Recent LHC results ALICE CMS ATLAS. Can we measure, with high accuracy? Achilles’ Heel of ‘inelastic’ measurements : low mass SD,DD Uninstrumented regions:

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Presentation transcript:

Recent LHC results ALICE CMS ATLAS

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

 total = High mass diffractive dissociation = PPP-diagram Low mass diffractive dissociation PPR-diagram R P P PP PP S2S2 S2S2 ~ 1/M 3 ~ 1/M 2 Screening is very important. (semi) enhanced absorption … dual to (t-dependence !? )

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) S.Ostapchenko, ArXiv: ) KMR /67.1 6/7.4 Dino-11 MPS-11 For illustration purposes only KP

(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 mb What about current theoretical uncertainties ? KMR-08 GLMM-08 KP For illustration purposes only

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

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

How Large is Large ?

KKMRZ, arXiv: