Author: Talanov, V.
Paper Title Page
TUPZ031 Near Beam-gas Backgrounds for LHCb at 3.5 TeV 1876
 
  • D.R. Brett, R. Appleby
    UMAN, Manchester, United Kingdom
  • F. Alessio, G. Corti, R. Jacobsson
    CERN, Geneva, Switzerland
  • M.H. Lieng
    UNIDO, Dortmund, Germany
  • V. Talanov
    IHEP Protvino, Protvino, Moscow Region, Russia
  
  Funding: STFC
We con­sid­er the ma­chine in­duced back­grounds for LHCb aris­ing from col­li­sions of the beam with resid­u­al gas in the long straight sec­tions of the LHC close to the ex­per­i­ment. We con­cen­trate on the back­ground par­ti­cle flux­es ini­ti­at­ed by in­elas­tic beam-gas in­ter­ac­tions with a di­rect line of sight to the ex­per­i­ment, with the po­ten­tial im­pact on the ex­per­i­ment in­creas­ing for larg­er beam cur­rents and chang­ing gas pres­sures. In this paper we cal­cu­late the back­ground rates for pa­ram­e­ters fore­seen with LHC run­ning in 2011, using re­al­is­tic resid­u­al pres­sure pro­files. We also dis­cuss the ef­fect of using a pres­sure pro­file for­mu­lat­ed in terms of equiv­a­lent hy­dro­gen, through weight­ing of other resid­u­al gases by their cross sec­tion, upon the ra­di­al flux­es from the ma­chine and the de­tec­tor re­sponse. We pre­sent the ex­pect­ed rates and the error in­tro­duced through this ap­prox­i­ma­tion.