LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 1 ATLAS and CMS activities Albert De Roeck CERN ECFA/DESY meeting St Malo April 2002

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 2 LHC Prospects New date for first beams/collisions: 1/4/2007 Initial physics run starts in 2007  ~10 fb -1 ( cm -2 s -1 ) Depending on the evolution: fb -1 in 5-6 years ( cm -2 s -1 ) Studies ongoing for cm -2 s -1 (SLHC) –Needs changes in machine and detectors –  ~3000 fb -1 in 3-4 years, i.e. by the end of 2010 or so CMS & ATLAS preparing for first beam in 2007 –Concentrate on hard & software –Main questions are on trigger/DAQ, using gold plated physics channels –Exploring of new physics studies not main activity now Discovery potential has been demonstrated for key processes Planned/existing physics review studies –ATLAS physics TDR exist since 2000, may be redone in 2005 –CMS physics TDR planned for 2005, starting to prepare during 2002

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 3 ATLAS and CMS Plans Common LC/LHC studies –There is interest but not yet much activity (5-10 people/exp for now) –We need to start with a fewspecific questions/studies –(Agree on luminosities etc.) ATLAS: Global fits using masses of measured particles, to scan and constrain the susy space  Expect gain due to sleptons on M 0 Add branching ratio & cross section measurements Will be initially based on the ‘old’ LHC benchmark points CMS: interest to start such activity/using new benchmark points ATLAS & CMS: check on gain of precise measurements of  0 1 (and other gaugino’s) for reconstructing squark masses (mass splitting) CMS: Combining heavy higgs (LHC) with light higgs (LC) measurement

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 4 ATLAS and CMS Plans Benchmark points –ATLAS: so far study of point E (*) (SPS 2 (**) ), maybe B (SPS 1a) next –CMS: point B, C (SPS 3), E and G for trigger studies and reconstruction points I,L (SPS 4) for heavy Higgs to Tau (  point I could be replaced by SPS1b ) –SLHC study: points M, K, H used (no SPS equivalent) –Non-mSUGRA models: take SPS selected points CMS: Combined studies of extra dimensions ? Plan for first results end of June In the following: A reminder of LHC reach, relevant for this group New studies in CMS, e.g. on susy mass reconstruction (*) BDEGMOPW points (**) Snowmass points & slopes

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 5 Example: LSP from LC Impact of the precise knowledge of the LSP from the LC on the neutralino two and slepton masses LSP mass

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 6 CMS Visiting IP5… CMS getting into shape

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 7 Example: The CMS experiment o Tracking o Silicon pixels o Silicon strips o Calorimeters o PbW04 crystals for Electro-magn. o Scintillator/copper for hadronic part o 4T solenoid o Instrumented iron for muon detection o Jet Energy scale to 1.0% o EM energy scale to 0.1% o Luminosity to better than 5%

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 8 Expected Event rates (m=1 TeV) H (m=0.8 TeV) Process Events/s Events/year Other machines W  e LEP / 10 7 Tev Z  ee LEP Tevatron Belle/BaBar QCD jets p T > 200 GeV Huge event rates: The LHC will be a W-factory, a Z-factory, a top factory, a Higgs factory etc..

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 9 SM Higgs search Production and decay modes:

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 10 Expected Results for the Higgs - Will discover the Higgs in the range 100 GeV  1 TeV (if exists) - Precision on the measurement of the mass between 0.1-1%

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 11 H  ZZ (*)  4 leptons clean signal, mass resolution 1% precision on muon momentum comes from combining muon chamber with tracker info

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 12 Light Higgs search If m h < 140 GeV : gg  h   most promising channel, although BR only … motivation for high resolution ECAL (PbWO 4 crystals: 1% at 100 GeV)

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 13 Light Higgs search Recent: h  bb in tth production _ Also results on H  

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 14 H gap -jet  Exclusive Higgs A recent development: search for exclusive Higgs production pp  p H p p p beam p’ dipole roman pots Needs roman pots Cross section ~ 1 fb Khoze et al. roman pots dipole

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 15 Invisible Higgs

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 16 Heavy Higgs Working hard to cover low tan  - high m A region … COVERED at large tan , bb A/H and tb H  production strongly enhanced!! assume M susy = 1 TeV important channels: A/H   A/H   H    H   tb

