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CERN Document Server 2,048 records found  1 - 10nextend  jump to record: Search took 0.32 seconds. 
1.
(100)
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. As this phenomenon is highly suppressed in the Standard Model, it could also be a sensitive probe for many new physics scenarios that modify neutral meson mixing. [...]
arXiv:2410.13936; CERN-TH-2024-172.- 2024-12-01 - 29 p. - Published in : Phys. Rev. D 110 (2024) 115033 Fulltext: PDF;
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2.
(91)
Discovering heavy neutrino oscillations in rare $B^\pm_c$ meson decays at HL-LHCb / Tapia, Sebastian (Iowa State U.) ; Vidal-Bravo, Marcelo (Andres Bello Natl. U. ; Unlisted, CL) ; Zamora-Saa, Jilberto (Andres Bello Natl. U. ; Unlisted, CL)
In this work, we study the lepton flavor and lepton number violating $B_{c}$ meson decays via two intermediate on-shell Majorana neutrinos $N_j$ into two charged leptons and a charged pion $B_{c}^{\pm} \to \mu^{\pm} \ N_j \to \mu^{\pm} \tau^{\pm} \pi^{\mp}$. We evaluated the possibility to measure the modulation of the decay width along the detector length produced as a consequence of the lepton flavor violating process, in a scenario where the heavy neutrinos masses range between $2.0$ GeV $\leq M_N \leq 6.0$ GeV. [...]
arXiv:2109.06027.- 2022-02-01 - 15 p. - Published in : Phys. Rev. D 105 (2022) 035003 Fulltext: PhysRevD.105.035003 - PDF; 2109.06027 - PDF;
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3.
(88)
CP violation and determination of the $bs$ "flat" unitarity triangle at FCCee / Aleksan, Roy (IRFU, Saclay) ; Oliver, L. (IJCLab, Orsay) ; Perez, Emmanuel (CERN)
We investigate the sensitivity with which two angles of the "flat" unitarity triangle, defined by $V_{ub}^* V_{us} + V_{cb}^* V_{cs} + V_{tb}^* V_{ts} =0$, can possibly be measured directly at FCCee. We show that the measured errors on the angle $\alpha_s = \arg(- V_{ub}^* V_{us} /V_{tb}^* V_{ts})$ and $\beta_s = \arg(-V_{tb}^* V_{ts} / V_{cb}^* V_{cs})$ should be better than $0.4^\circ$ and $0.035^\circ$, respectively. [...]
arXiv:2107.02002.- 2022-03-01 - 27 p. - Published in : Phys. Rev. D 105 (2022) 053008 Fulltext: PDF; Fulltext from publisher: PDF;
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4.
(86)
Generic Tests of <math display="inline"><mi>C</mi><mi>P</mi></math> Violation in High-<math display="inline"><msub><mi>p</mi><mi>T</mi></msub></math> Multilepton Signals at the LHC and Beyond / Afik, Yoav (CERN) ; Bar-Shalom, Shaouly (Technion) ; Pal, Kuntal (UC, Riverside) ; Soni, Amarjit (Brookhaven) ; Wudka, Jose (UC, Riverside)
We introduce a modification to the standard expression for tree-level CP-violation in scattering processes at the LHC, which is important when the initial state in not self-conjugate. Based on that, we propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals. [...]
arXiv:2212.09433.- 2023-10-23 - 8 p. - Published in : Phys. Rev. Lett. 131 (2023) 171801 Fulltext: 2212.09433 - PDF; Publication - PDF;
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5.
(73)
SU(2)$_R$ and its Axion in Cosmology: A common Origin for Inflation, Cold Sterile Neutrinos, and Baryogenesis / Maleknejad, Azadeh (CERN)
We introduce an axion-inflation model embedded in the Left-Right symmetric extension of the SM in which $W_R$ is coupled to the axion. This model merges three milestones of modern cosmology, i.e., inflation, cold dark matter, and baryon asymmetry. [...]
arXiv:2012.11516; CERN-TH-2020-217.- 2021-10-04 - 10 p. - Published in : Phys. Rev. D 104 (2021) 083518 Fulltext: PDF; Fulltext from publisher: PDF;
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6.
(63)
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;
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7.
