1. В.Бедняков, 13 июня 2007, ЛВЭ JINR participation, achievements, short- and long-term plans The ATLAS Physics Program Diameter 25 m Barrel toroid length 26 m End-cap end-wall chamber span 46 m Overall weight 7000 Tons Bednyakov V.A., HS07

2. В.Бедняков, 13 июня 2007, ЛВЭ Collisions at the LHC Slide by T. Virdee

3. В.Бедняков, 13 июня 2007, ЛВЭ An Aerial View of Point-1 (Across the street from the CERN main entrance)

4. В.Бедняков, 13 июня 2007, ЛВЭ The Underground Cavern at Pit-1 for the ATLAS Detector

5. В.Бедняков, 13 июня 2007, ЛВЭ The proposal on the participation of the JINR team in ATLAS was firstly presented in 1995. The PAC recommended this project for approval on 24 November 1995. Further on status reports on this projects have been regularly (yearly) presented at PAC and JINR Scientific Council meetings. JINR ATLAS History In 1995, 6567 kUSD+140 kHours of workshop were requested, including 4069 kUSD from the JINR budget

6. В.Бедняков, 13 июня 2007, ЛВЭ The ATLAS detector Over the last decade JINR- ATLAS team was deeply involved in designing, construction, tests and assembly of the major systems of ATLAS: Inner Detector Tile Calorimeter Liquid Argon End Cap Calorimeter Muon detector Common Items (Toroid Warm Structure and others) Participation in the Physics Program was always considered as the most important target. Till 2003 this work has been performed mainly in “background” regime, essentially based on individual efforts, promoted with limited resources case-by-case (as well as for software developments and general computing infrastructure of ATLAS).

7. В.Бедняков, 13 июня 2007, ЛВЭ 15 x 12 x 100 x 6000 = 1.08 10 8 CHF ATLAS costs:

8. В.Бедняков, 13 июня 2007, ЛВЭ JINR Workshops on the ATLAS Physics Early 2004 the JINR-ATLAS team management decided to establish a regular framework (series of workshops) to promote physics-oriented activities at home, aimed to:  Open the door for new ideas (also attract new collaborators, interested in future physics at LHC);  Monitoring of ongoing activities and select most promising ones to provide the necessary support, in particular for visiting conferences and dedicated ATLAS meetings;  Enrich “home community” by involving physicists from JINR member countries who have less possibilities in computing and networking, to make JINR-ATLAS resources and experience widely available;  Keep people informed about recent software developments and dedicated computing infrastructure at JINR. Web site: http://www.atlas-jinr.ru/http://www.atlas-jinr.ru/

9. В.Бедняков, 13 июня 2007, ЛВЭ Main ATLAS Physical topics Standard Model Physics Higgs Boson Physics SUSY Physics Exotics Physics Top Quark Physics Heavy Ions Physics B Physics

10. В.Бедняков, 13 июня 2007, ЛВЭ What we are doing JINR ATLAS Physics team

11. В.Бедняков, 13 июня 2007, ЛВЭ SANC Project SANC (Support of Analytical and Numerical Calculations for Experiments at Colliders). http://brg.jinr.ru/http://brg.jinr.ru/ D.Bardin, L.Kalinovskaya, P.Christova, et al (DLNP, JINR), A.Arbuzov, S.Bondarenko (BLTP, JINR). This very ambitious project starts to produce applications (generators, etc) which allow investigations of prospects for observation of the physical phenomena at the LHC with ATLAS detector.

12. В.Бедняков, 13 июня 2007, ЛВЭ SANC

13. В.Бедняков, 13 июня 2007, ЛВЭ SANC, 2007

14. В.Бедняков, 13 июня 2007, ЛВЭ Preparation for very accurate analysis (including loop corrections) of single top quark production in proton- proton collisions at LHC within SANC. Accurate study of reaction pp -> ZZ as background for H -> ZZ decay. Investigation (within SANC) of possibility to apply an accurate Drell-Yan calculations for LHC luminosity monitoring and Parton-Distribution-Function measurements (Group of D.Yu.Bardin). SANC, 2007

15. В.Бедняков, 13 июня 2007, ЛВЭ 15 Search for Higgs boson with mass 115-160 GeV by means of decay H->Z+gamma and Z->2l within ATLAS software APHENA. (Usubov et al). Search for Higgs boson (400-1000 GeV) decaying H->ZZ->lljj and being produced via vector boson fusion (Usubov, Kultchitski, et al). Seach for charged Higgs boson via tau-nu_tau decay (Chelkov, et al.) Higgs boson(s) Search for the SM Higgs boson via decay H→4μ. Full ATLAS simulation, etc. G.Chelkov, I.Boyko, K.Nikolaev, et al Study of associative production of Higgs boson and top-antitop pair.

