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CERN Document Server 2,045 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 0.57 секунд. 
1.
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Irreducible Axion Background / Langhoff, Kevin (UC, Berkeley ; LBL, Berkeley) ; Outmezguine, Nadav Joseph (UC, Berkeley ; LBL, Berkeley) ; Rodd, Nicholas L. (CERN)
Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age of the Universe. A corollary statement is that the abundance of any particle that can decay into photons over cosmological timescales is constrained to be much smaller than the cold dark-matter density. [...]
arXiv:2209.06216; CERN-TH-2022-148.- 2022-12-05 - 21 p. - Published in : Phys. Rev. Lett. 129 (2022) 241101 Fulltext: PDF;
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Interpreting LHCb's $\Lambda_b\to \Lambda_c\tau\bar\nu$ measurement and puzzles in semileptonic $\Lambda_b$ decays / Bernlochner, Florian U. (Bonn U.) ; Ligeti, Zoltan (LBL, Berkeley ; UC, Berkeley) ; Papucci, Michele (Caltech) ; Robinson, Dean J. (LBL, Berkeley ; UC, Berkeley)
Normalizing the recent LHCb measurement of $\Lambda_b \to \Lambda_c \tau \bar\nu$ to the standard model (SM) prediction for the $\Lambda_b \to \Lambda_c \mu \bar\nu$ rate, instead of a LEP measurement, provides a more consistent comparison with the SM prediction for the lepton flavor universality ratio $R(\Lambda_c)$. This modestly increases $R(\Lambda_c)$ compared to the quoted LHCb result, such that it no longer hints at a suppression compared to the SM, which would be hard to accommodate in new physics scenarios that enhance $R(D^{(*)})$. [...]
arXiv:2206.11282; CALT-TH-2022-023.- 2023-01-01 - 3 p. - Published in : Phys. Rev. D 107 (2023) L011502 Fulltext: 2206.11282 - PDF; Publication - PDF;
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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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Axion Star Explosions: A New Source for Axion Indirect Detection / Escudero, Miguel (CERN) ; Pooni, Charis Kaur (King's Coll. London) ; Fairbairn, Malcolm (King's Coll. London) ; Blas, Diego (Barcelona, Autonoma U. ; Barcelona, IFAE) ; Du, Xiaolong (Carnegie Inst. Observ. ; UCLA) ; Marsh, David J.E. (King's Coll. London)
If dark matter is composed of axions, then axion stars form in the cores of dark matter halos. These stars are unstable above a critical mass, decaying to radio photons that heat the intergalactic medium, offering a new channel for axion indirect detection. [...]
arXiv:2302.10206; KCL-PH-TH-2023-16; CERN-TH-2023-029.- 2024-02-08 - 16 p. - Published in : Phys. Rev. D 109 (2024) 043018 Fulltext: Publication - PDF; 2302.10206 - PDF; External link: TheConversation article
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Searches for axion-like particles via $\gamma \gamma$ fusion at future $\mathrm{e}^+\mathrm{e}^-$ colliders / Rebello Teles, Patricia (Rio de Janeiro, CBPF) ; d'Enterria, David (CERN) ; Gonçalves, Victor P. (Pelotas U. ; Lanzhou, Inst. Modern Phys.) ; Martins, Daniel E. (Cracow, INP)
Opportunities for searches for axion-like particles (ALPs) coupling to photons in $\mathrm{e}^+\mathrm{e}^-$ collisions at the Future Circular Collider (FCC-ee) and International Linear Collider (ILC) are investigated. We perform a study of the photon-fusion production of ALPs decaying into two photons, $\mathrm{e}^+\mathrm{e}^- \overset{\gamma \gamma}{\longrightarrow} \mathrm{e}^{+}\;a(\gamma \gamma)\;\mathrm{e}^{-}$, over the light-by-light continuum background, for the planned FCC-ee and ILC center-of-mass energies and integrated luminosities. [...]
arXiv:2310.17270.- 2024-03-01 - 15 p. - Published in : Phys. Rev. D 109 (2024) 055003 Fulltext: 2310.17270 - PDF; Publication - PDF;
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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;
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Neutron stars as photon double-lenses: Constraining resonant conversion into ALPs / Bondarenko, Kyrylo (IFPU, Trieste ; SISSA, Trieste ; INFN, Trieste) ; Boyarsky, Alexey (Leiden U.) ; Pradler, Josef (Vienna, OAW ; Vienna U. ; CERN) ; Sokolenko, Anastasia (Fermilab ; Chicago U., KICP)
Axion-photon conversion is a prime mechanism to detect axion-like particles that share a coupling to the photon. We point out that in the vicinity of neutron stars with strong magnetic fields, magnetars, the effective photon mass receives comparable but opposite contributions from free electrons and the radiation field. [...]
arXiv:2203.08663; UWThPh 2023-22; FERMILAB-PUB-22-170-V.- 2023-10-11 - 7 p. - Published in : Phys. Lett. B 846 (2023) 138238 Fulltext: 2203.08663 - PDF; FERMILAB-PUB-22-170-V - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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Precision Measurement of Reactor Antineutrino Oscillation at Kilometer-Scale Baselines by Daya Bay / Daya Bay Collaboration
We present a new determination of the smallest neutrino mixing angle ${\theta}_{13}$ and the mass-squared difference ${\Delta}{\rm m}^{2}_{32}$ using a final sample of $5.55 \times 10^{6}$ inverse beta-decay (IBD) candidates with the final-state neutron captured on gadolinium. This sample was selected from the complete data set obtained by the Daya Bay reactor neutrino experiment in 3158 days of operation. [...]
arXiv:2211.14988.- 2023-04-21 - 7 p. - Published in : Phys. Rev. Lett. 130 (2023) 161802 Fulltext: PDF;
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Discrete R-symmetry, various energy scales, and gravitational waves / Choi, Gongjun (CERN) ; Lin, Weikang (Shanghai Jiao Tong U.) ; Yanagida, Tsutomu T. (Shanghai Jiao Tong U. ; Tokyo U.)
We present a supersymmetric model where energy scales of a discrete $R$-symmetry breaking ($Z_{6R}$) and cosmic inflation are commonly attributed to the confinement scale of a hidden $Sp(2)$ strong dynamics. Apart from these, SUSY-breaking scale, the Higgsino mass and the right-handed neutrino masses are all shown to stem from $Z_{6R}$ breaking scale inferred from CMB observables. [...]
arXiv:2201.03083; CERN-TH-2022-002.- 2022-03-01 - 28 p. - Published in : Phys. Rev. D 105 (2022) 055033 Fulltext: PhysRevD.105.055033 - PDF; 2201.03083 - PDF;
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Froissart Bound on Total Cross-section without Unknown Constants / Martin, André (CERN) ; Roy, S.M. (Tata Inst.)
We determine the scale of the logarithm in the Froissart bound on total cross-sections using absolute bounds on the D-wave below threshold for $\pi\pi$ scattering. E.g. [...]
arXiv:1306.5210; CERN-PH-TH-2013-113; CERN-PH-TH-2013-113.- 2014-02-25 - 7 p. - Published in : Phys. Rev. D 89 (2014) 045015 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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