SCOAP3 Repository 15 records found  1 - 10nextSearch took 0.02 seconds. 
1. The unpolarized two-loop massive pure singlet Wilson coefficients for deep-inelastic scattering / Blümlein, J. ; De Freitas, A. ; Raab, C.G. ; Schönwald, K.
We calculate the massive two–loop pure singlet Wilson coefficients for heavy quark production in the unpolarized case analytically in the whole kinematic region and derive the threshold and asymptotic expansions. [...]
Published in Nuclear Physics B 945 (2019) 10.1016/j.nuclphysb.2019.114659
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2. The O ( α 2 ) initial state QED corrections to e + e − annihilation to a neutral vector boson revisited / Blümlein, J. ; De Freitas, A. ; Raab, C.G. ; Schönwald, K.
We calculate the non-singlet, the pure singlet contribution, and their interference term, at O(α2) due to electron-pair initial state radiation to e+e− annihilation into a neutral vector boson in a direct analytic computation without any approximation. [...]
Published in Physics letters B 791 (2019) 206-209 10.1016/j.physletb.2019.02.038
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3. Heavy quark form factors at two loops / Ablinger, J. ; Behring, A. ; Blümlein, J. ; Falcioni, G. ; et al
We compute the two-loop QCD corrections to the heavy quark form factors in the case of the vector, axial-vector, scalar and pseudoscalar currents up to second order in the dimensional parameter ϵ=(4D)/2. [...]
Published in Physical Review D 97 (2018) 10.1103/PhysRevD.97.094022 arXiv:1712.09889
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4. The variable flavor number scheme at next-to-leading order / Blümlein, J. ; De Freitas, A. ; Schneider, C. ; Schönwald, K.
We present the matching relations of the variable flavor number scheme at next-to-leading order, which are of importance to define heavy quark partonic distributions for the use at high energy colliders such as Tevatron and the LHC. [...]
Published in Physics letters B (2018) 10.1016/j.physletb.2018.05.054
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5. The two-mass contribution to the three-loop gluonic operator matrix element Agg,Q(3) / Ablinger, J. ; Blümlein, J. ; De Freitas, A. ; Goedicke, A. ; et al
We calculate the two-mass QCD contributions to the massive operator matrix element Agg,Q at O(αs3) in analytic form in Mellin N - and z -space, maintaining the complete dependence on the heavy quark mass ratio. [...]
Published in Nuclear Physics B (2018) 10.1016/j.nuclphysb.2018.04.023
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6. The two-mass contribution to the three-loop pure singlet operator matrix element / Ablinger, J. ; Blümlein, J. ; De Freitas, A. ; Schneider, C. ; et al
We present the two-mass QCD contributions to the pure singlet operator matrix element at three loop order in x -space. [...]
Published in Nuclear Physics B (2017) 10.1016/j.nuclphysb.2017.12.018
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7. The three-loop splitting functions Pqg(2) and Pgg(2,NF) / Ablinger, J. ; Behring, A. ; Blümlein, J. ; De Freitas, A. ; et al
We calculate the unpolarized twist-2 three-loop splitting functions Pqg(2)(x) and Pgg(2,NF)(x) and the associated anomalous dimensions using massive three-loop operator matrix elements. [...]
Published in Nuclear Physics B (2017) 10.1016/j.nuclphysb.2017.06.004
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8. Three loop massive operator matrix elements and asymptotic Wilson coefficients with two different masses / Ablinger, J. ; Blümlein, J. ; De Freitas, A. ; Hasselhuhn, A. ; et al
Starting at 3-loop order, the massive Wilson coefficients for deep-inelastic scattering and the massive operator matrix elements describing the variable flavor number scheme receive contributions of Feynman diagrams carrying quark lines with two different masses. [...]
Published in Nuclear Physics B (2017) 10.1016/j.nuclphysb.2017.05.017
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9. The complete O(αs2) non-singlet heavy flavor corrections to the structure functions g1,2ep(x,Q2) , F1,2,Lep(x,Q2) , F1,2,3ν(ν¯)(x,Q2) and the associated sum rules / Blümlein, Johannes ; Falcioni, Giulio ; De Freitas, Abilio
We calculate analytically the flavor non-singlet O(αs2) massive Wilson coefficients for the inclusive neutral current non-singlet structure functions F1,2,Lep(x,Q2) and g1,2ep(x,Q2) and charged current non-singlet structure functions F1,2,3ν(ν¯)p(x,Q2) , at general virtualities Q2 in the deep-inelastic region. [...]
Published in Nuclear Physics B (2016) 10.1016/j.nuclphysb.2016.06.018
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10. The 3-loop non-singlet heavy flavor contributions to the structure function g1(x,Q2) at large momentum transfer / Behring, A. ; Blümlein, J. ; De Freitas, A. ; von Manteuffel, A. ; et al
We calculate the massive flavor non-singlet Wilson coefficient for the heavy flavor contributions to the polarized structure function g1(x,Q2) in the asymptotic region Q2≫m2 to 3-loop order in Quantum Chromodynamics at general values of the Mellin variable N and the momentum fraction x , and derive heavy flavor corrections to the Bjorken sum-rule. [...]
Published in Nuclear Physics B 897 (2015) 612-644 10.1016/j.nuclphysb.2015.06.007
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