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1.
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Supernova limits on muonic dark forces
/ Manzari, Claudio Andrea (UC, Berkeley ; LBL, Berkeley) ; Martin Camalich, Jorge (IAC, La Laguna ; Laguna U., Tenerife ; CERN) ; Spinner, Jonas (U. Heidelberg, ITP ; KIT, Karlsruhe, TTP) ; Ziegler, Robert (Freiburg U. ; KIT, Karlsruhe, TTP)
Proto-neutron stars formed during core-collapse supernovae are hot and dense environments that contain a sizable population of muons. If these interact with new long-lived particles with masses up to roughly 100 MeV, the latter can be produced and escape from the stellar plasma, causing an excessive energy loss constrained by observations of SN 1987A. [...]
arXiv:2307.03143.-
2023-11-13 - 25 p.
- Published in : Phys. Rev. D 108 (2023) 103020
Fulltext: PDF;
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2.
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New Physics Searches at Kaon and Hyperon Factories
/ Goudzovski, Evgueni (Birmingham U.) ; Redigolo, Diego (CERN ; INFN, Florence) ; Tobioka, Kohsaku (Florida State U. ; KEK, Tsukuba) ; Zupan, Jure (Cincinnati U.) ; Alonso-Álvarez, Gonzalo (McGill U.) ; Alves, Daniele S.M. (Los Alamos) ; Bansal, Saurabh (Cincinnati U.) ; Bauer, Martin (Durham U., ICC) ; Brod, Joachim (Cincinnati U.) ; Chobanova, Veronika (Santiago de Compostela U., IGFAE) et al.
Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths and the availability of very large datasets. [...]
arXiv:2201.07805; FERMILAB-PUB-22-057-T.-
2023-01-06 - 68 p.
- Published in : Rep. Prog. Phys. 86 (2023) 016201
Fulltext: jt - PDF; 2201.07805 - PDF; 20769f2ea1acd21399f56329734230a9 - PDF; External link: Fermilab Accepted Manuscript
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3.
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Xenon1T excess from electron recoils of non-relativistic Dark Matter
/ Buttazzo, Dario (INFN, Pisa) ; Panci, Paolo (INFN, Pisa ; Pisa U.) ; Teresi, Daniele (Pisa U. ; CERN) ; Ziegler, Robert (KIT, Karlsruhe, TTP)
We show that electron recoils induced by non-relativistic Dark Matter interactions can fit well the recently reported Xenon1T excess, if they are mediated by a light pseudo-scalar in the MeV range. This is due to the favorable momentum-dependence of the resulting scattering rate, which partially compensates the unfavorable kinematics that tends to strongly suppress keV electron recoils. [...]
arXiv:2011.08919; CERN-TH-2020-165; TTP20-039; P3H-20-070.-
2021-06-10 - 6 p.
- Published in : Phys. Lett. B 817 (2021) 136310
Article from SCOAP3: PDF; Fulltext: PDF;
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4.
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Looking forward to Lepton-flavor-violating ALPs
/ Calibbi, Lorenzo (Nankai U.) ; Redigolo, Diego (INFN, Florence ; Florence U. ; CERN) ; Ziegler, Robert (Karlsruhe U., ITP) ; Zupan, Jure (Cincinnati U.)
We assess the status of past and future experiments on lepton flavor violating (LFV) muon and tau decays into a light, invisible, axion-like particle (ALP), $a$. We propose a new experimental setup for MEG II, the MEGII-fwd, with a forward calorimeter placed downstream from the muon stopping target. [...]
arXiv:2006.04795; P3H-20-024; TTP20-025.-
2021-09-27 - 62 p.
- Published in : JHEP 2109 (2021) 173
Fulltext: 2006.04795 - PDF; document - PDF; Fulltext from publisher: PDF;
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5.
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Quark Flavor Phenomenology of the QCD Axion
/ Martin Camalich, Jorge (IAC, La Laguna ; Laguna U., Tenerife) ; Pospelov, Maxim (Minnesota U. ; Minnesota U., Theor. Phys. Inst.) ; Vuong, Pham Ngoc Hoa (LPSC, Grenoble) ; Ziegler, Robert (CERN ; KIT, Karlsruhe, TTP) ; Zupan, Jure (Cincinnati U.)
Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing neutral currents, thus motivating QCD axion searches at precision flavor experiments. We rigorously derive limits on the most general effective flavor-violating couplings from current measurements and assess their discovery potential. [...]
arXiv:2002.04623.-
2020-07-28 - 24 p.
- Published in : Phys. Rev. D 102 (2020) 015023
Article from SCOAP3: PDF; Fulltext: PDF;
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6.
