26/07/2002C.Diaconu High Pt Multileptons at HERA 1 Cristinel Diaconu CPP Marseille On behalf of H1 and ZEUS collaboration Lepton pair production in ep.

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Presentation transcript:

26/07/2002C.Diaconu High Pt Multileptons at HERA 1 Cristinel Diaconu CPP Marseille On behalf of H1 and ZEUS collaboration Lepton pair production in ep collisions at HERA

26/07/2002C.Diaconu High Pt Multileptons at HERA 2 Introduction HERA e ± p collider  s= GeV HERA I : H1/ZEUS ~120 pb-1 HERA II 1fb -1 Di-lepton production in e-p collisions possible mainly trough  collisions Spectacular topology Precise SM prediction Interesting phase space for BSM signals (e+p  e - H ++  e-l+l+ see J.Dingfelder talk in BSM) l+ l- E(27.5 GeV) p(920 GeV)

26/07/2002C.Diaconu High Pt Multileptons at HERA 3 Standard Model Processes NC-DIS ep  eX fake 2 nd electron from radiation or mis-id Compton: e  (p)  e+photon(->fake 2 nd e)  elastic  inelastic ee  l + l - (Cabibbo-Parisi) qq  l + l - (Drell-Yan) Fake muons from hadrons (negligible ) +Resonant/HQ production (low PT< 5 GeV) GRAPE (T.Abe et al.) : full diagram a+b+c (EW)+proton structure quasi-elastic  */Z  l + l -

26/07/2002C.Diaconu High Pt Multileptons at HERA 4 LAr,44000 cells em:  (E)=12%/  E Uranium,6500 cells, precise timing, em:  (E)=18%/  E H1 and ZEUS : electron identification Electron identified in calorimeters 5 o <  <175 o (isolated) Central region: –H1 : 20 o <  <150 o –ZEUS: 17 o <  <164 o –calo-tracker redundancy exploited for background rejection: Good quality isolated track required 17 o 164 o 150 o 20 o Electrons ordered in PT: e1,e2,e3  PT1>PT2>PT3

26/07/2002C.Diaconu High Pt Multileptons at HERA 5 Multi-electron selection Two central high PT electrons –H1 : P T (1)>10 GeV P T (2)>5 GeV 20 o <  <150 o –ZEUS: P T (1)>10 GeV E(2)>10 GeV 17 o <  <164 o + any other electron(3 rd ) identified in the calo 5 o <  <175 o H1 115 pb -1 DataSMGrapeNC+Compton 2e ± ± ±5.5 3e ± ±3.00.1±0.0 ZEUS 130 pb -1 DataSMGrapeNC+Compton 2e ± ± ±3.7 3e ±0.5 - Statistical errors Statistical and systematical errors

26/07/2002C.Diaconu High Pt Multileptons at HERA 6 Longitudinal momentum as expected for 2e and 3e –(E-Pz=2*Ee=55 GeV when all particles detected) No high P t miss Inelasticity spectrum well described Inclusive Distribution (H1) z

26/07/2002C.Diaconu High Pt Multileptons at HERA 7 Electron transverse momenta (H1) Steep spectra Good overall description Three 2e GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 8 Electron PT and polar angles (ZEUS) Good overall description PT1>30 GeV 8(Data)/7.1(SM) Two events with PTe1,2>50 GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 9 Mass distribution M 12 Mass of two highest PT electrons in the event H1 Good overall agreement Several events at high mass M 12 >100 GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 10 Multi-electron events at high mass M 12 >100 GeV H1 115 pb -1 DataSMGrapeNC+Compton 2e 30.25± ± ±0.03 3e 30.23± ±0.0 ZEUS 130 pb -1 DataSMGrapeNC+Compton 2e ± ± ±0.07 3e ± Statistical errors Statistical and systematical errors Reminder: H1/ZEUS different polar angle domains

26/07/2002C.Diaconu High Pt Multileptons at HERA 11 Example 2e event (ZEUS) M 12 =134 GeV PT=56 GeV PT=53 GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 12 Example 2e event (H1) M 12 =130GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 13 Example 3e event (H1) M 12 =118 GeV High mass from forward-backward topology