16. В.Бедняков, 13 июня 2007, ЛВЭ JINR Higgs boson(s)

17. В.Бедняков, 13 июня 2007, ЛВЭ Higgs boson(s) Search for the SM Higgs boson via decay H→4μ. Full ATLAS simulation. G.Chelkov, I.Boyko, K.Nikolaev, et al SIGNAL: At CERN with SANC generator (with 1-loop corrections and quantum effects of final state muon identity, for the 1 st time) 30 000 H→  decays were generated for M H =130, 160 GeV/c 2. For comparison 10 000 H→ 4  decays were generated with PYTHIA. BACKGROUND: With PYTHIA (and ACERMC) generators 30 000 background events for pp→ZZ, pp→Zbb, with 4 final state muons were simulated. Single Z boson coincidence events “Z+Z” were also simulated. Almost all background events (1/3 of all data) were simulated at LIT farm in Dubna, where modern (the latest versions) ATLAS software are installed. Detector simulation and event reconstruction were carried out completely within modern ALTAS software (C++, ATHENA, GEANT-4, AOD, Root). The results were compared with results obtained earlier (with Fortran, ATLSIM, GEANT-3, HBOOK). CERN and Dubna events (signal and background) were developed in the same manner. The CERN and Dubna simulation and analysis gave almost the same results.

18. В.Бедняков, 13 июня 2007, ЛВЭ 130 GeV 160 GeV Reconstructed events Higgs boson, H→4μ

19. В.Бедняков, 13 июня 2007, ЛВЭ Generator SANC predicts higher than PYTHIA number of selected decays H→  (about 10-15%). There are two reasons: a higher selection efficiency and larger predicted width of the decay. Completed Higgs boson, H→4μ The “golden channel” H  4leptons is one of the most promissing for the early discovery. For the light Higgs (120-160 GeV) the signal is low (tens events per year), but the selection efficiency is high and the background is almost zero. The full simulation study shows that H  4μ alone ensures a ~5σ discovery after one year of nominal luminosity.

20. В.Бедняков, 13 июня 2007, ЛВЭ Higgs boson(s) to search for Higgs decay

21. В.Бедняков, 13 июня 2007, ЛВЭ Higgs boson, H→Zγ, etc Search for Higgs boson with mass 115-160 GeV by means of decay H->Z+gamma and Z->2l within ATLAS software APHENA. (Usubov et al). to be completed in 2007

22. В.Бедняков, 13 июня 2007, ЛВЭ Higgs boson(s) 1)Search for Higgs boson with mass 115-160 GeV/c by means of associative production of Higgs and Gauge Bosons ( pp→W(Z)+H+X ) and Higgs decay into bb-pair (H→2b→2b-jets). 2)Study the ATLAS large-mass Higgs discovery potential by means of reactions H→2W→2lν, H→2W→lνjj and H→2Z→2lν, H→2Z→lljj. Proposals rely on the Higgs boson production via the Vector Boson Fusion mechanism (the two accompanying forward jets allow very good background reduction) and on the maximal Higgs decay rates into WW- or ZZ-pair at M=400—1000 GeV. One needs a Higgs Coherence !

23. В.Бедняков, 13 июня 2007, ЛВЭ What IS this Higgs Coherence? Higgs boson main decay channels (in SM and beyond):  H   H  WW*  H   H  4leptons  pp  ttH+X, H  bb,   + Higgs properties (self couplings) … Our potential important task is to check – How the Higgs boson decaying, for example, into 4 muons “shows” itself in the other allowed decays (into 2 photons, bb-pair, etc)? One needs this for the cross-check and the SM EWSB: Is this Higgs the same one, or some another one?

24. В.Бедняков, 13 июня 2007, ЛВЭ 24 Top quark physics Verification of the top-quark charge (is it +2/3 or -4/3 ?): ATLAS will be able to verify top quark charge after analyzing of data taken 1-2 weeks of LHC operation. Search for narrow neutral resonance state (like Z‘ boson) decaying into the top-antitop pairs on the basis of ATLAS top WG data challenge (Khramov, Tonojan. Bednyakov, Rusakovich). Accurate investigation of single top quark production at LHC (in the SANC framework by Bardin et al.) Study of associative production of Higgs boson and top-antitop pair.

