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CERN Document Server 13 records found  1 - 10próximo  jump to record: Search took 0.69 seconds. 
1.
How large could CP violation in neutral $B$ meson mixing be? Implications for baryogenesis and upcoming searches / Miró, Carlos (Valencia U.) ; Escudero, Miguel (CERN) ; Nebot, Miguel (Valencia U.)
CP violation in neutral $B$ meson oscillations is an experimental observable that could be directly related to the baryon asymmetry of the Universe through the $B$-Mesogenesis mechanism. [...]
CERN-TH-2024-172 ; arXiv:2410.13936. - 28.
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2.
Living at the Edge: A Critical Look at the Cosmological Neutrino Mass Bound / Naredo-Tuero, Daniel (Madrid, Autonoma U. ; Madrid, IFT) ; Escudero, Miguel (CERN) ; Fernández-Martínez, Enrique (Madrid, Autonoma U. ; Madrid, IFT) ; Marcano, Xabier (Madrid, Autonoma U. ; Madrid, IFT) ; Poulin, Vivian (U. Montpellier 2, LUPM)
Cosmological neutrino mass bounds are becoming increasingly stringent. [...]
arXiv:2407.13831 ; CERN-TH-2024-115 ; IFT-UAM/CSIC-24-106. - 19.
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Modern Neutrino Cosmology / Escudero Abenza, Miguel (speaker) (CERN)
Neutrinos are ubiquitous in cosmology and they always represent a substantial fraction of the energy density of the Universe. This makes cosmology a key arena to test the properties of the most elusive particles in the Standard Model. [...]
2024 - 4002. Theory Colloquia External link: Event details In : Modern Neutrino Cosmology
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4.
Axion Star Explosions and the Reionization History of the Universe / Escudero, Miguel (CERN)
Cosmological structure formation simulations of ultralight axion-like dark matter have shown that an axion star forms at the center of every dark matter halo in the Universe. These axion stars would then form in large numbers during the dark ages, $z \lesssim 70$. [...]
arXiv:2402.06547; CERN-TH-2024-023.- 2024-03-01 - 11 p. - Published in : PoS COSMICWISPers (2024) 012 Fulltext: document - PDF; 2402.06547 - PDF;
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5.
The first limit on invisible decays of $B_s$ mesons comes from LEP / Alonso-Álvarez, Gonzalo (McGill U. ; Toronto U.) ; Escudero Abenza, Miguel (CERN)
Motivated by the recent evidence for $B^+\to K^+\bar{\nu} \nu$ decays at Belle II, we point out that fully invisible $B_d$ and $B_s$ meson decays are strongly constrained by LEP. A reinterpretation of an old inclusive ALEPH search for $b$-hadron decays with large missing energy allows us to place the limits $\mathrm{Br}(B_d \rightarrow \mathrm{invisible}) < 1.4\times10^{-4}$ and $\mathrm{Br}(B_s \rightarrow \mathrm{invisible}) < 5.6\times10^{-4}$, both at $90\%$ CL. [...]
arXiv:2310.13043; CERN-TH-2023-193.- 2024-05-31 - 5 p. - Published in : Eur. Phys. J. C 84 (2024) 553 Fulltext: document - PDF; 2310.13043 - PDF;
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6.
<math display="inline"><msub><mi>N</mi><mrow><mi>eff</mi></mrow></msub></math> in the Standard Model at NLO is 3.043 / Cielo, Mattia (INFN, Naples ; Naples U.) ; Escudero, Miguel (CERN) ; Mangano, Gianpiero (INFN, Naples ; Naples U.) ; Pisanti, Ofelia (INFN, Naples ; Naples U.)
The effective number of relativistic neutrino species is a fundamental probe of the early Universe and its measurement represents a key constraint on many scenarios beyond the Standard Model of Particle Physics. In light of this, an accurate prediction of $N_{\rm eff}$ in the Standard Model is of pivotal importance. [...]
arXiv:2306.05460; CERN-TH-2023-103.- 2023-12-13 - 6 p. - Published in : Phys. Rev. D 108 (2023) L121301 Fulltext: 2306.05460 - PDF; Publication - PDF;
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7.
Precision CMB constraints on eV-scale bosons coupled to neutrinos / Sandner, Stefan (Valencia U., IFIC) ; Escudero, Miguel (CERN) ; Witte, Samuel J. (Amsterdam U. ; U. Amsterdam, GRAPPA ; ICC, Barcelona U.)
The cosmic microwave background (CMB) has proven to be an invaluable tool for studying the properties and interactions of neutrinos, providing insight not only into the sum of neutrino masses but also the free streaming nature of neutrinos prior to recombination. The CMB is a particularly powerful probe of new eV-scale bosons interacting with neutrinos, as these particles can thermalize with neutrinos via the inverse decay process, $\nu\bar{\nu} \rightarrow X$, and suppress neutrino free streaming near recombination -- even for couplings as small as $\lambda_\nu \sim \mathcal{O}(10^{-13})$. [...]
arXiv:2305.01692; IFIC/23-13; FTUV-23-0413.0599; CERN-TH-2023-073.- 2023-08-09 - 19 p. - Published in : Eur. Phys. J. C 83 (2023) 709 Fulltext: 2305.01692 - PDF; document - PDF;
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8.
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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9.
Soliton Merger Rates and Enhanced Axion Dark Matter Decay / Du, Xiaolong (Carnegie Inst. Observ. ; UCLA) ; Marsh, David J.E. (King's Coll. London) ; Escudero, Miguel (CERN) ; Benson, Andrew (Carnegie Inst. Observ.) ; Blas, Diego (Barcelona, Autonoma U. ; Barcelona, IFAE) ; Pooni, Charis Kaur (King's Coll. London) ; Fairbairn, Malcolm (King's Coll. London)
Solitons are observed to form in simulations of dark matter (DM) halos consisting of bosonic fields. We use the extended Press-Schechter formalism to compute the mass function of solitons, assuming various forms for the relationship between halo mass and soliton mass. [...]
arXiv:2301.09769; KCL-PH-TH-2023-03; CERN-TH-2023-009.- 2024-02-08 - 18 p. - Published in : Phys. Rev. D 109 (2024) 043019 Fulltext: PDF;
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10.
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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