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Probing flavoured Axions in the Tail of $B_q \to \mu^+\mu^-$
/ Albrecht, Johannes (Dortmund U.) ; Stamou, Emmanuel (Chicago U., EFI ; ITPP, Lausanne) ; Ziegler, Robert (CERN ; KIT, Karlsruhe, TTP) ; Zwicky, Roman (U. Edinburgh, Higgs Ctr. Theor. Phys.)
We discuss how LHC di-muon data collected to study $B_q \to \mu\mu$ can be used to constrain light particles with flavour-violating couplings to $b$-quarks. Focussing on the case of a flavoured QCD axion, $a$, we compute the decay rates for $B_q \to \mu \mu a$ and the SM background process $B_q \to \mu \mu \gamma$ near the kinematic endpoint. [...]
arXiv:1911.05018; CP3-Origins-2019-38 DNRF90; TTP19-036.-
2021-09-22 - 37 p.
- Published in : JHEP 2021 (2020) 139
Fulltext: 1911.05018 - PDF; document - PDF; Fulltext from publisher: PDF;
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7.
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Axion-electron decoupling in nucleophobic axion models
/ Björkeroth, Fredrik (LNF, Dafne Light) ; Di Luzio, Luca (INFN, Pisa ; Pisa U.) ; Mescia, Federico (ICC, Barcelona U.) ; Nardi, Enrico (LNF, Dafne Light) ; Panci, Paolo (INFN, Pisa ; Pisa U. ; CERN ; Gran Sasso) ; Ziegler, Robert (CERN)
The strongest upper bounds on the axion mass come from astrophysical observations like the neutrino burst duration of SN1987A, which depends on the axion couplings to nucleons, or the white-dwarf cooling rates and red-giant evolution, which involve the axion-electron coupling. It has been recently argued that in variants of DFSZ models with generation-dependent Peccei-Quinn charges an approximate axion-nucleon decoupling can occur, strongly relaxing the SN1987A bound. [...]
arXiv:1907.06575; CERN-TH-2019-118; DESY-19-194.-
2020-02-20 - 5 p.
- Published in : Phys. Rev. D 101 (2020) 035027
Article from SCOAP3: PDF; Fulltext: PDF;
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8.
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Flavored Axions
/ Ziegler, Robert (CERN)
Precision flavor experiments can look for the QCD axion complementarily to usual searches with axion helio- and haloscopes, allowing to test PQ breaking scales as high as $10^{12} \, {\rm GeV}$. Such searches are sensitive to flavor-violating axion couplings, which are generic and potentially sizable whenever SM fermions carry flavor non-universal PQ charges. [...]
arXiv:1905.01084.-
SISSA, 2019-04-30 - 8 p.
- Published in : PoS CORFU2018 (2019) 035
Fulltext: 1905.01084 - PDF; PoS(CORFU2018)035 - PDF;
In : Corfu2018: 18th Hellenic School and Workshops on Elementary Particle Physics and Gravity, Corfu, Corfu, Greece, 31 Aug - 28 Sep 2018, pp.035
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9.
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Quark masses, CKM angles and Lepton Flavour Universality violation
/ Barbieri, Riccardo (Pisa, Scuola Normale Superiore ; INFN, Pisa) ; Ziegler, Robert (CERN)
A properly defined and suitably broken $U(2)$ flavour symmetry leads to successful quantitative relations between quark mass ratios and CKM angles. At the same time the intrinsic distinction introduced by $U(2)$ between the third and the first two families of quarks and leptons may support anomalies in charged and neutral current semi-leptonic $B$-decays of the kind tentatively observed in current flavour experiments. [...]
arXiv:1904.04121; CERN-TH-2019-041.-
2019-07-04 - 19 p.
- Published in : JHEP 1907 (2019) 023
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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10.
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Extended Gauge Mediation in the NMSSM with Displaced LHC Signals
/ Badziak, Marcin (Warsaw U.) ; Desai, Nishita (U. Montpellier 2, LUPM) ; Hugonie, Cyril (U. Montpellier 2, LUPM) ; Ziegler, Robert (CERN)
We analyze models of extended Gauge Mediation in the context of the NMSSM, concentrating on supersymmetric spectra with light gluinos, low fine-tuning and decays of the lightest neutralino leading to displaced vertices. While the minimal scenario has rather heavy gluinos as a result of restrictions from the Higgs sector, we propose two new models in which the gluino can be as light as allowed by direct searches at the LHC, with a mass of about 1.7 TeV and 2.0 TeV, respectively. [...]
arXiv:1810.05618; CERN-TH-2018-221.-
2019-01-28 - 12 p.
- Published in : Eur. Phys. J. C 79 (2019) 67
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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