25. В.Бедняков, 13 июня 2007, ЛВЭ Top quark physics Verification of the of the top-quark charge (is it +2/3 ?): ATLAS will be able to verify top quark charge after analyzing of data taken 1-2 weeks of LHC operation The work was presented at ATLAS Top WG Meeting (23 March 2006). The article was submitted to ATLAS Notes. Completed

26. В.Бедняков, 13 июня 2007, ЛВЭ Top quark physics 5σ discovery level Completed

27. В.Бедняков, 13 июня 2007, ЛВЭ Higgs boson, pp→Htt, etc Early stage Started search for Higgs boson production together with top-antitop pair pp→Htt (within ATLAS software by Akhmedov, Zorin and Titkova). Higgs boson mass reconstruction via electron-positron pair within EventView software and Root 5.14 was performed.

28. В.Бедняков, 13 июня 2007, ЛВЭ Exotics, Spin-2 gravitons (EDs) CENTER-EDGE ASYMMETRY The search for and identification of the graviton-like Kaluza-Klein states in the lepton-pair production at LHC via new CENTER-EDGE ASYMMETRY was proposed by A.Pankov (Gomel). PYTHIA+ADDThe A_CE allows isolation of spin-2 graviton contribution - - unique graviton exchange signature.

29. В.Бедняков, 13 июня 2007, ЛВЭ Exotics, LFV ATLAS sensitivity is about τ  μμμ 10 -8 for τ  μμμ (better x10 of current limit) τ  μγ 10 -7 for τ  μγ τ  μμμ τ  μγ Study of rare LFV tau decays in ATLAS: τ  μμμ and τ  μγ V.Zhuravlov et al pp  W     nb 19  10 8  pp  Z    nb 3  10 8  pp  BB   D   b 2.4  10 11  Sources of  leptons at LHC 1 year of low luminosity = 10 fb -1

30. В.Бедняков, 13 июня 2007, ЛВЭ Exotics, Monopol Two-photon production and detection of the monopole-antimonopole monopole-antimonopole pairs at LHC Yu. Kurochkin, I.Satsunkevich, D. Shuolkavy, S. Yanush (Minsk), V. Kukhtin, Yu. Kultchitski et al (JINR) Large ionization, like nucleus with Z=70

31. В.Бедняков, 13 июня 2007, ЛВЭ 31 g + g → gluino + gluino 1 pb SIGNATURE: 4 b-jets + 4 muons + E t miss m0 = 1400 GeV m1/2 = 180 GeV A = 0 sign(μ) = +1 tanβ = 30 Pythia within ATHENA, B-vertex taging LARGE! Almost background-less 150 events/year Search for gluinos with ATLAS

32. В.Бедняков, 13 июня 2007, ЛВЭ SUSY, Gluinos

33. В.Бедняков, 13 июня 2007, ЛВЭ 33 SUSY, Gluinos m 1/2 =170 GeVm 1/2 =180 GeVm 1/2 =190 GeV total events883806363043200 di-lepton1057681529 lepton+jets17040123398104 Gluinos can be observed and SUSY parameters can be separated m 1/2

34. В.Бедняков, 13 июня 2007, ЛВЭ SUSY 1. Study (full simulation) of prospects for registration (with ATLAS) the SUSY gluinos (at very specific and very promising EGRET MSSM region) by means of two main gluino decay channels (4b-quarks+4leptons+E_missing and 4b-quarks+2jets+2leptons- E_missing). 2. Search for and investigation of (via fast and full detector simulations) all possible background processes (QCD, qq(gg)->4b+2l+2q, etc) for the above-mentioned SUSY process. Study of influence of relevant miss-tagging of b-jets and muons. 3. Study of prospects of registration of “weak SUSY” processes at the same EGRET MSSM region (complimentary to the above-mentioned gluino production). In these processes one expects, for example, 3leptons+neutrino+E_missing (due to the two lightest neutralinos which escape detection) and one isolated lepton (or jet) accompanied by (very) large missed “transverse” energy (due to W boson decay into neutraino and charghino). Both (gluino and “weak”) investigations are very important for the coherent SUSY search strategy. (E.Khramov, V.Bednyakov, Yu.Budagov, A.Gladyshev, D.Kazakov, J.Khubua, S.Karpov, I.Titkova + students+ CERN colleagues)

35. В.Бедняков, 13 июня 2007, ЛВЭ SUSY Exotics Study of R-hadrons detection possibility with ATLAS Big mass >100 GeV R-hadron -- passive gluino + interacting π/ρ/K/p/n cloud + interacting π/ρ/K/p/n cloud In a nuclear interaction, they may flip charge and baryon number.  High transverse momentum for charged hadrons  Heavy ionization in the tracking system  Missing transverse energy due to large R-hadron mass  “Small” E/p distribution  Large time-of-flight, measurable with the muon chambers and TileCal Signatures: V.Smakova, G.Chelkov, R.Leitner

