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Recent LHC results

Recent LHC results. ATLAS. CMS. ALICE. Can we measure , with high accuracy?. Achilles’ Heel of ‘inelastic’ measurements : low mass SD,DD. Uninstrumented regions: Totem-CMS :. (at least ). Atlas:. (<15.7 GeV). (Castor). Can we extrapolate from HM SD ?.

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Recent LHC results

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  1. Recent LHC results ATLAS CMS ALICE

  2. Can we measure , with high accuracy? Achilles’ Heel of ‘inelastic’ measurements : low mass SD,DD Uninstrumented regions: Totem-CMS : (at least) Atlas: (<15.7 GeV) (Castor) Can we extrapolate from HM SD ?

  3. stotal = High mass diffractive dissociation ~1/M2 S2 P = P P P Screening is very important. (semi) enhanced absorption … PPP-diagram (t-dependence !? ) Low mass diffractive dissociation R ~1/M3 S2 dual to P P PPR-diagram

  4. Model expectations for total inelastic cross-section Strong dependence of the longitudinal development of air showers on Various MC generators are used by the CR community (some with full resummation of multi-Pomeron graphs)   For illustration purposes only S.Ostapchenko, ArXiv:1103.5684) KMR-11 65.2/67.1 6/7.4 Dino-11 MPS-11 71.6 KP-10

  5. What about current theoretical uncertainties ? KMR-08 For illustration purposes only GLMM-08 KP-10 108 29.5 14.3 (A,B,C) S. Ostapchenko, Phys.Rev.D81:114028,2010. KMR-08: KMR, EPJ C54,199(2008); ibid C60,249 (2009). GLMM-08: GLMM,EPJ C57,689 (2008). KP-10 A.B. Kaidalov, M.Poghosyan Large variation of in the range 5- 10.5 mb

  6. 5. A flavour of diffraction in the first LHC runs. First measurement of at 7 TeV. (arXiv:1104.0326 [hep-ex] , 2 Apr. 2011) / / (model dependence in the definition of )

  7. Can we measure and with a good accuracy ? With known lumi ( 3.5% VdM ) (Lumi independent) ALFA- measurement of elastic scattering in the Coulomb interference region

  8. How Large is Large ?

  9. KKMRZ, arXiv:1005.4839

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