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Recent LHC Results: Can We Measure Inelastic Events with High Accuracy?

Explore recent LHC results on inelastic measurements, including low mass diffractive dissociation, uninstrumented regions, and extrapolation from high mass SD. Learn about theoretical uncertainties, model expectations, and the impact of screening in measurements. Discover the importance of longitudinal development in air showers and various MC generators used by the CR community.

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Recent LHC Results: Can We Measure Inelastic Events with High Accuracy?

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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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