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Jet-Quenching in pp collisions at LHC

Jet-Quenching in pp collisions at LHC. Quark Matter Studies by PrET ( Pr oton- E xpansion- T omography) at LHC pp in collisions. Budapest – Purdue Common Project. L. Gutay, K. Krajczar, F. Sikler, G. Veres and G. Vesztergombi. Bodrum, Turkey September 2010. OUTLINES.

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Jet-Quenching in pp collisions at LHC

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  1. Jet-Quenching in pp collisions at LHC Quark Matter Studies by PrET (Proton-Expansion-Tomography) at LHC pp in collisions Budapest – Purdue Common Project L. Gutay, K. Krajczar, F. Sikler, G. Veres and G. Vesztergombi Bodrum, Turkey September 2010

  2. OUTLINES First QGP in pp in 1982 RHIC Heavy Ion QGP signature: jet quenching ( Low-pt diagnostic with high-pt jets) LHC QGP in pp : spacetime structure - jet tomography Experimental FACTS ( CERN SppS and E735 and LHC) Naive „dressed” quark-model for multiple interactions in pp Proposed QGP and DM related signatures in pp at LHC

  3. Flattening effect in E735

  4. KNO-scaling as function of C.M. energy New components are emerging at higher energies in E735 Subtracting lower energy KNO-curve, new KNO appears 3 components at highest energies

  5. Bose-Einstein interference versus multiplicity Higher multiplicity means higher source radii both at E735 and CMS Remark: Quark Matter is observed in larger expanding volumes in correlation with the violance of the collision.

  6. CMS 2.36 TeV

  7. Naive „dressed” quark-model

  8. Heavy quarks are created by exciting the mini glue-ball Resonance states without flavour change are produced by exciting soft gluons (u or d )

  9. SOFT COLLISIONS s2 s3 s1 Not measured yet Secondary KNO-scaling Primary KNO-scaling

  10. HARD + SOFT COLLISIONS S1 hard S2 hard S3hard The aim of this study is to identify these processes

  11. David Enterria 2005 Orsay-Paris

  12. HARD + SOFT COLLISIONS Single soft + hard Double soft + hard ETnear ETnear ETaway (single soft) ETaway (double soft) << Away jet must traverse more excited Quark Matter in case of double soft interaction Transversal view

  13. „Jet physics” at heavy ions: Single inclusive high pT spectra IN pp INTERACTIONS both TRACK and JET metods are possible!!!

  14. Near and away jet ratios as function of multiplicity Prediction: Zaway = ETaway/ETnear Zaway Zaway ETnear ETnear High multiplicity events Low multiplicity events From the energy loss difference one can determine the nature of traversed medium One expects similar results if highest pT tracks are used instead of jets

  15. Compare near-away correlations at different multiplicities in LHC pp One expects that higher multiplicity will have similar effect as larger nucleus size

  16. Search for DARK MATTER fromQGP

  17. DARK MATTER (DM) versus QGP IF at Big-Bang the Dark Matter was produced during the hadronization THEN at LHC Dark Matter will be produced at QGP cooling=hadronization ONE SHOULD look for METs as function of multiplicity: Higher multiplicity could mean larger QGP volume!!!!

  18. The relatively small volume of QGP created in pp is important for MET observability!!! Hadrons DM(s) MET In large volume one expects many DM particles per event averaging out MET. In small volume there is higher probability that 1-2 DM (black-hole or pair of SUSY) particle generated with high MET.

  19. SUMMARY One expects jet quenching measured in near-away jet-jet and track-track correlations due to change of QGP volume implied by multiplicity dependence Missing ET can indicate dark matter

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