A new physical phenomenon in ultra-high energy collisions

Glennys R. Farrar, Jeffrey D. Allen

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We show that combining the published Pierre Auger Observatory measurements of the longitudinal and lateral properties of UHE atmospheric showers, points to an unforeseen change in the nature of particle interactions at ultrahigh energy. A "toy model" of UHE proton-air interactions is presented which provides the first fully consistent description of air shower observations. It demonstrates that the observed energy dependence of the depth-of-shower-maximum distribution may not indicate a transition to a heavier composition, as commonly assumed. While fundamentally phenomenological, the model is based on considerations of how the normal vacuum of QCD might be vaporized and chiral symmetry restored by the extreme energy densities produced in UHE collisions. Whatever its origin, understanding this unexpected phenomenon opens exciting directions in particle physics and may impact Early Universe cosmology.

    Original languageEnglish (US)
    Title of host publicationUHECR 2012 - International Symposium on Future Directions in UHECR Physics
    Volume53
    DOIs
    StatePublished - 2013
    Event2012 International Symposium on Future Directions in Ultra High Energy Cosmic Ray Physics, UHECR 2012 - Geneva, Switzerland
    Duration: Feb 13 2012Feb 16 2012

    Other

    Other2012 International Symposium on Future Directions in Ultra High Energy Cosmic Ray Physics, UHECR 2012
    CountrySwitzerland
    CityGeneva
    Period2/13/122/16/12

    Fingerprint

    showers
    collisions
    cosmic ray showers
    particle interactions
    cosmology
    observatories
    flux density
    universe
    quantum chromodynamics
    vacuum
    physics
    protons
    energy
    air
    symmetry
    interactions

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Farrar, G. R., & Allen, J. D. (2013). A new physical phenomenon in ultra-high energy collisions. In UHECR 2012 - International Symposium on Future Directions in UHECR Physics (Vol. 53). [07007] https://doi.org/10.1051/epjconf/20135307007

    A new physical phenomenon in ultra-high energy collisions. / Farrar, Glennys R.; Allen, Jeffrey D.

    UHECR 2012 - International Symposium on Future Directions in UHECR Physics. Vol. 53 2013. 07007.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Farrar, GR & Allen, JD 2013, A new physical phenomenon in ultra-high energy collisions. in UHECR 2012 - International Symposium on Future Directions in UHECR Physics. vol. 53, 07007, 2012 International Symposium on Future Directions in Ultra High Energy Cosmic Ray Physics, UHECR 2012, Geneva, Switzerland, 2/13/12. https://doi.org/10.1051/epjconf/20135307007
    Farrar GR, Allen JD. A new physical phenomenon in ultra-high energy collisions. In UHECR 2012 - International Symposium on Future Directions in UHECR Physics. Vol. 53. 2013. 07007 https://doi.org/10.1051/epjconf/20135307007
    Farrar, Glennys R. ; Allen, Jeffrey D. / A new physical phenomenon in ultra-high energy collisions. UHECR 2012 - International Symposium on Future Directions in UHECR Physics. Vol. 53 2013.
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