More Like this

1. First Measurement of νe and νμ Interaction Cross Sections at the LHC with FASER’s Emulsion Detector

   https://doi.org/10.1103/PhysRevLett.133.021802  

   Abraham, Roshan Mammen ; Anders, John ; Antel, Claire ; Ariga, Akitaka ; Ariga, Tomoko ; Atkinson, Jeremy ; Bernlochner, Florian U ; Boeckh, Tobias ; Boyd, Jamie ; Brenner, Lydia ; et al ( July 2024 , Physical Review Letters)

   The first results of the study of high-energy electron neutrino (${\nu }_e$) and muon neutrino (${\nu }_{\mu }$) charged-current interactions in the$\mathrm{FASER}\nu$emulsion-tungsten detector of the FASER experiment at the LHC are presented. A 128.8 kg subset of the$\mathrm{FASER}\nu$volume was analyzed after exposure to$9.5{\mathrm{fb}}^{-1}$of$\sqrt{s}=13.6\mathrm{TeV}$$pp$data. Four (eight)${\nu }_e$(${\nu }_{\mu }$) interaction candidate events are observed with a statistical significance of$5.2\sigma$($5.7\sigma$). This is the first direct observation of${\nu }_e$interactions at a particle collider and includes the highest-energy${\nu }_e$and${\nu }_{\mu }$ever detected from an artificial source. The interaction cross section per nucleon$\sigma /E_{\nu }$is measured over an energy range of 560–1740 GeV (520–1760 GeV) for${\nu }_e$(${\nu }_{\mu }$) to be$({1.2}_{-0.7}^{+0.8})\times {10}^{-38}{\mathrm{cm}}^2{\mathrm{GeV}}^{-1}$[$(0.5\pm 0.2)\times {10}^{-38}{\mathrm{cm}}^2{\mathrm{GeV}}^{-1}$], consistent with standard model predictions. These are the first measurements of neutrino interaction cross sections in those energy ranges.

   Published by the American Physical Society2024 

   more » « less
2. First measurement of the total inelastic cross section of positively charged kaons on argon at energies between 5.0 and 7.5 GeV

   https://doi.org/10.1103/PhysRevD.110.092011  

   Abud, A Abed ; Abi, B ; Acciarri, R ; Acero, M A ; Adames, M R ; Adamov, G ; Adamowski, M ; Adams, D ; Adinolfi, M ; Adriano, C ; et al ( November 2024 , Physical Review D)

   ProtoDUNE Single-Phase (ProtoDUNE-SP) is a 770-ton liquid argon time projection chamber that operated in a hadron test beam at the CERN Neutrino Platform in 2018. We present a measurement of the total inelastic cross section of charged kaons on argon as a function of kaon energy using 6 and$7\mathrm{GeV}/c$beam momentum settings. The flux-weighted average of the extracted inelastic cross section at each beam momentum setting was measured to be$380\pm 26\mathrm{mbarns}$for the$6\mathrm{GeV}/c$setting and$379\pm 35\mathrm{mbarns}$for the$7\mathrm{GeV}/c$setting.

   Published by the American Physical Society2024 

   more » « less
3. Inclusive cross section measurements in final states with and without protons for charged-current νμ -Ar scattering in MicroBooNE

   https://doi.org/10.1103/PhysRevD.110.013006  

   Abratenko, P ; Alterkait, O ; Andrade_Aldana, D ; Arellano, L ; Asaadi, J ; Ashkenazi, A ; Balasubramanian, S ; Baller, B ; Barr, G ; Barrow, D ; et al ( July 2024 , Physical Review D)

   A detailed understanding of inclusive muon neutrino charged-current interactions on argon is crucial to the study of neutrino oscillations in current and future experiments using liquid argon time projection chambers. To that end, we report a comprehensive set of differential cross section measurements for this channel that simultaneously probe the leptonic and hadronic systems by dividing the channel into final states with and without protons. Measurements of the proton kinematics and proton multiplicity of the final state are also presented. For these measurements, we utilize data collected with the MicroBooNE detector from$6.4\times {10}^{20}$protons on target from the Fermilab booster neutrino beam at a mean neutrino energy of approximately 0.8 GeV. We present in detail the cross section extraction procedure, including the unfolding, and model validation that uses data to model comparisons and the conditional constraint formalism to detect mismodeling that may introduce biases to extracted cross sections that are larger than their uncertainties. The validation exposes insufficiencies in the overall model, motivating the inclusion of an additional data-driven reweighting systematic to ensure the accuracy of the unfolding. The extracted results are compared to a number of event generators and their performance is discussed with a focus on the regions of phase space that indicate the greatest need for modeling improvements.

   Published by the American Physical Society2024 

   more » « less
4. Measurement of simplified template cross sections of the Higgs boson produced in association with W or Z bosons in the H→bb¯ decay channel in proton-proton collisions at s=13  TeV

   https://doi.org/10.1103/PhysRevD.109.092011  

   Tumasyan, A ; Adam, W ; Andrejkovic, J W ; Bergauer, T ; Chatterjee, S ; Damanakis, K ; Dragicevic, M ; Escalante_Del_Valle, A ; Hussain, P S ; Jeitler, M ; et al ( May 2024 , Physical Review D)

   Differential cross sections are measured for the standard model Higgs boson produced in association with vector bosons ($W$,$Z$) and decaying to a pair of$b$quarks. Measurements are performed within the framework of the simplified template cross sections. The analysis relies on the leptonic decays of the$W$and$Z$bosons, resulting in final states with 0, 1, or 2 electrons or muons. The Higgs boson candidates are either reconstructed from pairs of resolved$b$-tagged jets, or from single large-radius jets containing the particles arising from two$b$quarks. Proton-proton collision data at$\sqrt{s}=13\mathrm{TeV}$, collected by the CMS experiment in 2016–2018 and corresponding to a total integrated luminosity of$138{\mathrm{fb}}^{-1}$, are analyzed. The inclusive signal strength, defined as the product of the observed production cross section and branching fraction relative to the standard model expectation, combining all analysis categories, is found to be$\mu =1.15_{-0.20}^{+0.22}$. This corresponds to an observed (expected) significance of 6.3 (5.6) standard deviations.