20180119 13:34 
[PUBDB201800697]
Report/Journal Article
Ablinger, J. ; Blümlein, J. ; De Freitas, A. ; et al
The twomass contribution to the threeloop pure singlet operator matrix element
[DESY17195; DOTH1732; arXiv:1711.06717]
ddc:530
We present the twomass QCD contributions to the pure singlet operator matrix element at three loop order in xspace. These terms are relevant for calculating the structure function $F_2(x,Q^2)$ at $O(\alpha_s^3)$ as well as for the matching relations in the variable flavor number scheme and the heavy quark distribution functions at the same order. [...]
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20180115 15:08 
[PUBDB201800650]
Journal Article/Report/Contribution to a conference proceedings
Ablinger, J. ; Behring, A. ; Blümlein, J. ; et al
Heavy quark form factors at two loops in perturbative QCD
[DESY17188, DOTH 17/31, TTK1736, NIKHEF 2017059]
ddc:530
We present the results for heavy quark form factors at twoloop order in perturbative QCD for different currents, namely vector, axialvector, scalar and pseudoscalar currents, up to second order in the dimensional regularization parameter. We outline the necessary computational details, ultraviolet renormalization and corresponding universal infrared structure..
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20180115 14:52 
[PUBDB201800649]
Journal Article/Report/Contribution to a conference proceedings
Blümlein, J. ; Phan, K. H. ; Riemann, T.
Scalar oneloop vertex integrals as meromorphic functions of spacetime dimension $d$
[KW 17002, DESY 17186, DOTH 17/29]
ddc:530
Representations are derived for the basic scalar oneloop vertex Feynman integrals as meromorphic functions of the spacetime dimension $d$ in terms of (generalized) hypergeometric functions $_2F_1$ and $F_1$. Values at asymptotic or exceptional kinematic points as well as expansions around the singular points at $d=4+2n$, $n$ nonnegative integers, may be derived from the representations easily. [...]
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20180115 08:33 
[PUBDB201800635]
Preprint/Report
Ablinger, J. ; Behring, A. ; Blümlein, J. ; et al
The Heavy Quark Form Factors at Two Loops
[DESY17102; DOTH 17/16; Nikhef 2017063; TTK1744; arXiv:1712.09889]
We compute the twoloop QCD corrections to the heavy quark form factors in case of the vector, axialvector, scalar and pseudoscalar currents up to second order in the dimensional parameter $\epsilon = (4D)/2$. These terms are required in the renormalization of the higher order corrections to these form factors..
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20180111 16:31 
[PUBDB201800554]
Report/Journal Article
Fuster, J. ; Irles, A. ; Melini, D. ; et al
Extracting the topquark running mass using $t\bar{t} + \hbox {1jet}$ events produced at the Large Hadron Collider
[HUEP1705; LAL17034; DESY17053; arXiv:1704.00540]
ddc:530
We present the calculation of the nexttoleading order QCD corrections for topquark pair production in association with an additional jet at hadron colliders, using the modified minimal subtraction scheme to renormalize the topquark mass. The results are compared to measurements at the Large Hadron Collider run I. [...]
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20180111 13:00 
[PUBDB201800474]
Report/Journal Article
Chetyrkin, K. G. ; Kuhn, J. H. ; Maier, A. ; et al
Addendum to “Charm and bottom quark masses: An update”
[DESY17152; FRPHENO2017018; IPPP1772; TTP17039; arXiv:1710.04249]
ddc:530
We update the experimental moments for the charm quark as computed in [J. H. [...]
OpenAccess: PRD96(2017)116007  PDF PDF (PDFA); PhysRevD.96.116007  PDF PDF (PDFA);
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20180111 10:21 
[PUBDB201800428]
Report/Journal Article
Ablinger, J. ; Blümlein, J. ; De Freitas, A. ; et al
Three Loop Massive Operator Matrix Elements and Asymptotic Wilson Coefficients with Two Different Masses
[DESY14019; DOTH1508; arXiv:1705.07030]
ddc:530
Starting at 3loop order, the massive Wilson coefficients for deepinelastic 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. In the case of the charm and bottom quarks, the usual decoupling of one heavy mass at a time no longer holds, since the ratio of the respective masses, $η = mc^{2}_{c}/mb^{2}_{b}∼$ 1/10 , is not small enough. [...]
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20180110 09:38 
[PUBDB201800306]
Journal Article
Hoffman, M.
On multiple zeta values of even arguments
ddc:510
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20171220 14:41 
[PUBDB201713874]
Journal Article
Alekhin, S. ; Blümlein, J. ; Moch, S.
Strange sea determination from collider data
ddc:530
We consider determinations of the strange sea in the nucleon based on QCD analyses of data collected at the LHC with focus on the recent highstatistics ATLAS measurement of the W$^±$ and Zboson production. We study the effect of different functional forms for parameterization of the parton distribution functions and the combination of various data sets in the analysis [...]
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20171220 14:21 
[PUBDB201713869]
Contribution to a conference proceedings
Marquard, P.
Fourloop mass and field renormalization in the onshell scheme and renormalons
13th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology), Meeting locationSt. Gilgen, Austria, 25 Sep 2017  29 Sep 20172017092520170929
34 pp. (2017) [10.3204/PUBDB201713869]
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