Results 41 to 50 of about 27,084,526 (141)

Search for the dark photon in π0 decays

open access: yesPhysics Letters B, 2015
A sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon (A′) production in the π0→γA′ decay followed by the prompt A′→e+e− decay.
J.R. Batley   +120 more
doaj   +1 more source

An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay

open access: yesJournal of High Energy Physics, 2020
The NA62 experiment reports an investigation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ mode from a sample of K + decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024)
The NA62 collaboration   +200 more
doaj   +1 more source

First constraints on the L μ − L τ explanation of the muon g-2 anomaly from NA64-e at CERN

open access: yesJournal of High Energy Physics
The inclusion of an additional U(1) gauge L μ − L τ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light Z′ vector boson, with dominant ...
Yu. M. Andreev   +60 more
doaj   +1 more source

Search for massive colored scalars in four-jet final states in $\sqrt{s}=7~\mbox{TeV}$ proton–proton collisions with the ATLAS detector

open access: yesEuropean Physical Journal C: Particles and Fields, 2011
A search for pair-produced scalar particles decaying to a four-jet final state is presented. The analysis is performed using an integrated luminosity of 34 pb−1 recorded by the ATLAS detector in 2010. No deviation from the Standard Model is observed. For
The ATLAS Collaboration   +3004 more
doaj   +1 more source

A study of the K + → π 0 e + νγ decay

open access: yesJournal of High Energy Physics, 2023
A sample of 1.3 × 105 K + → π 0 e + νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic ...
The NA62 collaboration   +232 more
doaj   +1 more source

Measurement of the isospin asymmetry in B -> K(*) mu+mu- decays [PDF]

open access: yes, 2012
The isospin asymmetries of B → K (∗) μ + μ − decays and the partial branching fractions of B 0 → K 0 μ + μ − and B + → K ∗+ μ + μ − are measured as a function of the di-muon mass squared q 2 using an integrated luminosity of 1.0 fb−1 collected with the ...
van den Brand, J   +999 more
core   +2 more sources

Production of Λ hyperons in 4.0A GeV and 4.5A GeV carbon-nucleus interactions at the Nuclotron

open access: yesJournal of High Energy Physics
The BM@N experiment (Baryonic Matter at the Nuclotron) is the first fixed-target experiment at the JINR NICA accelerator complex. In this work, data on the interactions of a carbon-ion beam with kinetic energies of 4.0A GeV and 4.5A GeV with C, Al, Cu ...
The BM@N collaboration   +210 more
doaj   +1 more source

Technical Design Report of the Spin Physics Detector at NICA: et al. (SPD  Collaboration).

open access: yesNatural Science Review
The Spin Physics Detector Collaboration proposes to install a universal detector in the second interaction point of the NICA collider under construction (JINR, Dubna) to study the spin structure of the proton and deuteron and other spin-related phenomena
V. Abazov   +416 more
doaj   +1 more source

First observation and study of the K± → π±π0e+e− decay

open access: yesPhysics Letters B, 2019
The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003–2004.
J.R. Batley   +122 more
doaj   +1 more source

Searches for lepton number violating K+ → π−(π0)e+e+ decays

open access: yesPhysics Letters B, 2022
Searches for lepton number violating K+→π−e+e+ and K+→π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018.
E. Cortina Gil   +208 more
doaj   +1 more source

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