20210529 08:49 
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20210518 08:38 
On factorisation schemes for the electron parton distribution functions in QED
/ Frixione, Stefano (INFN, Genoa ; CERN)
The electron, positron, and photon Parton Distribution Functions (PDFs) of the unpolarised electron have recently been computed at the nexttoleading logarithmic accuracy in QED, by adopting the $\overline{\rm MS}$ factorisation scheme. We present here analogous results, obtained by working in a different framework that is inspired by the socalled DIS scheme. [...]
arXiv:2105.06688; CERNTH2021078.
20210723  33 p.
 Published in : JHEP 2107 (2021) 180
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20210501 04:40 
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20210427 04:52 
Dark matter and the early Universe: a review
/ Arbey, A. (IP2I, Lyon ; CERN ; IUF, Paris) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; IUF, Paris)
Dark matter represents currently an outstanding problem in both cosmology and particle physics. In this review we discuss the possible explanations for dark matter and the experimental observables which can eventually lead to the discovery of dark matter and its nature, and demonstrate the close interplay between the cosmological properties of the early Universe and the observables used to constrain dark matter models in the context of new physics beyond the Standard Model..
arXiv:2104.11488; CERNTH2021066.
202107  41 p.
 Published in : Prog. Part. Nucl. Phys. 119 (2021) 103865
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20210422 11:42 
Nonabelian infrared divergences on the celestial sphere
/ Magnea, Lorenzo (CERN ; INFN, Turin ; Turin U.)
We consider the infrared factorisation of nonabelian multiparticle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the `celestial sphere' intersecting the future lightcone at asymptotic distances. We find that colourdipole contributions to the infrared operator, to all orders in perturbation theory, have a remarkably simple expression in these coordinates, with scale and coupling dependence factorised from kinematics and colour. [...]
arXiv:2104.10254; CERNTH2021063.
20210531  23 p.
 Published in : JHEP 2105 (2021) 282
Article from SCOAP3: PDF; Fulltext: PDF;

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20210415 05:11 
Precision calculation of dark radiation from spinning primordial black holes and early matterdominated eras
/ Arbey, Alexandre (IP2I, Lyon ; CERN ; IUF, Paris) ; Auffinger, Jérémy (IP2I, Lyon) ; Sandick, Pearl (Utah U.) ; Shams Es Haghi, Barmak (Utah U.) ; Sinha, Kuver (Oklahoma U.)
We present precision calculations of dark radiation in the form of gravitons coming from Hawking evaporation of spinning primordial black holes (PBHs) in the early Universe. Our calculation incorporates a careful treatment of extended spin distributions of a population of PBHs, the PBH reheating temperature, and the number of relativistic degrees of freedom. [...]
arXiv:2104.04051; CERNTH2021049.
20210615  18 p.
 Published in : Phys. Rev. D 103 (2021) 123549
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20210413 04:41 
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20210409 04:00 
Consequences of chirally enhanced explanations of $(g2)_\mu$ for $h\to \mu\mu$ and $Z\to \mu\mu$
/ Crivellin, Andreas (CERN ; PSI, Villigen ; Zurich U.) ; Hoferichter, Martin (U. Bern, AEC)
With the longstanding tension between experiment and StandardModel (SM) prediction in the anomalous magnetic moment of the muon $a_\mu$ recently reaffirmed by the Fermilab experiment, the crucial question becomes which other observables could be sensitive to the underlying physics beyond the SM to which $a_\mu$ may be pointing. While from the effective field theory (EFT) point of view no direct correlations exist, this changes in specific new physics models. [...]
arXiv:2104.03202; CERNTH2021050; PSIPR2104; ZUTH 14/21.
20210407  21 p.
 Published in : JHEP 2107 (2021) 135
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20210331 04:11 
Renormalization of the topological charge density in QCD with dimensional regularization
/ Lüscher, Martin (CERN ; U. Bern, AEC) ; Weisz, Peter (Munich, Max Planck Inst.)
To all orders of perturbation theory, the renormalization of the topological charge density in dimensionally regularized QCD is shown to require no more than an additive renormalization proportional to the divergence of the flavoursinglet axial current. The proof is based on the standard BRS analysis of the QCD vertex functional in the background gauge and exploits the special algebraic properties of the charge density through the StoraZumino chain of descent equations..
arXiv:2103.15440; CERNTH2021041; MPP202138.
2021  11 p.
 Published in : Eur. Phys. J. C 81 (2021) 519
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20210317 04:47 
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