sets provided by different groups. Further we study which part of the coefficient functions dominates the cross section. This is of interest for the resummation of large corrections which occur near the boundary of phase space. It turns out that depending on the definition of the total cross section the latter is dominated by the the soft-plus-virtual gluon corrections represented by $\delta(1-x)$ and $(\ln^i(1-x)/(1-x))_+$ terms. PACS numbers: 12.38.-t, 12.38.Bx, 13.85.-t, 14.80.Gt.

471 citations