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 17 Heavy MSSM Higgs search (3) F. Moortgat NEW: at low tan , we may exploit the sparticle decay modes: A, H   2 0  2 0  4l + E T miss

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 18 Susy measurements Atlas physics TDR

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 19 Susy Mostly  complicated decay chains

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 20 Susy Decay chain example

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 21 Susy discovery limits S. Abdoulin

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 22 Susy discovery Limits S. Abdoulin

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 23 Susy measurements Atlas physics TDR: LHC Point 5 m 0 =100 GeV m 1/2 =300 GeV tan  = 2.1 sgn(  )=+ A=300 GeV

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 24 Susy measurements Atlas physics TDR

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 25 Benchmark points

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 26 Benchmark Points

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)  1 0 = LSP 1±1± 145.8lRlR 2±2± 211.4lLlL 2020 549qRqR 3030 570qLqL 40 bRbR 600.5tRtR 522.5bLbL 412.5tLtL 643.3g Study of point B (SPS1) M. Chiorboli

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 28 Decay chain p p b b (15% b L, 10% b R ) (35 % b L, 22% b R ) (0.2 %) (60 %) Event final state:  2 high p t isolated leptons OS  2 high p t b jets missing E t

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 29 First step:  2 0  l + l -  1 0 p p b b Fit result: E t miss > 50 GeV 10 fb -1

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 30 Sbottom reconstruction p p b b Assuming M(  1 0 ) known!

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 31 Sbottom mass Result of fit: Generated masses: 10 fb -1

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 32 Gluino reconstruction p p b b E t miss > 150 GeV

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 33 Gluino mass Result of fit: Generated mass: 10 fb -1

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 34 with 60 fb fb -1 Result of fit: Generated values:

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)  1 0 = LSP 1±1± 193.4lRlR 2±2± 299.6lLlL 2020 780qRqR 3030 814qLqL 40 bRbR 800.8tRtR 723.0bLbL 589.4tLtL 919.8g Point G

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 36 Sbottom peak Result of fit: Generated masses:

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 37 Guino peak Result of fit: Generated mass:

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 38 estimation This needs better understanding of the SM bkg behaviour! Result of fit: Generated values:

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 39 Conclusions Point G, with 60 fb -1 Sbottom and gluino seem to be visible estimation of M(l + l - ) max sbottom reconstruction with Resol. ~ 10 %, but 2 sbottoms not resolved gluino reconstruction with Resol. < 10 % M(g) - M(b) estimation, independent of M(  1 0 ), with Err ~ 4 % Point B, with 10 fb -1 Maybe we can separate the 2 sbottoms Point B, with 60 fb -1

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 40 Stop Searches Stop mass and cross section Missing ET and transverse l mass S/  B for SM and SM+SUSY Channels

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 41 Rare Top Decays S. Slabospitsky decayproduction t  ug t  cg 1.6  (0.3  5.)  (2.1  22.)  tutctutc 2.5    t  uZ t  cZ 1.6    10 -4

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 42 Graviton Searches Traczyk, Wrochna KK excitations in the RS model Search Reach M G =1000 GeV C=0.01 M G =2000 GeV C=0.01

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 43  physics observation: provided efficient measurement of forward scattered protons, one can study high-energy  collisions at the LHC p p Highlights:  CM energy W up to/beyond 1 TeV (and under control) Large photon flux F therefore significant  luminosity Complementary (and clean) physics to pp interactions, eg studies of exclusive production of the Higgs boson, W pairs might be possible opens new field of studying very high energy  physics

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 44 Two-photon interactions at the LHC p p + total  cross section ….

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 45  physics H0H0  pb (at W=M H =200 GeV) SUSY: Higgs: clean signatures: both transversal and longitudinal missing energy ! it cannot be missed!!

LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN) 46 And more… -Precision measurements M W to 15 MeV, M top to 1.5 GeV anomalous gauge couplings, sin 2  W, rare top decays, B-physics, CP violation studies -MSSM Higgs bosons -Extra dimensions -New heavy gauge bosons -Strong interactions in the W sector -Technicolor -Compositeness up to scales of 40 TeV LHC detectors must be prepared for the unknown MSSM Higgs W mass New W boson Top quark mass