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Expectation from early LHC pp collisions: QCD and beyond SM Vladimir Gavrilov ITEP, Moscow November 25, 2009.

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Presentation on theme: "Expectation from early LHC pp collisions: QCD and beyond SM Vladimir Gavrilov ITEP, Moscow November 25, 2009."— Presentation transcript:

1 Expectation from early LHC pp collisions: QCD and beyond SM Vladimir Gavrilov ITEP, Moscow November 25, 2009

2

3 RDMS CMS 25 November 2009 LHC: QCD & BSM 3 Российские институты участвуют в проекте CMS вместе с Объединенным институтом ядерных исследованийи другими странами-участницами ОИЯИ – коллаборация RDMS СМS – ( Russia and Dubna Member State CMS Collaboration), что обеспечивает концентрацию усилий всех участников  ГНЦ Институт Физики Высоких Энергий (ИФВЭ), Протвино  ГНЦ Институт Теоретической и Экспериментальной Физики (ИТЭФ), Москва  Институт Ядерных Исследований РАН (ИЯИ), Троицк  Петербургский Институт Ядерной Физики РАН (ПИЯФ), Гатчина  Московский Государственный Университет (НИИЯФ МГУ), Москва  Физический Институт РАН (ФИАН), Москва  Объединенный Институт Ядерных Исследований (ОИЯИ), Дубна и страны-участницы ОИЯИ

4 CMS detector in experiments hall 25 November 2009 LHC: QCD & BSM 4

5 CMS fully assembled 25 November 2009 LHC: QCD & BSM 5

6 Cosmic muons in CMS 25 November 2009 LHC: QCD & BSM 6 Run CMS continuously to gain operational experience, stability of infrastructure Collected 300M (2008) and 520M (2009) cosmic events More than 99 % of registration channels were operational About 600 TB of data distributed widely The last analyses of these data used software release destined for 2009 data-taking & LHC grid infrastructure Detector and software performances are studied

7 “Splash” events 25 November 2009 LHC: QCD & BSM 7 450 GeV LHC beam hits collimator 150 m in front of CMS

8 Splash event side view 25 November 2009 LHC: QCD & BSM 8

9 900 GeV pp collision event in CMS 25 November 2009 LHC: QCD & BSM 9

10 QCD at LHC 25 November 2009 LHC: QCD & BSM 10 PDF

11 Charged particle multiplicity 25 November 2009 LHC: QCD & BSM 11 Systematics ~10% 0.9 TeV 10 TeV

12 Underlying event 25 November 2009 LHC: QCD & BSM 12

13 Underlying event 25 November 2009 LHC: QCD & BSM 13

14 Inclusive jets 25 November 2009 LHC: QCD & BSM 14

15 PDF knowledge 25 November 2009 LHC: QCD & BSM 15

16 Dijet azimuthal decorrelation 25 November 2009 LHC: QCD & BSM 16

17 Event shapes 25 November 2009 LHC: QCD & BSM 17

18 Jet shapes with charged tracks 25 November 2009 LHC: QCD & BSM 18 tr Second moment of the Jet profile in transverse momentum Main Systematic from JES Sensitive to MC generator Sensitive to q/g jet fractions CMS PAS QCD-08-002 10 TeV, 10pb -1

19 Top quark 25 November 2009 LHC: QCD & BSM 19

20 Top pair final states 25 November 2009 LHC: QCD & BSM 20

21 Lepton + jets mode 25 November 2009 LHC: QCD & BSM 21

22 Dilepton + jets mode 25 November 2009 LHC: QCD & BSM 22

23 Cross section for dilepton decay 25 November 2009 LHC: QCD & BSM 23

24 Experimental New Physics Signatures 25 November 2009 LHC: QCD & BSM 24 Many channels in New Physics :Typical signals Di-leptons resonance/non-resonance, like sign/oposite sign Leptons + MET (=Missing transverse momentum/energy) Photons + MET Multi-jets (2  ~10) Mono/Multi-jets +MET (few 10  few 100 GeV) Multi jets + leptons + MET… B/  final states… Also: new unusual signatures Large displaced vertices Heavy ionizing particles (heavy stable charged particles) Non-pointing photons Special showers in the calorimeters Unexpected jet structures Very short tracks (stubs)…

25 SUSY search strategy 25 November 2009 LHC: QCD & BSM 25

26 SUSY all hadronic modes 25 November 2009 LHC: QCD & BSM 26 3-6 jets

27 SUSY di-lepton modes 25 November 2009 LHC: QCD & BSM 27

28 Discovery reach vs collision energy 25 November 2009 LHC: QCD & BSM 28

29 25 November 2009 Heavy Neutrino CMS discovery potential of the W R boson and right-handed Majorana neutrino for luminosity 30 fb -1, 10 fb -1, 1 fb -1. M(WR) = 1.2 TeV, M(Nl) = 500 GeV can be discovered with 40 pb -1 @ 10 TeV LHC: QCD & BSM

30 Quantum Back Holes 25 November 2009 4-dim., M gravity = M Planck : Schwarzschild radius Black holes decay immediately by Hawking radiation (democratic evaporation) -- large multiplicity -- small missing E -- jets/leptons ~ 5 expected signature (quite spectacular …) 4 + n-dim., M gravity = M D ~ TeV Large partonic cross-section :  (ij  BH) ~  R S 2  (pp  BH) is in the range of 1 nb – 1 fb e.g. For M D ~1 TeV and n=3, produce 1 event/second at the LHC R s  << 10 -35 m R s  ~ 10 -19 m (10 19 GeV) Evaporates in 10 -27 sec Since M D is low, tiny black holes of M BH ~ TeV can be produced if partons ij with  s ij = M BH pass at a distance smaller than R S LHC: QCD & BSM

31 Black Hole Studies 25 November 2009 Already possible to discover with 1 pb -1 !!! However cross sections largely unknown (and challenged) # of jets, leptons and photons Sum of all pt of the objects Luminosity needed LHC: QCD & BSM

32 Summary 25 November 2009 LHC: QCD & BSM 32 Detectors are ready for collisions A lot of QCD studies will be performed in 2010 Many exotic features will be searched for in 2010 More details in other talks: - N.Lychkovskaya (ITEP) - A.Leonidov (FIAN) - R.Ryutin (IHEP) - A.Snigirev (SINP) - S.Shmatov (JINR) - M.Savina (JINR)

33 BACKUP 25 November 2009 LHC: QCD & BSM 33

34 CMS detector 25 November 2009 LHC: QCD & BSM 34

35 ECAL vs HCAL in splash 25 November 2009 LHC: QCD & BSM 35

36 MB: single particle spectra 25 November 2009 LHC: QCD & BSM 36 Diff. yields of identified π ±, K ±, p/p ̅ together with Tsallis-function fits (inverse slope T = 0.2 GeV/c, high P T exponent n = 7.2 chπ Kp Pixel Si-Strip

37 Jet algorithms at LHC 25 November 2009 LHC: QCD & BSM 37

38 Single top 25 November 2009 LHC: QCD & BSM 38

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