CERN Accelerating science

TH Articles

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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 Fulltext: PDF;

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2021-09-19
15:48
On the chiral anomaly and the Yang–Mills gradient flow / Lüscher, Martin (CERN ; 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 - 4 p. - Published in : Phys. Lett. B 823 (2021) 136725 Fulltext: PDF; Fulltext from publisher: 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 - 31 p. - Published in : JHEP 2110 (2021) 061 Fulltext: document - PDF; 2107.07353 - 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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2021-07-16
01:47
Hawking radiation by spherically-symmetric static black holes for all spins. II. Numerical emission rates, analytical limits, and new constraints / Arbey, Alexandre (IP2I, Lyon ; CERN ; IUF, Paris) ; Auffinger, Jérémy (IP2I, Lyon) ; Geiller, Marc (ENS, Lyon, Lab. Phys.) ; Livine, Etera R. (ENS, Lyon, Lab. Phys.) ; Sartini, Francesco (ENS, Lyon, Lab. Phys.)
In the companion paper [Phys. Rev. [...]
arXiv:2107.03293; CERN-TH-2021-105.- 2021-10-04 - 22 p. - Published in : Phys. Rev. D 104 (2021) 084016 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-07-15
04:59
$\tau \to \ell +$ invisible through invisible-savvy collider variables / Guadagnoli, Diego (CERN ; Annecy, LAPTH) ; Park, Chan Beom (IBS, Daejeon, CTPU) ; Tenchini, Francesco (INFN, Pisa ; DESY)
New particles $\phi$ in the MeV-GeV range produced at colliders and escaping detection can be searched for at operating $b-$ and $\tau-$factories such as Belle II. A typical search topology involves pair-produced $\tau$s (or mesons), one of which decaying to visibles plus the $\phi$, and the other providing a tag. [...]
arXiv:2106.16236; CERN-TH-2021-101; LAPTH-023/21; CTPU-PTC-21-28.- 2021-11-10 - 8 p. - Published in : Phys. Lett. B 822 (2021) 136701 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-07-15
04:59
Gauge group topology of 8D Chaudhuri-Hockney-Lykken vacua / Cvetic, Mirjam (Pennsylvania U. ; Maribor U.) ; Dierigl, Markus (Munich U., ASC) ; Lin, Ling (CERN) ; Zhang, Hao Y. (Pennsylvania U.)
Compactifications of the CHL string to eight dimensions can be characterized by embeddings of root lattices into the rank 12 momentum lattice $\Lambda_M$, the so-called Mikhailov lattice. Based on this data, we devise a method to determine the global gauge group structure including all $U(1)$ factors. [...]
arXiv:2107.04031; CERN-TH-2021-104; UPR-1313-T; LMU-ASC 19/21.- 2021-10-12 - 18 p. - Published in : Phys. Rev. D 104 (2021) 086018 Fulltext: 2107.04031 - PDF; Fulltext - PDF;

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2021-06-22
04:44
Backreaction from inhomogeneous matter fields during large-scale structure formation / Floerchinger, Stefan (U. Heidelberg, ITP) ; Tetradis, Nikolaos (Athens U.) ; Wiedemann, Urs Achim (CERN)
We study how inhomogeneities of the cosmological fluid fields backreact on the homogeneous part of energy density and how they modify the Friedmann equations. In general, backreaction requires to go beyond the pressureless ideal fluid approximation, and this can lead to a reduced growth of cosmological large scale structure. [...]
arXiv:2106.10184; CERN-TH-2021-095.- 2021-10-08 - 11 p. - Published in : Phys. Rev. D 104 (2021) 083522 Fulltext: PDF; Fulltext form publisher: PDF;

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2021-06-11
04:17
Higher spin wormholes from modular bootstrap / Das, Diptarka (Indian Inst. Tech., Kanpur) ; Datta, Shouvik (CERN)
We investigate the connection between spacetime wormholes and ensemble averaging in the context of higher spin AdS$_3$/CFT$_2$. Using techniques from modular bootstrap combined with some holographic inputs, we evaluate the partition function of a Euclidean wormhole in AdS$_3$ higher spin gravity. [...]
arXiv:2106.03889; CERN-TH-2021-085.- 2021 - 27 p. - Published in : JHEP 2021 (2020) 010 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-06-11
04:17
An analysis of Bayesian estimates for missing higher orders in perturbative calculations / Duhr, Claude (CERN) ; Huss, Alexander (CERN) ; Mazeliauskas, Aleksas (CERN) ; Szafron, Robert (Brookhaven)
With current high precision collider data, the reliable estimation of theoretical uncertainties due to missing higher orders (MHOs) in perturbation theory has become a pressing issue for collider phenomenology. Traditionally, the size of the MHOs is estimated through scale variation, a simple but ad hoc method without probabilistic interpretation. [...]
arXiv:2106.04585; CERN-TH-2021-058.- 2021-09-20 - 63 p. - Published in : JHEP 2109 (2021) 122 Fulltext: 2106.04585 - PDF; document - PDF;

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