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A direct search for the standard model Higgs boson decaying to a pair of charm quarks is presented. Associated production of the Higgs and Z bosons, in the decay mode ZH→ℓ^{+}ℓ^{-}cc[over ¯] is studied. A data set with an integrated luminosity of 36.1 fb^{-1} of pp collisions at sqrt[s]=13TeV recorded by the ATLAS experiment at the LHC is used. The H→cc[over ¯] signature is identified using charm-tagging algorithms. The observed (expected) upper limit on σ(pp→ZH)×B(H→cc[over ¯]) is 2.7 (3.9_{-1.1}^{+2.1}) pb at the 95% confidence level for a Higgs boson mass of 125 GeV, while the standard model value is 26 fb.
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http://dx.doi.org/10.1103/PhysRevLett.120.211802 | DOI Listing |
Phys Rev Lett
August 2025
University of Liverpool, Department of Mathematical Sciences, Liverpool L69 3BX, United Kingdom.
We have determined the fourth-order n_{f} contributions to the two splitting functions governing the evolution of all flavor differences of quark distributions of hadrons in perturbative quantum chromodynamics with n_{f} light flavors. The analytic forms of these functions are presented in both Mellin N space and momentum-fraction x space for a general gauge group. In the small-x limit double logarithms occur, but the small-x rise of both splitting functions is confined to extremely small-x values, x≲10^{-6}.
View Article and Find Full Text PDFJ Clin Med
August 2025
Stanford Neurosurgical Artificial Intelligence and Machine Learning Laboratory, Stanford School of Medicine, Stanford University, Stanford, CA 94305, USA.
: The advancement of artificial intelligence (AI) in neurosurgery is dependent on high quality, large, labeled datasets. Labeled neurosurgical datasets are rare, driven by the high expertise required for labeling neurosurgical data. A comprehensive resource overviewing available datasets for AI in neurosurgery is essential to identify areas for potential model building and areas of needed data construction.
View Article and Find Full Text PDFPhys Rev Lett
June 2025
Karlsruhe Institute of Technology (KIT), Institute for Astroparticle Physics (IAP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
The precision measurement of the tritium β-decay spectrum performed by the KATRIN experiment provides a unique way to search for general neutrino interactions (GNIs). All theoretically allowed GNI terms at dimension 6 involving neutrinos are incorporated into a low-energy effective field theory, and can be identified by specific signatures in the measured tritium β spectrum. In this Letter an effective description of the impact of GNIs on the β spectrum is formulated and the first constraints on the effective GNI parameters are derived based on the 4×10^{6} electrons collected in the second measurement campaign of KATRIN in 2019.
View Article and Find Full Text PDFPhys Rev Lett
June 2025
University of Wuppertal, Department of Physics, 42119 Wuppertal, Germany.
We compute the production rates for two, three, four, and five jets in the hadronic decay of a Higgs boson in its two dominant decay modes to bottom quarks and gluons to third order in the QCD coupling constant. The five-, four-, and three-jet rates are obtained from a next-to-next-to-leading order calculation of Higgs decay to three jets, while the two-jet rate is inferred at next-to-next-to-next-to-leading order from the inclusive decay rate. Our results show distinct differences in the dependence of the jet rates on the jet resolution parameter between the two decay modes, supporting the aim of discriminating different Higgs boson decay channels via classic QCD observables.
View Article and Find Full Text PDFPhys Rev Lett
June 2025
Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India.
We present a minimal cosmological solution to the hierarchy problem. Our model consists of a light pseudoscalar and an extra Higgs doublet in addition to the standard model field content. We consider a landscape of vacua with varying values of the electroweak vacuum expectation value (VEV).
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