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Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma
/ Akita, Kensuke (Tokyo U.) ; Baur, Gideon (KIT, Karlsruhe, IAP ; U. Bonn, Phys. Inst., BCTP) ; Ovchynnikov, Maksym (KIT, Karlsruhe, IAP ; CERN) ; Schwetz, Thomas (KIT, Karlsruhe, IAP) ; Syvolap, Vsevolod (Leiden U.)
e investigate the cosmological impact of hypothetical unstable new physics particles that decay in the MeV-scale plasma of the Early Universe. [...]
arXiv:2411.00931.
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New physics decaying into metastable particles: impact on cosmic neutrinos
/ Akita, Kensuke (Tokyo U.) ; Baur, Gideon (KIT, Karlsruhe, IAP ; U. Bonn, Phys. Inst., BCTP) ; Ovchynnikov, Maksym (KIT, Karlsruhe, IAP ; CERN) ; Schwetz, Thomas (KIT, Karlsruhe, IAP) ; Syvolap, Vsevolod (Leiden U.)
We investigate decays of hypothetical unstable new physics particles into metastable species such as muons, pions, or kaons in the early Universe, when temperatures are in the MeV range, and study how they affect cosmic neutrinos. [...]
arXiv:2411.00892.
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KATRIN background due to surface radioimpurities
/ KATRIN Collaboration
The goal of the KArlsruhe TRItrium Neutrino (KATRIN) experiment is the determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c$^2$ at 90% C.L. This goal can only be achieved with a very low background level in the order of 0.01 counts per second. [...]
arXiv:2011.05107.-
2022-05 - 11 p.
- Published in : Astropart. Phys. 138 (2022) 102686
Fulltext: PDF; Fulltext from publisher: PDF;
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Three-loop $b\to s\gamma$ vertex with current-current operators
/ Fael, Matteo (CERN) ; Lange, Fabian (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute three-loop vertex corrections to $b\to s\gamma$ induced by current-current operators. The results are presented as expansions in $m_c/m_b$ with numerical coefficients which allow to cover all relevant values for the heavy quark masses in different renormalization schemes. [...]
arXiv:2309.14706; CERN-TH-2023-148; P3H-23-059; TTP23-035; ZU-TH 56/23.-
2023-11-23 - 21 p.
- Published in : JHEP 2311 (2023) 166
Fulltext: 2309.14706 - PDF; Publication - PDF;
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Towards the optimal beam dump experiment to search for feebly interacting particles
/ Bondarenko, Kyrylo (SISSA, Trieste ; IFPU, Trieste ; INFN, Trieste) ; Boyarsky, Alexey (Leiden U.) ; Jacobsson, Richard (CERN) ; Mikulenko, Oleksii (Leiden U.) ; Ovchynnikov, Maksym (KIT, Karlsruhe, IAP ; Leiden U.)
Future searches for new physics beyond the Standard Model are without doubt in need of a diverse approach and experiments with complementary sensitivities to different types of classes of models. One of the directions that should be explored is feebly interacting particles (FIPs) with masses below the electroweak scale. [...]
arXiv:2304.02511.-
2023-12-13 - 16 p.
- Published in : Eur. Phys. J. C 83 (2023) 1126
Fulltext: 2304.02511 - PDF; document - PDF;
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A seesaw model for large neutrino masses in concordance with cosmology
/ Escudero, Miguel (CERN) ; Schwetz, Thomas (KIT, Karlsruhe, IAP) ; Terol-Calvo, Jorge (IAC, La Laguna ; Laguna U., Tenerife)
Cosmological constraints on the sum of the neutrino masses can be relaxed if the number density of active neutrinos is reduced compared to the standard scenario, while at the same time keeping the effective number of neutrino species $N_{\rm eff}\approx 3$ by introducing a new component of dark radiation. We discuss a UV complete model to realise this idea, which simultaneously provides neutrino masses via the seesaw mechanism. [...]
arXiv:2211.01729; CERN-TH-2022-180.-
2023-02-14 - 20 p.
Fulltext: Addendum - PDF; document - PDF; 2211.01729 - PDF; Publication - PDF;
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Non-minimally flavour violating dark matter
/ Blanke, Monika (CERN ; KIT, Karlsruhe, IKP ; KIT, Karlsruhe, TTP)
Flavour symmetries provide an appealing mechanism to stabilize the dark matter particle. I present a simple model of quark flavoured dark matter that goes beyond the framework of minimal flavour violation. [...]
CERN-PH-TH-2015-028; TTP15-004; arXiv:1502.03385; CERN-PH-TH-2015-028; TTP15-004.-
Geneva : CERN, 2015-07-30 - 9 p.
- Published in : J. Phys.: Conf. Ser. 631 (2015) 012022
IOP Open Access article: PDF; Preprint: PDF; External link: Preprint
In : 4th Symposium on Prospects in the Physics of Discrete Symmetries, London, UK, 2 - 6 Dec 2014, pp.012022
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Double Higgs boson production at NLO: combining the exact numerical result and high-energy expansion
/ Davies, Joshua (KIT, Karlsruhe, TTP) ; Heinrich, Gudrun (Munich, Max Planck Inst.) ; Jones, Stephen P. (CERN) ; Kerner, Matthias (Zurich U.) ; Mishima, Go (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IKP) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP) ; Wellmann, David (KIT, Karlsruhe, TTP)
We consider the next-to-leading order QCD corrections to Higgs boson pair production, using our recent calculation of the form factors in the high-energy limit. We compute the virtual corrections to the partonic cross section, applying Pad\'e approximations to extend the range of validity of the high-energy expansion. [...]
arXiv:1907.06408; CERN-TH-2019-103; MPP-2019-128; P3H-19-015; TTP19-018; ZU-TH 34/19.-
2019-11-05 - 21 p.
- Published in : JHEP 1911 (2019) 024
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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