36. В.Бедняков, 13 июня 2007, ЛВЭ Heavy Ions V.Pozdnyakov+ Full ATLAS simulation of Z 0 -     in pp-,HI production is carried out. Point-like Z 0 production is not influenced by QGP, so the study of jet quenching provided by Z 0. One month HI running gives 5000 Z 0 in the muon mode. The usage of this mode is helpful in study of jet quenching.Back-to-back configuration of Z 0 +jet event is tool for the jet reconstruction. Jet quenching is one of the probe of the Condensed Nuclear Matter (QG-Plasma) ffbar   * /Z 0 Z reconstruction

37. В.Бедняков, 13 июня 2007, ЛВЭ Quark-gluon structure functions The possibilities of measuring at the LHC the gluon distributions in the proton by means of simultaneous registration of the direct photons (Z-bosons) and jets ("gamma/Z+jet" events) Investigation (within SANC) of possibility to apply an accurate Drell-Yan calculations for LHC luminosity monitoring and Parton- Distribution-Function measurements. Development of a new generator for PDFs which obey QCD evolution equations at very low Feynman x and study of their influence on the cross sections of the basic LHC processes (by A.Kotikov, D. and V. Peshekhonov). PDF monitoring via D- or B-meson yields (Lykasov)?

38. В.Бедняков, 13 июня 2007, ЛВЭ Standard Model, Drell-Yan P.Starovoitov et al (Minsk) have considered two-photon mechanism of Drell-Yan lepton pair production in pp-collisions The two-photon contribution is not negligible!

39. В.Бедняков, 13 июня 2007, ЛВЭ 39 Study of Drell-Yan processes in ATLAS Precision calculations of the Drell- Yan process are carried out (SANC project)  From SM Lagrangian to event distributions  Including EW and QCD NLO corrections  Participating in the international group (Les Houche and TEV4LHC workshops At the same time, the experimental study of the process is prepared usinig full ATLAS simulation/reconstruction The results show that already with a decent LHC luminosity the cross- section can be measured with precision about 1% Reconstructed invariant mass of Z→ μμ (1 year of LHC run)

40. В.Бедняков, 13 июня 2007, ЛВЭ Standard Model, applications

41. В.Бедняков, 13 июня 2007, ЛВЭ Some short-term plans Top-quark Physics  Can be done rather quickly  Important test of SM (charge, mass, etc)  Background for SUSY, Exotics, etc  Energy calibration via Z,W and top, etc  Is the Top “the same” in all ”top” observables? Heavy Ions Physics  QGP jet quenching via Z-jet events, γ-γ physics Standard Model Physics  Parton DF verification in 2-jet events, B-mesons  Two-photon Drell-Yan processes  Gamma/Z-jet events and Gluon DF  W, Z – properties, etc

42. В.Бедняков, 13 июня 2007, ЛВЭ Higgs Physics  H→4μ,  H→bb, H→ , H→Z γ, All other Higgs decay channels SUSY Physics  How “the first observed” SUSY-particle shows itself in the other SUSY-channels? (Coherence)  SUSY is background for SUSY  Stop, Gluinos, Same-sign dileptons  Charged Higgs-boson  SUSY Dark Matter Search with ATLAS, etc Exotics Physics  SUSY R-hadrons (Travel ATLAS without decays)  SUSY long-living Staus, Stops, etc  Graviton (Spin=2) via Asymmetry_CE and via resonances  Monopoles, etc  Rare tau-lepton decays Some long-term plans

43. В.Бедняков, 13 июня 2007, ЛВЭ Preparation for the ATLAS data analysis at JINR Since January 2007 JINR site is successfully integrated in the ATLAS DDM (Distributed Data Management system) Training of use of distributed analysis tools (GANGA) is ongoing. Recent versions of ATLAS software are installed at JINR (11.0.41, 12.0.31, 12.0.6, 12.5.0) 19.04.2007 the Tutorial on ATLAS Grid tools and distributed data analysis took place at JINR – the premier in Russian ATLAS Tier-2! Russian and JINR physicists participants of ATLAS experiment train and practise with Grid and the GANGA

44. В.Бедняков, 13 июня 2007, ЛВЭ Conclusions  We have enough attractive ideas in the ATLAS research program.  Some of above proposals (Higgs, Top) have already passed experimental procedure of simulations, background estimates and reconstructions in the ATLAS. With these tools we are ready to meet the first real data from the LHC.  Have ATLAS software installed at JINR  Have GRID and have participated in the Data Generation  Have clear short- and long-term plans  Have contacts with Russian ATLAS community  Have fruitfully working JINR-ATLAS-Physics Workshops and still invite the other Dubna-LHC groups (CMS, ALICE) to join us. Despite of some differences (detector particularities and software used) we all could get a lot of benefit from mutual discussions.  My urgent goals: DATA access, ATLAS soft at JINR, Early Physics