ZEU-THEO

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2017-04-28
13:17
DBCoverage [PUBDB-2017-02110] Report/Journal Article
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ADHM construction of instantons on the Torus
[hep-th/0005221; DIAS-STP-00-11; UNITU-THEP-6-2000; FSUJ-TPI-06-2000; DESY-00-080] ddc:530
We apply the ADHM instanton construction to SU(2) gauge theory on T n × R 4−n for n=1,2,3,4 . To do this we regard instantons on T n × R 4−n as periodic (modulo gauge transformations) instantons on R 4 . [...]
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2017-04-28
13:15
[PUBDB-2017-02109] Report/Journal Article
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ON-SHELL2: FORM based package for the calculation of two loop selfenergy single scale Feynman diagrams occurring in the standard model
[hep-ph/9907431] ddc:004
A FORM based package (ON-SHELL2) for the calculation of two loop self-energy diagrams with one nonzero mass in internal lines and the external momentum on the same mass shell is elaborated. The algorithm, based on recurrence relations obtained from the integration-by-parts method, allows us to reduce diagrams with arbitrary indices (powers of scalar propagators) to a set of master integrals. [...]
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2017-04-28
13:12
[PUBDB-2017-02108] Journal Article
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Thermal operators and cluster topology in the q -state Potts model
ddc:530
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2017-04-28
13:08
[PUBDB-2017-02106] Journal Article
; ; ; et al
Branching Fraction Measurements of the SM Higgs with a Mass of 160 GeV at Future Linear e$^+$e$^-$ Colliders
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2017-04-28
13:06
DBCoverage [PUBDB-2017-02105] Report/Journal Article
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On the Drell-Levy-Yan relation to O($\alpha^2_s$)
[hep-ph/0004172; DESY-98-144] ddc:530
We study the validity of a relation by Drell, Levy and Yan (DLY) connecting the deep inelastic structure (DIS) functions and the single-particle fragmentation functions in e^+e^- annihilation which are defined in the spacelike (q^2<0) and timelike (q^2>0) regions respectively. Here q denotes the momentum of the virtual photon exchanged in the deep inelastic scattering process or the annihilation process. [...]
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2017-04-28
13:04
DBCoverage [PUBDB-2017-02104] Report/Journal Article
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On the structure of the virtual Compton amplitude in the generalized Bjorken region: Integral relations
[hep-ph/0002071; DESY-00-005; UNIGRAZ-UTP-11-01-00] ddc:530
A systematic study is performed of the structure of the twist-2 contributions to the virtual Compton amplitude in deep-inelastic non-forward scattering for general spin states in the non-local light cone expansion. The gauge invariance is proven in this approach for the twist-2 contributions for non-forward scattering. [...]
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2017-04-28
13:02
[PUBDB-2017-02103] Report/Journal Article

Analytic continuation of Mellin transforms up to two loop order
[hep-ph/0003100; DESY-98-149] ddc:004
The analytic continuation of the Mellin transforms to complex values of N for the basic functions $g_i(x)$ of the momentum fraction x emerging in the quantities of massless QED and QCD up to two-loop order, as the unpolarized and polarized splitting functions, coefficient functions, and hard scattering cross sections for space- and time-like momentum transfer are evaluated. These Mellin transforms provide the analytic continuations of all finite harmonic sums up to the level of the threefold sums of transcendentality four, where the basis-set ${g_i(x)}$ consists of products of {\sc Nielsen}-integrals up to transcendentality four. [...]
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2017-01-30
10:03
OpenAccess [PUBDB-2017-00790] Journal Article
; ; ; et al
Five-loop quark mass and field anomalous dimensions for a general gauge group
ddc:530
We present analytical five-loop results for the quark mass and quark field anomalous dimensions, for a general gauge group and in the $\bar{MS}$ scheme. We confirm the values known for the gauge group SU(3) from an independent calculation, and find full agreement with results available from large-N$_f$ studies..
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2017-01-25
08:41
OpenAccess [PUBDB-2017-00759] Preprint/Report
; ; ; et al
Parton Distribution Functions, $\alpha_s$ and Heavy-Quark Masses for LHC Run II
[DESY-16-179; DO-TH-16-13]
 GO
We determine a new set of parton distribution functions (ABMP16), the strong coupling constant $\alpha_s$ and the quark masses $m_c$, $m_b$ and $m_t$ in a global fit to next-to-next-to-leading order (NNLO) in QCD. The analysis uses the $\overline{\mathrm{MS}}$ scheme for $\alpha_s$ and all quark masses and is performed in the fixed-flavor number scheme for $n_f=3, 4, 5$. [...]
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2017-01-18
13:11
OpenAccess [PUBDB-2017-00619] Report
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The Method of Arbitrarily Large Moments to Calculate Single Scale Processes in Quantum Field Theory
[DESY-17-009; DO-TH 17-01]
We device a new method to calculate a large number of Mellin moments of single scale quantities using the systems of differential and/or difference equations obtained by integration-by-parts identities between the corresponding Feynman integrals of loop corrections to physical quantities. These scalar quantities have a much simpler mathematical structure than the complete quantity. [...]
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