1.
|
|
2.
|
Positive Moments for Scattering Amplitudes
/ Bellazzini, Brando (IPhT, Saclay ; CERN) ; Elias Miró, Joan (ICTP, Trieste) ; Rattazzi, Riccardo (EPFL, Lausanne, LPTP) ; Riembau, Marc (EPFL, Lausanne, LPTP ; Geneva U., Dept. Theor. Phys.) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.)
We find the complete set of conditions satisfied by the forward $2\to2$ scattering amplitude in unitarity and causal theories. These are based on an infinite set of energy dependent quantities -- the arcs -- which are dispersively expressed as moments of a positive measure defined at (arbitrarily) higher energies. [...]
arXiv:2011.00037.-
2021-08-01 - 17 p.
- Published in : Phys. Rev. D 104 (2021) 036006
Fulltext: PDF; Fulltext from publisher: PDF;
|
|
3.
|
New Constraint on Primordial Lepton Flavor Asymmetries
/ Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Kamada, Kohei (Tokyo U., RESCEU) ; Mukaida, Kyohei (KEK, Tsukuba ; Sokendai, Tsukuba) ; Schmitz, Kai (Munster U.) ; Yamada, Masaki (Tohoku U., Astron. Inst. ; Tohoku U.)
A chiral chemical potential present in the early universe can source helical hypermagnetic fields through the chiral plasma instability. If these hypermagnetic fields survive until the electroweak phase transition, they source a contribution to the baryon asymmetry of the universe. [...]
arXiv:2208.03237; CERN-TH-2022-134; RESCEU-13/22; KEK-TH-2441; MS-TP-22-23; TU-1164.-
2023-06-30 - 7 p.
- Published in : Phys. Rev. Lett. 130 (2023) 261803
Fulltext: 2208.03237 - PDF; Publication - PDF;
|
|
4.
|
Discovering true tauonium via two-photon fusion at $e^+e^-$ and hadron colliders
/ d'Enterria, David (CERN) ; Shao, Hua-Sheng (Paris, LPTHE)
The feasibility of observing true tauonium, the bound state of two tau leptons, $\mathcal{T}_0\equiv(\tau^+\tau^-)_0$, via photon-photon collisions at $e^+e^-$ colliders and at the LHC, is studied. The production cross sections of the process $\gamma\gamma\to\mathcal{T}_0\to\gamma\gamma$-- as well as those of all relevant backgrounds: spin-0 and 2 charmonium resonances decaying to diphotons, and light-by-light scattering -- are computed in the equivalent photon approximation for $e^+e^-$ collisions at BES III ($\sqrt{s} = 3.8$ GeV), Belle II ($\sqrt{s} = 10.6$ GeV), and FCC-ee ($\sqrt{s} = 91.2$ GeV), as well as for ultraperipheral p-p, p-Pb, and Pb-Pb collisions at the LHC. [...]
arXiv:2202.02316.-
2022-05-01 - 9 p.
- Published in : Phys. Rev. D 105 (2022) 093008
Fulltext: PDF;
|
|
5.
|
Forward-backward asymmetry in $B\to D^{*}\ell\nu$: One more hint for scalar leptoquarks?
/ Carvunis, Alexandre (Annecy, LAPTH) ; Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Guadagnoli, Diego (CERN ; Annecy, LAPTH) ; Gangal, Shireen (Annecy, LAPTH)
Experimental data have provided intriguing hints for the violation of lepton flavour universality (LFU), including $B\to D^{(*)}\tau\nu/B\to D^{(*)}\ell\nu$, the anomalous magnetic moment of the muon and $b\!\to\! s\ell^+\ell^-$ with a significance of $\!>3\,\sigma$, $>\!4\,\sigma$ and $>\!5\,\sigma$, respectively. Furthermore, in a recent re-analysis of 2018 Belle data, it was found that the forward-backward asymmetry ($\Delta A_{\rm FB}$) of $B \to D^{*}\mu\bar \nu$ vs $B\to D^{*}e\bar \nu$ disagrees with the SM prediction by $\approx\!\!4\,\sigma$, providing an additional sign of LFU violation. [...]
arXiv:2106.09610; CERN-TH-2021-092; LAPTH-020/21; PSI-PR-21-12; ZU-TH 27/21.-
2022-02-01 - 7 p.
- Published in : Phys. Rev. D 105 (2022) L031701
Fulltext: PhysRevD.105.L031701 - PDF; 2106.09610 - PDF;
|
|
6.
|
|
7.
|
Dynamically Induced Topological Inflation
/ Choi, Gongjun (CERN) ; Lin, Weikang (Tsung-Dao Lee Inst., Shanghai) ; Yanagida, Tsutomu T. (Tsung-Dao Lee Inst., Shanghai ; Tokyo U., IPMU)
We propose an inflation model in which the inflationary era is driven by the strong dynamics of $Sp(2)$ gauge theory. The quark condensation in the confined phase of $Sp(2)$ gauge theory generates the inflaton potential comparable to the energy of the thermal bath at the time of phase transition. [...]
arXiv:2204.03675; CERN-TH-2022-061.-
2023-02-01 - 5 p.
- Published in : Phys. Rev. D 107 (2023) 036005
Fulltext: 2204.03675 - PDF; Publication - PDF;
|
|
8.
|
Correlating $h\to\mu^+\mu^-$ to the Anomalous Magnetic Moment of the Muon via Leptoquarks
/ Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Mueller, Dario (Zurich U. ; PSI, Villigen) ; Saturnino, Francesco (Bern U.)
Recently, both ATLAS and CMS measured the decay $h\to\mu^+\mu^-$, finding a signal strength with respect to the Standard Model expectation of $1.2\pm0.6$ and $1.19\substack{+0.41+0.17\\-0.39 -0.16}$, respectively. This provides, for the first time, evidence that the Standard Model Higgs couples to second generation fermions. [...]
arXiv:2008.02643; CERN-TH-2020-134; PSI-PR-20-12; ZU-TH 28/20.-
2021-07-07 - 7 p.
- Published in : Phys. Rev. Lett. 127 (2021) 021801
Fulltext from publisher: PDF; External link: CERN Courier article
|
|
9.
|
Flavor Symmetries and Automatic Enhancement in the 6d Supergravity Swampland
/ Cvetic, Mirjam (Pennsylvania U. ; Maribor U. ; CERN) ; Lin, Ling (CERN) ; Turner, Andrew P. (Pennsylvania U.)
We argue for the quantum-gravitational inconsistency of certain 6d $\mathcal{N}=(1,0)$ supergravity theories, whose anomaly-free gauge algebra $\mathfrak{g}$ and hypermultiplet spectrum $M$ were observed in arxiv:2012.01437 to be realizable only as part of a larger gauge sector $(\mathfrak{g}' \supset \mathfrak{g}, M' \supset M)$ in F-theory. To detach any reference to a string theoretic method of construction, we utilize flavor symmetries to provide compelling reasons why the vast majority of such $(\mathfrak{g},M)$ theories are not compatible with quantum gravity constraints, and how the "automatic enhancement" to $(\mathfrak{g}', M')$ remedies this. [...]
arXiv:2110.00008; CERN-TH-2021-144; UPR-1315-T.-
2022-02-08 - 30 p.
- Published in : Phys. Rev. D 105 (2022) 046005
Fulltext: PDF;
|
|
10.
|
|