T.Hebbeker LHC. performance, physics, plans. Thomas Hebbeker KET

Transcription

1 LHC performance, physics, plans Thomas Hebbeker KET

2 LHC CMS machine physics experiments RESULTS upgrades 2

3 german contributions! Tevatron (LHC!) Talk M. Feindt top quark 1995 experience guide reference p p 2 TeV L ~ 10/fb per experiment 3

4 LHC machine 4

5 per exp Luminosity 2009: 0.9 TeV c.m. p p ~ 10 / mb 2.36 TeV c.m. p p ~ 0.4 / mb CERN Control Center Nov : 7 TeV c.m. p p ~ 40 / pb 574 TeV c.m. Pb Pb ~ 9 / mb 2011: 7 TeV c.m. p p ~ 5 / fb 574 TeV c.m. Pb Pb (and p Pb) 1/ 9 fb 10 / mb! > 2014: 14 TeV c.m. p p 100 / fb / year 5

6 LHC Luminosity evolution > 5/fb LHCb can cope with 2x higher luminosity than expected! 6

7 LHC records Nominal Beam Energy [TeV] Bunch population p p p Number of bunches (time) (50ns) 2808 (25ns) Transverse beam size IP1&5 [μm] Stored energy [MJ] Peak luminosity [cm -2 s -1 ] Max delivered lumi (1 fill) [pb -1 ] Longest Stable Beams fill [hrs] 12:09 25:59 - Collier , Meyers

8 LHC problems: UFOs On average ~ 6 UFOs/hour during stable beams in the arcs Jul Sep. 2011: 35 fast loss events led to a beam dump ceramic test beam tube Micrometer sized macro-particles are (still) the most plausible explanation. Collier

9 Froideveaux ATLAS High Luminosity - drawbacks Pile-Up. reaching average of 14 / crossing 15 cm trigger thresholds / trigger rate / computing 20 s ellipses single lepton p T thresholds: > 30 GeV (HLT, Atlas+CMS) recording Hz radiation levels in tunnel/caverns/detectors 9

10 2012 Nessi Meyers LHC short term plan s 7 TeV (8 TeV?) / cm 2 / s 10/ fb (?) 50 ns (25 ns) restart data taking March 10

11 Nessi LHC long term plan Phase-0 repair splices

12 James Stirling Hadron Collider Physics: Tevatron versus LHC 2 TeV m( X ) 1TeV : s ( tt,7tev s ( tt,2tev ) ) 25 s ( X,7TeV s ( X,2TeV ) ) 70 12

13 LHC Experiments +TOTEM CMS LHCb ALICE ATLAS 13

14 ATLAS = FSP 101 = A Toroidal LHC ApparatuS Germany = 368 authors = 12.2% = 2nd largest Berlin Bonn Dortmund Dresden Freiburg Gießen Göttingen (Hamburg) Heidelberg Mainz München Siegen Würzburg Wuppertal Collab. Board chair = G. Herten Computing coordinator = H. von der Schmitt MPI München DESY Higgs group convenor = Sandra Kortner 14

15 FSP 102 = CMS = Compact Muon Solenoid Germany = 121 authors = 7.2 % Collab. Board deputy chair = M. Kasemann Top physics convenor = F.P. Schilling Aachen Hamburg Karlsruhe DESY January

16 LHCb = Large Hadron Collider Beauty Experiment Germany = 48 authors = 8.1 % Dortmund Heidelberg Rostock MPI Heidelberg Tracking reconstruction Coordinater =J.v. Tilburg 16

17 At Work! 17

18 Tonelli Detector performance example from CMS %

19 (Grid) Computing example from ATLAS Gianotti Average: ~ jobs/day (~ 15% of total available CPU time) Here only analysis jobs. Most CPU taken by production jobs.

20 Wissing LHC Computing Germany HH LDS Atlas CMS LHCb W GÖ AC Tier 1 Tier 2 FR KA M Talk G. Quast

21 Physics Results 21

22 German contributions! Results 10 examples: hadrons jets b decays b oscillation top W,Z higgs susy W heavy ions 22

23 Hadron production typical minimum bias event 0.9 TeV ECAL HCAL

24 Hadron production in p p 284 events First LHC physics paper best if pileup low Measurements at 0.9, 2.36 and 7 TeV: Rise of multiplicity stronger than anticipated new MC tuning

25 Jet production 25

26 Jet measurements High precision reached early 26

27 13 orders of magnitude Inclusive jet production Jet p T spectrum Agreement with QCD prediction over several orders of magnitude 27

28 LHCb b production and decay B s D s m D K s m K B D tertiary vertex excellent detector performance mm 28

29 Campana LHCb B s μμ 1.1/fb 0.37/fb Standard Model: within reach 2012 SUSY: possible enhancement: BR (95% CL) 29

30 partial width difference B s system properties B s J / J / f 0 mixing phase ~ CPV SM ok! Tevatron results not confirmed In general: so far no Tevatron anomaly seen at LHC

