# ZEU-THEO

 2018-01-1913:34 [PUBDB-2018-00697] Report/Journal Article et al The two-mass contribution to the three-loop pure singlet operator matrix element [DESY-17-195; DO-TH-17-32; arXiv:1711.06717] Nuclear physics / B 927, 339 - 367 (2018) [10.1016/j.nuclphysb.2017.12.018]   We present the two-mass QCD contributions to the pure singlet operator matrix element at three loop order in x-space. 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. [...] OpenAccess: PDF PDF (PDFA); 2018-01-1515:08 [PUBDB-2018-00650] Journal Article/Report/Contribution to a conference proceedings et al Heavy quark form factors at two loops in perturbative QCD [DESY-17-188, DO-TH 17/31, TTK-17-36, NIKHEF 2017-059] XLI International Conference of Theoretical Physics "Matter to the Deepest", Meeting locationPodlesice, Poland, 3 Sep 2017 - 8 Sep 2017 Acta physica Polonica / B / Proceedings supplement 48(12), 2155-2166 (2017) [DOI:10.5506/APhysPolB.48.2155]   We present the results for heavy quark form factors at two-loop order in perturbative QCD for different currents, namely vector, axial-vector, scalar and pseudo-scalar currents, up to second order in the dimensional regularization parameter. We outline the necessary computational details, ultraviolet renormalization and corresponding universal infrared structure.. Restricted: PDF PDF (PDFA); External link: Fulltext 2018-01-1514:52 [PUBDB-2018-00649] Journal Article/Report/Contribution to a conference proceedings Riemann, T. Scalar one-loop vertex integrals as meromorphic functions of space-time dimension $d$ [KW 17-002, DESY 17-186, DO-TH 17/29] XLI International Conference of Theoretical Physics “Matter to the Deepest”,, Meeting locationPodlesice, Poland, 3 Sep 2017 - 8 Sep 2017 Acta physica Polonica / B / Proceedings supplement 48(12), 2313-2320 (2017) [10.5506/APhysPolB.48.2313]   Representations are derived for the basic scalar one-loop vertex Feynman integrals as meromorphic functions of the space-time 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 $d=4+2n$, $n$ non-negative integers, may be derived from the representations easily. [...] Restricted: PDF PDF (PDFA); 2018-01-1508:33 [PUBDB-2018-00635] Preprint/Report et al The Heavy Quark Form Factors at Two Loops [DESY-17-102; DO-TH 17/16; Nikhef 2017-063; TTK-17-44; arXiv:1712.09889]   We compute the two-loop QCD corrections to the heavy quark form factors in case of the vector, axial-vector, scalar and pseudo-scalar currents up to second order in the dimensional parameter $\epsilon = (4-D)/2$. These terms are required in the renormalization of the higher order corrections to these form factors.. OpenAccess: PDF PDF (PDFA); 2018-01-1116:31 [PUBDB-2018-00554] Report/Journal Article et al Extracting the top-quark running mass using $t\bar{t} + \hbox {1-jet}$ events produced at the Large Hadron Collider [HU-EP-17-05; LAL-17-034; DESY-17-053; arXiv:1704.00540]   We present the calculation of the next-to-leading order QCD corrections for top-quark pair production in association with an additional jet at hadron colliders, using the modified minimal subtraction scheme to renormalize the top-quark mass. The results are compared to measurements at the Large Hadron Collider run I. [...] Restricted: PDF PDF (PDFA); 2018-01-1113:00 [PUBDB-2018-00474] Report/Journal Article et al Addendum to “Charm and bottom quark masses: An update” [DESY-17-152; FR-PHENO-2017-018; IPPP-17-72; TTP17-039; arXiv:1710.04249] Physical review / D 96(11), 116007 (2017) [10.1103/PhysRevD.96.116007]   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); 2018-01-1110:21 [PUBDB-2018-00428] Report/Journal Article et al Three Loop Massive Operator Matrix Elements and Asymptotic Wilson Coefficients with Two Different Masses [DESY-14-019; DO-TH-15-08; arXiv:1705.07030] Nuclear physics / B 921, 585 - 688 (2017) [10.1016/j.nuclphysb.2017.05.017]   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. 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. [...] OpenAccess: PDF PDF (PDFA); 2018-01-1009:38 [PUBDB-2018-00306] Journal Article Hoffman, M. On multiple zeta values of even arguments International journal of number theory 13(03), 705 - 716 (2017) [10.1142/S179304211750035X]   Published on 2016-10-04. Available in OpenAccess from 2017-10-04.: PDF PDF (PDFA); Restricted: PDF PDF (PDFA); 2017-12-2014:41 [PUBDB-2017-13874] Journal Article Moch, S. Strange sea determination from collider data Physics letters / B 777, 134 - 140 (2018) [10.1016/j.physletb.2017.12.024]   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 high-statistics ATLAS measurement of the W$^±$- and Z-boson 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 [...] OpenAccess: PDF PDF (PDFA); 2017-12-2014:21 [PUBDB-2017-13869] Contribution to a conference proceedings Marquard, P. Four-loop mass and field renormalization in the on-shell 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 2017 34 pp. (2017) [10.3204/PUBDB-2017-13869]   OpenAccess: PDF PDF (PDFA);