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HERA and H1 experiment

HERA and H1 experiment. P (920 GeV). H1. e (27.5 GeV). HERA collider: p (920 GeV) x e ± (27.6 GeV), √s = 320 GeV . The world’s only ep Collider, Operational 1992-2007. HERA x-Q 2 kinematic range. Q 2 → up to 3 ∙10 4 GeV 2 x → down to ~10 -5. Large x. Medium x. Low x. 2.

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HERA and H1 experiment

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  1. HERA and H1 experiment P (920 GeV) H1 e (27.5 GeV) HERA collider: p (920 GeV) x e± (27.6 GeV), √s = 320 GeV The world’s only ep Collider, Operational 1992-2007

  2. HERA x-Q2 kinematic range Q2 → up to 3 ∙104 GeV2 x → down to ~10-5 Large x Medium x Low x 2 H1 experiment at HERA

  3. DIS data & parton distributions • Parton distribution functions of quarks and gluons from NLO DGLAP analysis of combined HERA DIS cross sections e±p → e±X 3 H1 experiment at HERA

  4. Diffractive DIS at HERA HERA:~10% of low-x DIS events are diffractive with no color flow between hadron systems Y(p) and X(γ*) • Probe structure of color singlet exchange with virtual photon Standard DIS Diffractive DIS ´ γ* F2D → probe structure of color singlet exchange x Rapidity gap F2 → probe structure of proton H1 experiment at HERA

  5. JINR contribution to H1 Detector • Backward Proportional Chamber BPC • Plug detector • Forward Proton Spectrometer SpaCal FPS 60-90m BPC Plug 5 H1 experiment at HERA

  6. JINR: BPC Chamber & Plug detector Backward Proportional Chamber Plug detector Purpose: selection of diffractive “large rapidity gap” events, suppression of beam-gas background Purpose: measure scattered electron angle, suppress photo-production background  6 U,V,Y planes H1 experiment at HERA 6

  7. Forward Proton Spectrometer JINR, DESY, IfH Zeuthen, Hamburg and Brussels universities: • Purpose: measurement of leading proton momentum using coordinate detectors and system of HERA magnets • Roman Pottechnology, scintillatingfibre detectorsreadout by position sensitive photo-multipliers Horizontal detectors at 61m and 80m: xIP<0.1 HERA-2 (2004-2007): FPS detector upgrade  20 times higher statistics than collected at HERA-1 H1 experiment at HERA 7

  8. HERA II: FPS detector upgrade • New fibre detector technology:  radiation resistant scintillating fibres • Newposition sensitive16/64 channel photo-multipliers • New precision detector positioning and control system H1 experiment at HERA 8

  9. F2D: H1 FPS vs ZEUS LPS Forward Proton Spectrometer data: Q2-dependence in (β,xIP) bins  Reasonable agreement of H1 FPSandZEUS LPSdata in shape & normalisation Combine H1 and ZEUS cross sections to extend phase space and reduce uncertainties

  10. F2D: H1 FPS vs ZEUS LPS • A detailed look to the combined data • First combined results from H1 and ZEUS forward proton spectrometers: •  Consistency between data sets •  Two experiments calibrate each other resulting in reduction of systematic uncertainties • Total uncertainty in most precise points ~6%, normalisation uncertainty ~4% H1 experiment at HERA

  11. F2D and diffractive dijet cross sections: diffractive parton distributions • Diffractive quark singlet and gluon PDFs from combined NLO DGLAP fit of F2D and diffractive dijet cross sections Gluon contribution to diffractive exchange: ~70% H1 experiment at HERA 11

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