2021-05-29
08:49 |
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2021-04-27
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; CERN-TH-2021-066.-
2021-07 - 41 p.
- Published in : Prog. Part. Nucl. Phys. 119 (2021) 103865
Fulltext: PDF;
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2021-04-22
11:42 |
Non-abelian infrared divergences on the celestial sphere
/ Magnea, Lorenzo (CERN ; INFN, Turin ; Turin U.)
We consider the infrared factorisation of non-abelian multi-particle 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 light-cone at asymptotic distances. We find that colour-dipole 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; CERN-TH-2021-063.-
2021-05-31 - 23 p.
- Published in : JHEP 2105 (2021) 282
Article from SCOAP3: PDF; Fulltext: PDF;
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2021-03-17
04:47 |
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2021-02-25
04:20 |
Semi-automated BSM model building procedures in MARTY-1.1 through a 2HDM example
/ Uhlrich, G. (IP2I, Lyon) ; Mahmoudi, F. (IP2I, Lyon ; CERN) ; Arbey, A. (IP2I, Lyon ; CERN ; IUF, Paris)
MARTY is a C++ computer algebra system specialized for High Energy Physics that can calculate amplitudes, squared amplitudes and Wilson coefficients in a large variety of beyond the Standard Model scenarios up to the one-loop order. It is fully independent of any other framework and its main development guideline is generality, in order to be adapted easily to any type of model. [...]
arXiv:2102.11551; CERN-TH-2021-025.-
SISSA, 2021-05-10 - 14 p.
- Published in : PoS TOOLS2020 (2020) 042
Fulltext: 2102.11551 - PDF; PoS(TOOLS2020)042 - PDF;
In : Tools for High Energy Physics and Cosmology, Lyon, France, 2 - 6 Nov 2020, pp.042
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2021-01-22
04:13 |
Combined Constraints on First Generation Leptoquarks
/ Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Müller, Dario (Zurich U. ; PSI, Villigen) ; Schnell, Luc (Zurich, ETH ; Ec. Polytech., Palaiseau (main))
In this article we perform a combined analysis of low energy precision constraints and LHC searches for leptoquarks which couple to first generation fermions. Considering all ten leptoquark representations, five scalar and five vector ones, we study at the precision frontier the constraints from $K\to\pi\nu\nu$, $K\to\pi e^+e^-$, $K^0-\bar K^0$ and $D^0-\bar D^0$ mixing, as well as from experiments searching for parity violation (APV and QWEAK). [...]
arXiv:2101.07811; CERN-TH-2021-012; PSI-PR-21-01; ZU-TH 01/21; arXiv:2104.06417; ZU-TH 16/21; PSI-PR-21-05; CERN-TH-2021-053.-
2021 - 13 p.
- Published in : Phys. Rev., D 103 (2021) 115023
Fulltext from publisher: PDF; Preprint: PDF; Preprint Addendum: PDF;
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2021-01-20
04:01 |
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2021-01-16
04:01 |
Radiation Reaction from Soft Theorems
/ Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Royal Inst. Tech., Stockholm) ; Heissenberg, Carlo (Nordita ; Royal Inst. Tech., Stockholm ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
Radiation reaction (RR) terms at the third post-Minkowskian (3PM) order have recently been found to be instrumental in restoring smooth continuity between the non-relativistic, relativistic, and ultra-relativistic (including the massless) regimes. Here we propose a new and intriguing connection between RR and soft (bremsstrahlung) theorems which short-circuits the more involved conventional loop computations. [...]
arXiv:2101.05772; CERN-TH-2021-008; NORDITA 2021-001; QMUL-PH-21-03; UUITP-03/21.-
2021-07-10 - 17 p.
- Published in : Phys. Lett. B 818 (2021) 136379
Article from SCOAP3: PDF; Fulltext: PDF;
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2021-01-15
04:01 |
Axion assisted Schwinger effect
/ Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Ema, Yohei (DESY) ; Mukaida, Kyohei (CERN)
We point out an enhancement of the pair production rate of charged fermions in a strong electric field in the presence of time dependent classical axion-like background field, which we call axion assisted Schwinger effect. While the standard Schwinger production rate is proportional to $\exp(-\pi(m^2+p_T^2 )/E)$, with $m$ and $p_T$ denoting the fermion mass and its momentum transverse to the electric field $E$, the axion assisted Schwinger effect can be enhanced at large momenta to $\exp(-\pi m^2/E)$. [...]
arXiv:2101.05192; DESY-21-006; CERN-TH-2021-010.-
2021-05-03 - 18 p.
- Published in : JHEP 2105 (2021) 001
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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2021-01-15
04:01 |
The Schwarzian sector of higher spin CFTs
/ Datta, Shouvik (CERN)
Two-dimensional conformal field theories with Virasoro symmetry generically contain a Schwarzian sector. This sector is related to the near-horizon region of the near-extremal BTZ black hole in the holographic dual. [...]
arXiv:2101.04980; CERN-TH-2021-009.-
2021-04-19 - 22 p.
- Published in : JHEP 2104 (2021) 171
Article from SCOAP3: PDF; Fulltext: PDF;
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