Experimental particle physics articles within Nature

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  • Article
    | Open Access

    Magnetically confined neutral antihydrogen atoms released in a gravity field were found to fall towards Earth like ordinary matter, in accordance with Einstein’s general theory of relativity.

    • E. K. Anderson
    • , C. J. Baker
    •  & J. S. Wurtele

  • Article |

    A direct search for effective electromagnetic interactions between dark matter and xenon nuclei that produce a recoil of the latter is carried out and the first constraint on charge radius of dark matter is derived.

    • Xuyang Ning
    • , Abdusalam Abdukerim
    •  & Yubo Zhou

  • Article
    | Open Access

    Through machine learning analysis of a large set of collider data, a study disentangles intrinsic from radiatively generated charm, and finds evidence for an intrinsic charm quark within the proton wavefunction.

    • Richard D. Ball
    • , Alessandro Candido
    •  & Juan Rojo

  • Article
    | Open Access

    Stochastic cooling at optical frequencies is demonstrated in an experiment at the Fermi National Accelerator Laboratory’s Integrable Optics Test Accelerator, substantially increasing the bandwidth of stochastic cooling compared with conventional systems.

    • J. Jarvis
    • , V. Lebedev
    •  & A. Valishev

  • Article
    | Open Access

    The CUORE experiment finds no evidence for neutrinoless double beta decay after operating a large cryogenic TeO2 calorimeter stably for several years in an extreme low-radiation environment at a temperature of 10 millikelvin.

    • D. Q. Adams
    • , C. Alduino
    •  & S. Zucchelli

  • Article
    | Open Access

    Relaxation of a perturbed plasma back to its initial state over nanosecond timescales establishes that megahertz repetition rates are supported, and high luminosities and brilliances are in principle attainable with plasma-wakefield accelerator facilities.

    • R. D’Arcy
    • , J. Chappell
    •  & J. Osterhoff

  • Article |

    At the Large Hadron Collider, the MoEDAL experiment shows no evidence for magnetic monopoles generated via the Schwinger mechanism at integer Dirac charges below 3, and suggests a lower mass limit of 75 GeV/c2.

    • B. Acharya
    • , J. Alexandre
    •  & O. Vives

  • Article |

    Multiple high-precision measurement campaigns at CERN of the antiproton-to-proton charge-to-mass ratio—to a precision of 16 parts per trillion—in a cryogenic multi-Penning trap offer no evidence of charge–parity–time violation, and set stringent limits on the clock-weak-equivalence principle.

    • M. J. Borchert
    • , J. A. Devlin
    •  & S. Ulmer

  • Article |

    Electron scattering measurements are shown to reproduce only qualitatively state-of-the-art lepton–nucleus energy reconstruction models, indicating that improvements to these particle-interaction models are required to ensure the accuracy of future high-precision neutrino oscillation experiments.

    • M. Khachatryan
    • , A. Papadopoulou
    •  & S. Gardiner

  • Article
    | Open Access

    The successful laser cooling of trapped antihydrogen, the antimatter atom formed by an antiproton and a positron (anti-electron), is reported.

    • C. J. Baker
    • , W. Bertsche
    •  & J. S. Wurtele

  • Article |

    Quark–antiquark annihilation measurements provide a precise determination of the ratio of down and up antiquarks within protons as a function of momentum, which confirms the asymmetry between the abundance of down and up antiquarks.

    • J. Dove
    • , B. Kerns
    •  & Z. Ye

  • Article |

    A quantum enhanced search for dark matter that uses vacuum squeezing to overcome the quantum noise limit finds no evidence of dark matter axions in a well motivated mass range.

    • K. M. Backes
    • , D. A. Palken
    •  & H. Wang

  • Article
    | Open Access

    Correlations in momentum space between hadrons created by ultrarelativistic proton–proton collisions at the CERN Large Hadron Collider provide insights into the strong interaction, particularly the short-range dynamics of hyperons—baryons that contain strange quarks.

    • S. Acharya
    • , D. Adamová
    •  & N. Zurlo

  • Article |

    The T2K experiment constrains CP symmetry in neutrino oscillations, excluding 46% of possible values of the CP violating parameter at a significance of three standard deviations; this is an important milestone to test CP symmetry conservation in leptons and whether the Universe’s matter–antimatter imbalance originates from leptons.

    • K. Abe
    • , R. Akutsu
    •  & A. Zykova

  • Article |

    Precision measurements of the 1S–2P transition in antihydrogen that take into account the standard Zeeman and hyperfine effects confirm the predictions of quantum electrodynamics.

    • M. Ahmadi
    • , B. X. R. Alves
    •  & J. S. Wurtele

  • Article
    | Open Access

    Ionization cooling, a technique that delivers high-brightness muon beams for the study of phenomena at energy scales beyond those of the Large Hadron Collider, is demonstrated by the Muon Ionization Cooling Experiment.

    • M. Bogomilov
    • , R. Tsenov
    •  & C. Heidt

  • Article |

    A magnetic-spectrometer-free method for electron–proton scattering data reveals a proton charge radius 2.7 standard deviations smaller than the currently accepted value from electron–proton scattering, yet consistent with other recent experiments.

    • W. Xiong
    • , A. Gasparian
    •  & Z. W. Zhao

  • Article |

    In the charge-density-wave Weyl semimetal (TaSe4)2I, an axion is observed and identified as a sliding mode in the charge-density-wave phase characterized by anomalous magnetoelectric transport effects.

    • J. Gooth
    • , B. Bradlyn
    •  & C. Felser

  • Article |

    All components of the proton–proton nuclear fusion chain, in which hydrogen is converted into helium in the Sun, are described, with several implications for fundamental solar and particle physics.

    • M. Agostini
    • , K. Altenmüller
    •  & G. Zuzel

  • Review Article |

    The application and development of machine-learning methods used in experiments at the frontiers of particle physics (such as the Large Hadron Collider) are reviewed, including recent advances based on deep learning.

    • Alexander Radovic
    • , Mike Williams
    •  & Taritree Wongjirad

  • Letter |

    Measurements of the quark pressure distribution in the proton reveal a strong repulsive pressure near the proton’s centre (stronger than the pressure in neutron stars) and a binding pressure at greater distances.

    • V. D. Burkert
    • , L. Elouadrhiri
    •  & F. X. Girod

  • Letter |

    Measurement of the asymmetry in the parity-violating scattering of polarized electrons on protons gives the weak charge of the proton as 0.0719 ± 0.0045, in agreement with the standard model.

    • D. Androić
    • , D. S. Armstrong
    •  & S. Zhamkochyan

  • Review Article |

    The standard model of particle physics is incomplete, but experimental particle decays that occur through a ‘flavour-changing neutral current’ process, which show discrepancies to standard model predictions, may offer hints to the existence of new particles.

    • F. Archilli
    • , M.-O. Bettler
    •  & K. A. Petridis

  • Review Article |

    Recent measurements of B-meson decays in which tau leptons are produced might challenge the standard model assumption that interactions of leptons differ only because of their different masses.

    • Gregory Ciezarek
    • , Manuel Franco Sevilla
    •  & Yutaro Sato

  • Letter |

    The interaction between antiprotons, produced by colliding high-energy gold ions, is shown to be attractive, and two important parameters of this interaction are measured, namely the scattering length and the effective range.

    • L. Adamczyk
    • , J. K. Adkins
    •  & M. Zyzak

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