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Luca Stanco - PadovaEW and NP at HERA, Photon 2009 1 EW at HERA Luca Stanco – INFN Padova on behalf of ZEUS and H1 collaborations and RELATED NEW PHYSICS.

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Presentation on theme: "Luca Stanco - PadovaEW and NP at HERA, Photon 2009 1 EW at HERA Luca Stanco – INFN Padova on behalf of ZEUS and H1 collaborations and RELATED NEW PHYSICS."— Presentation transcript:

1 Luca Stanco - PadovaEW and NP at HERA, Photon EW at HERA Luca Stanco – INFN Padova on behalf of ZEUS and H1 collaborations and RELATED NEW PHYSICS - HERA: a QCD and EW machine Results on: - EW constraints - Isolated Leptons - Single TOP

2 Luca Stanco - PadovaEW and NP at HERA, Photon HERA: a collider e-p H1 ZEUS Last Fill the 30 th June fb -1 per exp.: e + p, e - p, LowEnergyRange, MER HERA-II HERA-I

3 Luca Stanco - PadovaEW and NP at HERA, Photon HERA: the QCD machine Gluons and QCD dynamics For Q 2 M 2 Z,M 2 W study also EW interactions: CC double diff. cross-section Beam Polarization QPM Structure Functions

4 Luca Stanco - PadovaEW and NP at HERA, Photon HERA-II feature: Polarization

5 Luca Stanco - PadovaEW and NP at HERA, Photon Q 2 1/ the scale of the interaction corresponds to the spatial resolution at which the proton structure is probed

6 Luca Stanco - PadovaEW and NP at HERA, Photon ElectroWeak unification: status-of-the-art Neutral e-p (ZEUS publ., H1 prel.) Current e+p (ZEUS prel., H1 prel.) Charged e-p (ZEUS publ., H1 prel.) Current e+p (ZEUS prel., H1 prel.) -exchange M 2 Z and M 2 W dominate exhanges ( corrected for the Polarization effects )

7 Luca Stanco - PadovaEW and NP at HERA, Photon NC and Structure Functions: Parity Violation test

8 Luca Stanco - PadovaEW and NP at HERA, Photon Weak Interaction check with Polarization (CC) V-A chiral structure (ZEUS preliminary 2007) WR>208 GeV

9 Luca Stanco - PadovaEW and NP at HERA, Photon Weak Interaction check with Polarization (NC) Asymmetry proportional to vector coupling Parity Violation size, demonstrated down to m

10 Luca Stanco - PadovaEW and NP at HERA, Photon DGLAP fits for QCD-EW: PDFs and uv-quarks couplings - Simultaneous test of the EW and Strong sectors of SM - Best determination of u-coupling to Z - Competitive with Tevatron and LEP results

11 Luca Stanco - PadovaEW and NP at HERA, Photon Isolated high-p T leptons: status-of-the-art Final analysis from H1 and ZEUS on Electron and Muon leptons H1 looked also at the Tau leptons: challenging, large background nice Jacobian peaks, however at hight pT… (combined in progress)

12 Luca Stanco - PadovaEW and NP at HERA, Photon Gerard Brandt at DIS09 H1:

13 Luca Stanco - PadovaEW and NP at HERA, Photon Anomalous Single TOP production at HERA Final results from H1 (HERAII: 474 pb -1 ), HERAI+II in DESY ZEUS preliminary: 277 pb -1 (HERAII), combined with HERAI (120 pb -1 ) Neglet c and Z couplings. Sensitive to u (valence) and anomalous exchange Intrinsic background from SM production of W (lepton decay) Search for signal in muon, electron, hadron channels

14 Luca Stanco - PadovaEW and NP at HERA, Photon No excess limits, H1: < 0.25 pb, k tu < 0.18, ZEUS: < 0.13, k tu < 0.13 (slight excess) Stefano Antonelli at DIS09

15 Luca Stanco - PadovaEW and NP at HERA, Photon Conclusions Many EW checks,Universality, Chiral Structure, Parity Violation Single W production, measured, intriguing signal left at hight p T Anomalous Single TOP production, SM checked (Colliders complementarity) H1 and ZEUS exploit most of HERA DATA for EW studies Unique HERA results done and undergoing BIG thanks to HERA !!

16 Luca Stanco - PadovaEW and NP at HERA, Photon Backup Slides

17 Luca Stanco - PadovaEW and NP at HERA, Photon Chiral Structure of CC, by ZEUS DESY Total cross-section vs Electron Polarization provides striking evidence

18 Luca Stanco - PadovaEW and NP at HERA, Photon Isolated Lepton yield

19 Luca Stanco - PadovaEW and NP at HERA, Photon Single TOP production at HERA in the SM

20 Luca Stanco - PadovaEW and NP at HERA, Photon Single TOP results from H1 Slight excess in the muon and electron channels

21 Luca Stanco - PadovaEW and NP at HERA, Photon Single TOP results from ZEUS Muon channel


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