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Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the and final states.
Eur Phys J C Part Fields
May 2024
Authors Affiliated with an Institute or an International Laboratory Covered by a Cooperation Agreement with CERN, Geneva, Switzerland.
A search for exotic decays of the Higgs boson () with a mass of 125 to a pair of light pseudoscalars is performed in final states where one pseudoscalar decays to two quarks and the other to a pair of muons or leptons. A data sample of proton-proton collisions at corresponding to an integrated luminosity of 138 recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds.
View Article and Find Full Text PDFRadiative Decay Width of J/ψ→γη_{(2)} from N_{f}=2 Lattice QCD.
Phys Rev Lett
February 2023
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
The large radiative production rate for pseudoscalar mesons in the J/ψ radiative decay remains elusive. We present the first lattice QCD calculation of partial decay width of J/ψ radiatively decaying into η_{(2)}, the SU(2) flavor singlet pseudoscalar meson, which confirms QCD U_{A}(1) anomaly enhancement to the coupling of gluons with flavor singlet pseudoscalar mesons. The lattice simulation is carried out using N_{f}=2 lattice QCD gauge configurations at the pion mass m_{π}≈350  MeV.
View Article and Find Full Text PDFCombined Explanation of the Z→bb[over ¯] Forward-Backward Asymmetry, the Cabibbo Angle Anomaly, and τ→μνν and b→sℓ^{+}ℓ^{-} Data.
Phys Rev Lett
July 2021
Grup de Fisica Teòrica (Departament de Fisica), Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Spain and Institut de Fisica d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra, Barcelona, Spain.
In this Letter, we propose a simple model that can provide a combined explanation of the Z→bb[over ¯] forward-backward asymmetry, the Cabibbo angle anomaly (CAA), τ→μνν and b→sℓ^{+}ℓ^{-} data. This model is obtained by extending the standard model (SM) by two heavy vectorlike 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_{μ}-L_{τ} symmetry. The mixing of the new quarks with the SM ones, after electroweak symmetry breaking, does not only explain Z→bb[over ¯] data, but also generates a lepton flavor universal contribution to b→sℓ^{+}ℓ^{-} transitions.
View Article and Find Full Text PDFSearch for a Dark Leptophilic Scalar in e^{+}e^{-} Collisions.
Phys Rev Lett
October 2020
University of Wisconsin, Madison, Wisconsin 53706, USA.
Many scenarios of physics beyond the standard model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an e^{+}e^{-} collider, such a leptophilic scalar (Ï•_{L}) would be produced predominantly through radiation from a Ï„ lepton.
View Article and Find Full Text PDFEinstein-Podolsky-Rosen Paradox and Quantum Entanglement at Subnucleonic Scales.
Phys Rev Lett
February 2020
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.
In 1935, Einstein, Podolsky, and Rosen (EPR) formulated an apparent paradox of quantum theory [Phys. Rev. 47, 777 (1935)PHRVAO0031-899X10.
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