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TH Articles

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2021-11-17
06:21
Vacuum correlators at short distances from lattice QCD / Harris, Tim ; Cè, Marco ; Meyer, Harvey B. ; Toniato, Arianna ; Török, Csaba
We propose a method to help control cutoff effects in the short-distance contribution to integrated correlation functions, such as the hadronic vacuum polarization (HVP), using the corresponding screening correlators computed at finite temperature. The strategy is investigated with Wilson fermions at leading order, which reveals a logarithmically-enhanced lattice artifact in the short-distance contribution, whose coefficient is determined at this order. [...]
arXiv:2111.07948; CERN-TH-2021-189.- 2021-11-15 - 9 p. - Published in : PoS: LATTICE2021 (2021) , pp. 572
Fulltext: PDF;
In : 38th International Symposium on Lattice Field Theory, Online, 26 - 30 Jul 2021, pp.572

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2021-10-06
11:30
Logarithmic accuracy of angular-ordered parton showers / Bewick, Gavin (Durham U., IPPP) ; Ferrario Ravasio, Silvia (Durham U., IPPP) ; Richardson, Peter (Durham U., IPPP ; CERN) ; Seymour, Michael H. (Manchester U.)
We study the logarithmic accuracy of angular-ordered parton showers by considering the singular limits of multiple emission matrix elements. This allows us to consider different choices for the evolution variable and propose a new choice which has both the correct logarithmic behaviour and improved performance away from the singular regions. [...]
arXiv:1904.11866; MAN/HEP/2019/003; CERN-TH-2019-047; MCnet-19-08; IPPP/19/30.- 2020-04-03 - 28 p. - Published in : JHEP 2004 (2020) 019 Article from SCOAP3: PDF; Fulltext: PDF;

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2021-09-19
15:48
On the chiral anomaly and the Yang–Mills gradient flow / Lüscher, Martin (CERN ; Bern U. ; U. Bern, AEC)
There are currently two singularity-free universal expressions for the topological susceptibility in QCD, one based on the Yang-Mills gradient flow and the other on density-chain correlation functions. While the latter link the susceptibility to the anomalous chiral Ward identities, the gradient flow permits the emergence of the topological sectors in lattice QCD to be understood. [...]
arXiv:2109.07965; CERN-TH-2021-132.- 2021-12-10 - 9 p. - Published in : Phys. Lett. B 823 (2021) 136725 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-09-17
04:42
Theory Closing Talk / Giudice, Gian F. (CERN)
In this talk I make some remarks about the search for the origin of the electroweak scale..
arXiv:2109.07176; CERN-TH-2021-134.- 2021-11-17 - 8 p. - Published in : 10.22323/1.397.0019 Fulltext: 2109.07176 - PDF; document - PDF;
In : 9th Annual Large Hadron Collider Physics (LHCP 2021), Online, Gb, 7 - 12 Jun 2021, pp.019

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2021-08-07
04:45
Physics Beyond the Standard Model with BlackHawk v2.0 / Arbey, Alexandre (IP2I, Lyon ; CERN ; IUF, Paris) ; Auffinger, Jérémy (IP2I, Lyon)
We present the new version v2.0 of the public code BlackHawk designed to compute the Hawking radiation of black holes, with both primary and hadronized spectra. This new version aims at opening an avenue toward physics beyond the Standard Model (BSM) in Hawking radiation. [...]
arXiv:2108.02737; CERN-TH-2021-117.- 2021 - 14 p. - Published in : Eur. Phys. J. C 81 (2021) 910 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-08-05
09:06
Primordial black holes from Gauss-Bonnet-corrected single field inflation / Kawai, Shinsuke (Sungkyunkwan U.) ; Kim, Jinsu (CERN)
Primordial blackholes formed in the early Universe via gravitational collapse of over-dense regions may contribute a significant amount to the present dark matter relic density. Inflation provides a natural framework for the production mechanism of primordial blackholes. [...]
arXiv:2108.01340; CERN-TH-2021-115.- 2021-10-15 - 9 p. - Published in : Phys. Rev. D 104 (2021) 083545 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-07-31
04:03
First-Generation New Physics in Simplified Models: From Low-Energy Parity Violation to the LHC / Crivellin, Andreas (Zurich U. ; PSI, Villigen ; CERN) ; Hoferichter, Martin (Bern U. ; U. Bern, AEC) ; Kirk, Matthew (Rome U. ; INFN, Rome) ; Manzari, Claudio Andrea (Zurich U. ; PSI, Villigen) ; Schnell, Luc (Paris, LPTHE ; Zurich, ETH ; Ec. Polytech., Palaiseau (main))
New-physics (NP) constraints on first-generation quark-lepton interactions are particularly interesting given the large number of complementary processes and observables that have been measured. Recently, first hints for such NP effects have been observed as an apparent deficit in first-row CKM unitarity, known as the Cabibbo angle anomaly, and the CMS excess in $q\bar q\to e^+e^-$. [...]
arXiv:2107.13569; CERN-TH-2021-112; PSI-21-16; ZU-TH 32/21.- 2021-10-27 - 40 p. - Published in : JHEP 2110 (2021) 221 Fulltext: document - PDF; 2107.13569 - PDF;

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2021-07-16
08:18
Next-to-leading power two-loop soft functions for the Drell-Yan process at threshold / Broggio, Alessandro (Milan Bicocca U. ; INFN, Milan Bicocca) ; Jaskiewicz, Sebastian (Durham U., IPPP) ; Vernazza, Leonardo (CERN ; Turin U. ; INFN, Turin)
We calculate the generalized soft functions at $\mathcal{O}(\alpha_s^2)$ at next-to-leading power accuracy for the Drell-Yan process at threshold. The operator definitions of these objects contain explicit insertions of soft gauge and matter fields, giving rise to a dependence on additional convolution variables with respect to the leading power result. [...]
arXiv:2107.07353; IPPP/21/06; CERN-TH-2021-108.- 2021-10-07 - 33 p. - Published in : JHEP 2110 (2021) 061 Fulltext: document - PDF; 2107.07353 - PDF;

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2021-07-16
03:22
The role of colour flows in matrix element computations and Monte Carlo simulations / Frixione, Stefano (INFN, Genoa ; CERN) ; Webber, Bryan R. (Cambridge U.)
We discuss how colour flows can be used to simplify the computation of matrix elements, and in the context of parton shower Monte Carlos with accuracy beyond leading-colour. We show that, by systematically employing them, the results for tree-level matrix elements and their soft limits can be given in a closed form that does not require any colour algebra. [...]
arXiv:2106.13471; CERN-TH-2021-098.- 2021-11-08 - 75 p. - Published in : JHEP 2111 (2021) 045 Fulltext: document - PDF; 2106.13471 - PDF;

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2021-07-16
03:12
Bremsstrahlung photons from stopping in heavy-ion collisions / Park, Sohyun (CERN) ; Wiedemann, Urs Achim (CERN)
We examine the spectrum of bremsstrahlung photons that results from the stopping of the initial net charge distributions in ultrarelativistic nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect has escaped detection so far since it becomes sizable only at very low transverse momentum and at sufficiently forward rapidity. [...]
arXiv:2107.05129; CERN-TH-2021-106.- 2021-10-04 - 7 p. - Published in : Phys. Rev. C 104 (2021) 4 Fulltext: Fulltext - PDF; 2107.05129 - PDF;

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