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Observation of $B_c^+ \to D h^+ h^-$ decays
/ LHCb Collaboration
Searches are presented for $B_{c}^{+} \to D h^+ h^-$ decays, where $D$ is a charmed meson and $h^{\pm}$ is a charged pion or kaon, using $pp$ collision data collected by the LHCb experiment corresponding to an integrated luminosity of $9~\text{fb}^{-1}$. [...]
arXiv:2509.15873 ; LHCb-PAPER-2025-028 ; CERN-EP-2025-177.
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Amplitude analysis of $B^0 \rightarrow \eta_c(1S) K^+ \pi^- $ decays
/ LHCb Collaboration
An amplitude analysis of the $B^0 \rightarrow \eta_c(1S) K^+ \pi^-$ decays with $\eta_c(1S)\rightarrow p\bar{p} $ is performed using a sample corresponding to an integrated luminosity of 9$\text{fb}^{-1}$ of $pp$ collision data collected by the LHCb detector at centre-of-mass energies of $\sqrt{s}=$7, 8 and 13TeV. [...]
arXiv:2509.03133 ; LHCb-PAPER-2025-027 ; CERN-EP-2025-185 ; LHCB-PAPER-2025-027.
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2025 - 32.
Fulltext - Related data file(s) - Fulltext
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Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes
/ Abe, S. (Tokyo U., ICRR) ; Abhir, J. (Zurich, ETH) ; Abhishek, A. (INFN, Pisa ; Siena U.) ; Acciari, V.A. (Barcelona, IFAE) ; Aguasca-Cabot, A. (Barcelona U.) ; Agudo, I. (IAA, Granada) ; Aniello, T. (INAF, Rome) ; Ansoldi, S. (Udine U. ; INFN, Trieste ; ICRA, Rome) ; Antonelli, L.A. (INAF, Rome) ; Engels, A. Arbet (Garching, Max Planck Inst., MPE) et al.
Gamma-ray bursts (GRBs) are the most powerful transient objects in the Universe, and they are a primary target for the MAGIC Collaboration. Recognizing the challenges of observing these elusive objects with Imaging Atmospheric Cherenkov Telescopes (IACTs), we implemented a dedicated observational strategy that included an automated procedure for rapid re-pointing to transient sources. [...]
arXiv:2507.05215.-
2025-08-01 - 15 p.
- Published in : Astron. Astrophys. 700 (2025) A96
Fulltext: document - PDF; 2507.05215 - PDF;
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Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations
/ Abe, K. (Tokai U., Hiratsuka) ; Abe, S. (Tokyo U., ICRR) ; Abhir, J. (Zurich, ETH) ; Abhishek, A. (INFN, Pisa ; Siena U.) ; Acciari, V.A. (Barcelona, IFAE) ; Aguasca-Cabot, A. (Barcelona U.) ; Agudo, I. (Granada U., Theor. Phys. Astrophys.) ; Aniello, T. (INAF, Rome) ; Ansoldi, S. (Udine U. ; INFN, Trieste ; ICRA, Rome) ; Antonelli, L.A. (INAF, Rome) et al.
Mrk 421 was in its most active state around early 2010, which led to the highest TeV gamma-ray flux ever recorded from any active galactic nuclei. We aim to characterize the multiwavelength behavior during this exceptional year for Mrk 421, and evaluate whether it is consistent with the picture derived with data from other less exceptional years. [...]
arXiv:2501.03831.-
2025-02-01 - 21 p.
- Published in : Astron. Astrophys. 694 (2025) A195
Fulltext: document - PDF; 2501.03831 - PDF;
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Cosmic-ray acceleration and escape from supernova remnant W44 as probed by Fermi-LAT and MAGIC
/ Abe, S. (Tokyo U., ICRR) ; Abhir, J. (Zurich, ETH) ; Abhishek, A. (INFN, Pisa ; Siena U.) ; Acciari, V.A. (Laguna U., Tenerife) ; Aguasca-Cabot, A. (Barcelona U.) ; Agudo, I. (IAA, Granada) ; Aniello, T. (INAF, Rome) ; Ansoldi, S. (Udine U. ; INFN, Trieste ; ICRA, Rome) ; Antonelli, L.A. (INAF, Rome) ; Engels, A. Arbet (Garching, Max Planck Inst., MPE) et al.
