1 / 11

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.

damara
Download Presentation

HERA and H1 experiment

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related