26/07/2002C.Diaconu High Pt Multileptons at HERA 14 H1: Cross section measurement ep  ee + e - X 2e Sample E-Pz<45 GeV, opposite charges Good agreementInelastic process well described P e T (1,2)>10,5 20 o <  <150 o y<0.82 Q 2 <1 GeV 2 Data/MC: 41/48.3±6.1 (1.9BG) + -Q2Q2 z

26/07/2002C.Diaconu High Pt Multileptons at HERA 15 Multi-muon Events PT(  1,2 )>2GeV 20 o <   <160 o L=70pb -1 PT(  1,2 )>5GeV 20 o <   <160 o L=105pb -1 No events at high M12>100 H1: ~1ev expected from e-channel Muons identified in central tracker, mips in Calo and external muon chambers signals

26/07/2002C.Diaconu High Pt Multileptons at HERA 16 M  =80 GeV Example of di-muon event (H1)

26/07/2002C.Diaconu High Pt Multileptons at HERA 17 H1 Di-muon Cross Section Measurement Good agreement with SM Good description of inelasticity spectrum Total Cross-section 46.5±1.3±4.7 pbSM:46.2 Inelastic Cross-Section 20.8±0.9±3.3 pbSM:21.5 PT(  1,2 )>2GeV 20 o <   <160 o

26/07/2002C.Diaconu High Pt Multileptons at HERA 18 Summary Multi-electron and multi-muon production has been measured in ep collision for –PT’s up to 50 GeV –M(ll) up to 100 GeV Good overall agreement is found with the SM calculation. Multi-electron events with M12> 100 GeV observed : –2e : 3/0.25 (H1) 2/0.77 (ZEUS) –3e : 3/0.23 (H1) 0/0.37 (ZEUS) Promising for future investigationPromising for future investigation with 1fb-1 at HERA II with 1fb-1 at HERA II

26/07/2002C.Diaconu High Pt Multileptons at HERA 19 Events at High Mass (H1) The 3 high mass pairs have also high PT The 3 high mass pairs have a bwd-fwd topology

26/07/2002C.Diaconu High Pt Multileptons at HERA 20 Isolated leptons event Not the same topology As high mass di-electrons High PT jet in the events

26/07/2002C.Diaconu High Pt Multileptons at HERA 21 Mass combinations for 3e events No other events with high mass combination

26/07/2002C.Diaconu High Pt Multileptons at HERA 22 High Mass Event (H1) M

26/07/2002C.Diaconu High Pt Multileptons at HERA 23 High Mass Event (H1)

26/07/2002C.Diaconu High Pt Multileptons at HERA 24 High Mass Event (H1)

26/07/2002C.Diaconu High Pt Multileptons at HERA 25 High Mass Event (H1)

26/07/2002C.Diaconu High Pt Multileptons at HERA 26 High Mass Event (H1)

26/07/2002C.Diaconu High Pt Multileptons at HERA 27 High Mass Event (H1)

26/07/2002C.Diaconu High Pt Multileptons at HERA 28 Control Analysis: photon conversions Photon conversions studied with a clean Compton sample: two e.m. clusters and nothing else H1 innner detector tomography with high PT photons Good Description by the simulation, PT under control

26/07/2002C.Diaconu High Pt Multileptons at HERA 29 Fake electrons : control analysis Second e.m. cluster studied in a sample where a good isolated electron already identified Good description of fake electrons: under control Asking for a track greatly reduce the Compton component

26/07/2002C.Diaconu High Pt Multileptons at HERA 30 Tracking efficiency control Track requirement efficiency has been calculated from an inclusive NC-DIS sample

26/07/2002C.Diaconu High Pt Multileptons at HERA 31 High Mass Events (ZEUS) M12=122 GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 32 High Mass Event (ZEUS) M12=94 GeV

26/07/2002C.Diaconu High Pt Multileptons at HERA 33 GRAPE/LPAIR comparison Grape: full EW diagrams Lpair: only  Increase of ~20% Z  ee and  ee contributions LPAIR: Vermaseren calculation based on peripheral diagrams only Grape(“lpair”)/LPAIR Grape/LPAIR

26/07/2002C.Diaconu High Pt Multileptons at HERA 34 H1 multi-e events 2e 3e 2/3 “2e” events have a third electron