(63)
Combined Explanation of the $Z\to b\bar b$ Forward-Backward Asymmetry, the Cabibbo Angle Anomaly, $\tau\to\mu\nu\nu$ and $b\to s\ell^+\ell^-$ Data / Crivellin, Andreas (CERN ; PSI, Villigen ; Zurich U.) ; Manzari, Claudio Andrea (PSI, Villigen ; Zurich U.) ; Alguero, Marcel (Barcelona, Autonoma U. ; Barcelona, IFAE) ; Matias, Joaquim (Barcelona, Autonoma U. ; Barcelona, IFAE)
In this article we propose a simple model which can provide a combined explanation of the $Z\to b\bar b$ forward-backward asymmetry, the Cabibbo Angle Anomaly (CAA), $\tau\to\mu\nu\nu$ and $b\to s\ell^+\ell^-$ data. This model is obtained by extending the Standard Model (SM) by two heavy vector-like quarks (an $SU(2)_L$ doublet (singlet) with hypercharge $-5/6$ (-1/3)), two new scalars (a neutral and a singly charged one) and a gauged $L_\mu-L_\tau$ symmetry. [...]
arXiv:2010.14504; CERN-TH-2020-177; PSI-PR-20-18; UZ-TH 40/20.- 2021-07-02 - 8 p. - Published in : Phys. Rev. Lett. 127 (2021) 011801 Fulltext: PDF; Fulltext from publisher: PDF;
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8.
(57)
$B$ anomalies in the post $R_{K^{(*)}}$ era / Hurth, T. (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; IUF, Paris) ; Neshatpour, S. (IP2I, Lyon ; INFN, Naples)
We discuss the status of $b \to s \ell^+\ell^-$ decays in the post-$R_{K^{(*)}}$ era. The recent LHCb update of $R_K$ and $R_{K^*}$ measurements which are now compatible with the Standard Model, constrain new physics contributions to be lepton flavor universal, allowing only small deviations from this limit. [...]
arXiv:2310.05585; CERN-TH-2023-182; MITP-23-54.- 2023-12-01 - 9 p. - Published in : Phys. Rev. D 108 (2023) 115037 Fulltext: 2310.05585 - PDF; Publication - PDF;
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9.
(56)
Charged and CP-violating kink solutions in the two-Higgs-doublet model / Law, Kai Hong (Manchester U.) ; Pilaftsis, Apostolos (Manchester U. ; CERN)
Minimal extensions of the Standard Model (SM), such as the so-called Two Higgs Doublet Model (2HDM), can possess several accidental discrete symmetries whose spontaneous breakdown in the early universe usually lead to the formation of domain walls. We extend an earlier work [arXiv:2006.13273] on this topic by studying in more detail the analytic properties of electrically charged and CP-violating kink solutions in the $Z_{2}$-symmetric 2HDM. [...]
arXiv:2110.12550; CERN-TH-2021-162.- 2022-03-01 - 23 p. - Published in : Phys. Rev. D 105 (2022) 056007 Fulltext: PhysRevD.105.056007 - PDF; 2110.12550 - PDF;
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10.
(55)
Bell inequality is violated in <math display="inline"><msup><mi>B</mi><mn>0</mn></msup><mo stretchy="false">→</mo><mi>J</mi><mo>/</mo><mi>ψ</mi><msup><mi>K</mi><mo>*</mo></msup><mo stretchy="false">(</mo><mn>892</mn><msup><mo stretchy="false">)</mo><mn>0</mn></msup></math> decays / Fabbrichesi, M. (INFN, Trieste) ; Floreanini, R. (INFN, Trieste) ; Gabrielli, E. (Trieste U. ; INFN, Trieste ; CERN ; NICPB, Tallinn) ; Marzola, L. (NICPB, Tallinn)
The violation of the Bell inequality is one of the hallmarks of quantum mechanics and can be used to rule out local deterministic alternative descriptions. We utilize the data analysis published by the LHCb collaboration on the helicity amplitudes for the decay $B^0\to J/\psi \,K^*(892)^0$ to compute the entanglement among the polarizations of the final vector mesons and the violation of the Bell inequality that it entails. [...]
arXiv:2305.04982.- 2024-02-01 - 5 p. - Published in : Phys. Rev. D 109 (2024) L031104 Fulltext: Publication - PDF; 2305.04982 - PDF;
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