31 Gianotti W and Z production and decay l = e, m millions of Z, W events! s /TeV Perfect agreement with SM 31

32 Top t t bw bw bm be b m b e MET 7 TeV c.m.

33 Top production approaching 1 million tt events jet jet End of 2011: LHC has already produced 15 times more tops than Tevatron! s pb (ATLAS 2010 dileptons) agreement with SM 33

34 Gianotti Summary of weak boson production Inner error: statistical Outer error: total = SM 34

35 Higgs

36 Higgs candidate event CMS 36

37 Standard Model Higgs limits Tevatron LEP High mass region GeV excluded (not accessible by Tevatron) 37

38 ATLAS+CMS Combination: limit on σ/σ SM NEW preliminary High masses GeV excluded (95%) mass range GeV most interesting 38

39 CMS SM Higgs prospects discovery 2012 suspense!!!

40 Supersymmetry? Lightest MSSM higgs ~ SM higgs mass < 135 GeV! higgs limits = strong constraints in SUSY parameter space Excluding MSUGRA does not rule out Supersymmetry!

41 Example: MSUGRA search in jet events no indication for SUSY (yet) 41

42 MSUGRA Limits LEP higgs constraint not shown Limits much stronger than at Tevatron! 42

43 Search for W W excluded up to m = 2.27 TeV (Tevatron limit: 1 TeV) 43

44 Heavy Ions Jet quenching jet suppressed by dense medium (QGP)

45 Gianotti Tonelli Publications and Presentations CMS paper 100 on 3-Aug-2011 ATLAS 45

46 Upgrades Atlas pixel detector 46

47 ATLAS Upgrades Steps for ATLAS upgrade (major German contributions): Phase 0 (2013/14): New: inner pixel layer (IBL), new forward detector level 1 topological calorimeter trigger additional drift tubes in muon system Phase 1 (2018): New: muon chambers, calorimeter & track trigger Phase 2 (~2022): New: completely new Inner Tracker (full silicon: strips & pixel) electronics in calorimeter, muon chambers trigger upgrade From P. Mättig

48 IBL: innermost pixel layer to be installed 2013/14 3,3 cm from IP significant improvement in B - Tagging IBL: Strong German involvement Components produced in German industry/institutes From P. Mättig

49 Muon chambers From P. Mättig German contribution : Aims: reduce occupancy in high intensity environment, prepare for more precise trigger information Technologies: smaller drift tubes (reduce diameter mm) higher bandwidths (opto) - electronics Phase 0: additional drift tubes close acceptance holes Phase I: small wheels close to beam = endcap first layer improve rate capability (also for trigger) Phase II: new read out/trigger electronics replacement of inner chambers improve trigger, bandwidth, radiation hardness

50 Germany CMS Upgrades - up to phase 1 DT muon / trigger system upgrade LS1 2013/14 replacement of pixel detector LS2 ~ 2018 Current Pixel detector: Inefficient at 2 x cm -1 s -1 buffers too short Radiation damage ~200 fb -1 From P. Schleper New Pixel detector 4 layers, smaller radius, Longer buffers, digital R/O, CO 2 cooling, new powering Less material

51 Germany CMS Upgrades - LS1 - phase and LS2 2 new inner tracker new muon trigger LS3 ~ 2022 new tracking: strips - strixel pixel ongoing R&D within CEC consortium Sensor materials and design, radiation & measurement campaign, Build module prototype 2 sensors, e.g. Hybrid correlation for testbeam DC-DC power converter (as for phase-1) Myon track trigger: MTT Szintillators with SiPM R/O, between HO and Muon system From P. Schleper

52 Upgrade Plans LHCb From U. Uwer LHCb upgrade-plans: Luminosity increase for LHCb to >10 33 cm -2 s events / bunch crossing = 5 x design Detector readout at 40 MHz, no Hardware-Trigger. LS2 ~ m Implication for Tracking System Granularity in inner part too low: New Central-Tracker to replace IT and the inner part of OT. New 40 MHz Readout-Electronics for remaining OT modules. Proposed Central Tracker: Scintillating fibers + SiPM (R&D needed to confirm feasibility) 5 m New: Central Tracker German groups would like to contribute to Central Tracker and to 40 MHz readout. Outer Tracker: straw tubes Inner Tracker: Silicon strips 52

53 Summary 53

54 APPENDIX

55 Hadron Collider Physics SM Higgs Supersymmetry xxx 55

56 LHCC, Sep , Paul Collier + update LHC plans 56

57 pp cross section (TOTEM) TOTal cross section, Elastic scattering and diffraction dissociation Measurement at the LHC Optical theorem: s 2 tot ds el d t t 0 57

58 pp cross section (TOTEM) (tracker) s tot ( 7TeV ) ( ) mb (can not be calculated from first principles) 58

59 Higgs candidate event xsection 59

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62 SM Higgs prospects - exclusion LEP 2012 suspense!!! 62