Floquet time crystals in driven spin systems with all-to-all p -body interactions
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A search for electroweak production of a single vectorlike quark in association with a bottom ( ) quark in the all-hadronic decay channel is presented. This search uses proton-proton collision data at collected by the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of . The quark is assumed to have charge and decay to a top ( ) quark and a Higgs ( ) or boson. Hadronic decays of the quark and the or boson are reconstructed from the kinematic properties of jets, including those containing hadrons. No deviation from the standard model prediction is observed in the reconstructed and invariant mass distributions. The 95% confidence level upper limits on the product of the production cross section and branching fraction of a quark produced in association with a quark and decaying via or range from 1260 to 68 fb for quark masses of 600–1200 GeV. © 2024 CERN, for the CMS Collaboration2024CERNmore » « less
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The production of 𝜂 and 𝜂′ mesons is studied in proton-proton and proton-lead collisions collected with the LHCb detector. Proton-proton collisions are studied at center-of-mass energies of 5.02 and 13TeV and proton-lead collisions are studied at a center-of-mass energy per nucleon of 8.16TeV. The studies are performed in center-of-mass (c.m.) rapidity regions 2.5<𝑦c.m.<3.5 (forward rapidity) and −4.0<𝑦c.m.<−3.0 (backward rapidity) defined relative to the proton beam direction. The 𝜂 and 𝜂′ production cross sections are measured differentially as a function of transverse momentum for 1.5<𝑝T<10GeV and 3<𝑝T<10GeV, respectively. The differential cross sections are used to calculate nuclear modification factors. The nuclear modification factors for 𝜂 and 𝜂′ mesons agree at both forward and backward rapidity, showing no significant evidence of mass dependence. The differential cross sections of 𝜂 mesons are also used to calculate 𝜂/𝜋0 cross-section ratios, which show evidence of a deviation from the world average. These studies offer new constraints on mass-dependent nuclear effects in heavy-ion collisions, as well as 𝜂 and 𝜂′ meson fragmentation.more » « less
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