Context. The supernova remnant (SNR) W44 and its surroundings are a prime target for studying the acceleration of cosmic rays (CRs). [...]
arXiv:2501.03889.-
2025-01-01 - 15 p.
- Published in : Astron. Astrophys. 693 (2025) A255
Fulltext: 2501.03889 - PDF; document - PDF;
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First evidence for direct $CP$ violation in beauty to charmonium decays
/ LHCb Collaboration
The $CP$ asymmetry and branching fraction of the CKM-suppressed decay $B^+ \to J\psi \pi^+$ are precisely measured relative to the favoured decay $B^+ \to J\psi K^+$, using a sample of proton-proton collision data corresponding to an integrated luminosity of $5.4 \ \text{fb}^{-1}$ recorded at center-of-mass energy of $13\ \text{TeV}$ during 2016-2018. The results of the $CP$ asymmetry difference and branching fraction ratio are \begin{align*} \Delta\mathcal{A}^{C\!P} &\equiv \mathcal{A}^{C\!P}({B}^+ \to {J}\mskip -3mu/\mskip -2mu\psi\,\pi^+) - \mathcal{A}^{C\!P}({B}^+ \to {J}\mskip -3mu/\mskip -2mu\psi\,K^+) = (1.29 \pm 0.49 \pm 0.08) \times 10^{-2}, \end{align*} \begin{equation*} \mathcal{R}_{\pi/K} \equiv \frac{\mathcal{B}(B^+ \!\to J\mskip -3mu/\mskip -2mu\psi\,\pi^+)} {\mathcal{B}(B^+ \!\to J\mskip -3mu/\mskip -2mu\psi\,K^+)} = (3.852 \pm 0.022 \pm 0.018) \times 10^{-2}. [...]
arXiv:2411.12178; LHCb-PAPER-2024-031; CERN-EP-2024-286.-
Geneva : CERN, 2025-03-12 - 20 p.
- Published in : Phys. Rev. Lett. 134 (2025) 101801
Fulltext: paper_2024_B2JpsiPi - PDF; 2411.12178 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Constraints on the photon polarisation in $b \to s \gamma$ transitions using $B_s^0\to \phi e^+ e^-$ decays
/ LHCb Collaboration
An angular analysis of the $B_s^0 \rightarrow \phi e^+e^-$ decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of $9\,{\rm fb}^{-1}$ at centre-of-mass energies of 7, 8 and $13\,{\rm TeV}$. The analysis is performed in the very low dielectron invariant mass-squared region between $0.0009$ and $0.2615\,{\rm GeV}^2\!/c^4$. [...]
arXiv:2411.10219; LHCb-PAPER-2024-030; CERN-EP-2024-276.-
Geneva : CERN, 2025-03-07 - 22 p.
- Published in : JHEP 2503 (2025) 047
Fulltext: LHCb-PAPER-2024-030_Arxiv - PDF; 2411.10219 - PDF; document - PDF; LHCb-LHCb-PAPER-2024-030-figures - ZIP; Related data file(s): ZIP; Supplementary information: ZIP;
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Measurement of the effective leptonic weak mixing angle
/ LHCb Collaboration
Using $pp$ collision data at $\sqrt{s}=13$~TeV, recorded by the LHCb experiment between 2016 and 2018 and corresponding to an integrated luminosity of $5.4$~fb$^{-1}$, the forward-backward asymmetry in the $pp \to Z/\gamma^{*} \to \mu^+\mu^-$ process is measured. The measurement is carried out in ten intervals of the difference between the muon pseudorapidities, within a fiducial region covering dimuon masses between $66$ and $116$ GeV, muon pseudorapidities between $2.0$ and $4.5$ and muon transverse momenta above $20$ GeV. [...]
arXiv:2410.02502; LHCb-PAPER-2024-028; CERN-EP-2024-230.-
Geneva : CERN, 2024-12-03 - 28 p.
- Published in : JHEP 2412 (2024) 026
Fulltext: LHCb-PAPER-2024-028 - PDF; 2410.02502 - PDF; document - PDF; Related data file(s): ZIP; Supplementary information: LHCb-PAPER-2024-028-supplementary - ZIP; supplementary (3) - PDF;
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