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

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

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

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

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

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

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

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

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

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

Underlying event 25 November 2009 LHC: QCD & BSM 12

Underlying event 25 November 2009 LHC: QCD & BSM 13

Inclusive jets 25 November 2009 LHC: QCD & BSM 14

PDF knowledge 25 November 2009 LHC: QCD & BSM 15

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

Event shapes 25 November 2009 LHC: QCD & BSM 17

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 TeV, 10pb -1

Top quark 25 November 2009 LHC: QCD & BSM 19

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

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

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

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

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)…

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

SUSY all hadronic modes 25 November 2009 LHC: QCD & BSM jets

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

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

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 10 TeV LHC: QCD & BSM

Quantum Back Holes 25 November 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

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

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)

BACKUP 25 November 2009 LHC: QCD & BSM 33

CMS detector 25 November 2009 LHC: QCD & BSM 34

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

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

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

Single top 25 November 2009 LHC: QCD & BSM 38