String photini at the LHC

Asimina Arvanitaki, Nathaniel Craig, Savas Dimopoulos, Sergei Dubovsky, John March-Russell

    Research output: Contribution to journalArticlepeer-review


    String theories with topologically complex compactification manifolds suggest the simultaneous presence of many unbroken U(1)'s without any light matter charged under them. The gauge bosons associated with these U(1)'s do not have direct observational consequences. However, in the presence of low energy supersymmetry the gauge fermions associated with these U(1)'s, the "photini," mix with the bino and extend the minimal supersymmetric standard model neutralino sector. This leads to novel signatures at the LHC. The lightest ordinary supersymmetric particle (LOSP) can decay to any one of these photini. In turn, photini may transition into each other, leading to high lepton and jet multiplicities. Both the LOSP decays and interphotini transitions can lead to displaced vertices. When the interphotini decays happen outside the detector, the cascades can result in different photini escaping the detector, leading to multiple reconstructed masses for the invisible particle. If the LOSP is charged, it stops in the detector and decays out of time to photini, with the possibility that the produced final photini vary from event to event. Observation of a plenitude of photini at the LHC would be evidence that we live in a string vacuum with a topologically rich compactification manifold.

    Original languageEnglish (US)
    Article number075018
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Issue number7
    StatePublished - Apr 22 2010

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)


    Dive into the research topics of 'String photini at the LHC'. Together they form a unique fingerprint.

    Cite this