Browsing by Subject "Photon"

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    Effects of extra degrees of freedom on decay rate of metastable topological objects.
    (2010-08) Monin, Alexander
    In present study we consider decays of metastable strings and walls. Both cases of zero and finite temperature are considered. An appropriate interpretation of the thermal result allowed to find the probability of the decay in collisions of Goldstone bosons. The developed technique was used to find the rate of e^+e^- pair production in external field stimulated by photon.
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    A measurement of the isolated photon cross section at CMS with square root of s = 7 TeV
    (2012-09) DeBenedetti, Abraham
    We measure the differential cross section for the inclusive production of isolated prompt photons. This measurement uses data recored by the CMS detector at the LHC in 2010 with proton-proton collisions having a center of mass energy of 7 TeV. The measurement of photon production at the LHC adds to our understanding of the Standard Model and is important for future investigations of new physics. The cross section is compared to the Standard Model with next-to-leading-order perturbative QCD calculations.