DVCS Analysis Page

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Page maintainer: Caro

Workingpage.jpg This is a working page which will continuously change. The content is not reviewed and is intended for people working on this specific topic.

Introduction

This is page intended for people working in the DVCS group. It compiles useful links to documents and webpages related to the analysis and theory of Deeply Virtual Compton Scattering. Please add missing pieces, or correct wrong information. This page is open for suggestions!

Essentials

Exclusive kinematics and variables for DVCS

Photon energy measured by the calorimeter

Standard cuts for the DVCS analysis without Recoil

  • Which DVCS cuts were applied for all the releases of the years 2008 and 2009 is compiled on the Standard Cuts page.

DVCS with Recoil

Signal and Background

Figure taken from [DVCS-theo-006] . For a beam energy of 27.5 GeV and fixed values of the indicated kinematics. Dashed line: DVCS. Dashed-dotted line: Bethe-Heitler (BH). Solid line: total (sum).
  • Bethe-Heitler, ISR, FSR and Compton peak Reviewed by Andy March 2010. See also this mail thread.
    • The figure shows the differential in-plane cross-section vs. the angle between the virtual and real photons.
    • Positive values of the angle Fehler beim Parsen (Konvertierungsfehler. Der Server („https://wikimedia.org/api/rest_“) hat berichtet: „Cannot get mml. Server problem.“): {\displaystyle \theta _{\gamma ^{*}\gamma }} correspond to azimuthal angle Fehler beim Parsen (MathML mit SVG- oder PNG-Rückgriff (empfohlen für moderne Browser und Barrierefreiheitswerkzeuge): Ungültige Antwort („Math extension cannot connect to Restbase.“) von Server „https://wikimedia.org/api/rest_v1/“:): {\displaystyle \left.\phi=0\right.} , negative values of Fehler beim Parsen (MathML mit SVG- oder PNG-Rückgriff (empfohlen für moderne Browser und Barrierefreiheitswerkzeuge): Ungültige Antwort („Math extension cannot connect to Restbase.“) von Server „https://wikimedia.org/api/rest_v1/“:): {\displaystyle \theta_{\gamma^*\gamma}} to Fehler beim Parsen (MathML mit SVG- oder PNG-Rückgriff (empfohlen für moderne Browser und Barrierefreiheitswerkzeuge): Ungültige Antwort („Math extension cannot connect to Restbase.“) von Server „https://wikimedia.org/api/rest_v1/“:): {\displaystyle \left.\phi=\pi\right.} .
    • The left peak corresponds to the Compton peak where the momentum transferred to the target is minimal: in the DVCS process, the real photon is collinear with the virtual one (Fehler beim Parsen (MathML mit SVG- oder PNG-Rückgriff (empfohlen für moderne Browser und Barrierefreiheitswerkzeuge): Ungültige Antwort („Math extension cannot connect to Restbase.“) von Server „https://wikimedia.org/api/rest_v1/“:): {\displaystyle \overrightarrow{q}} -vector)
    • The middle peak corresponds to initial state radiation (ISR): the real photon is essentially collinear with the incoming beam lepton. (i.e., it points along the front partial track of the lepton.) The tiny opening angle is of order the electron mass divided by its energy. These photons can by no means be detected at Hermes as they go along the beam pipe, lacking calorimeter acceptance.
    • The right peak corresponds to final state radiation (FSR): the real photon is collinear with the scattered beam lepton (i.e., it points along the back partial track of the lepton). With the current software, the hit cluster in the ECal generated by these photons is not written to tape. The reason is that hrc does not recognize clusters having a front partial track pointing to it as trackless clusters. Rather the energy of the cluster is added to that of the track.
    • The kinematic variables defined in the context of DVCS are calculated for every single-photon event. This can be Bethe-Heitler (elastic scattering) or DVCS (deep-inelastic scattering). Only in the latter case, variables like and Fehler beim Parsen (MathML mit SVG- oder PNG-Rückgriff (empfohlen für moderne Browser und Barrierefreiheitswerkzeuge): Ungültige Antwort („Math extension cannot connect to Restbase.“) von Server „https://wikimedia.org/api/rest_v1/“:): {\displaystyle \left.Q^2\right.} are physically meaningful. These quantities are calculated also for BH assuming it is DVCS.

DVCS Monte Carlo

  • Information about Monte-Carlo generators and productions for the DVCS analysis is compiled on the DVCS Monte-Carlo Page.

DVCS systematic studies and model calculations

Mailing List Archive

Dual Model

Dual model: theoretical calculation error found + corrected

Meetings (latest on top)

  • Since February 2011, the exclusive meeting is merged with the weekly analysis meeting on Wednesday, 15:00 HH time.
  • Previous formats

DVCS 2013

DVCS 2012

DVCS 2011

Drafting 2010/2011

  • DC92 (DVCS with Recoil, elastic)
  • DC91 (ALT hydrogen): Release Feb 15; March 3, 14 2011; 1st circulation: March 18, 2011; April 21, 2011; 2nd circulation: May 6, 2011; June 6, 2011.
    • June 17, 2011: submitted to Phys. Lett. B, arXiv:1106.2990, DESY 11-100.
    • September 15, 2011: published Phys. Lett. B 704 (2011) 15-23
  • DC90 (hydrogen 2006-2007 w/o Recoil and 1996-2007): Nov 11,17, Dec 13,16 2010; Jan 14, 27, Feb 3, 18, 28; March 4 2011; 1st circulation: April 4, 2011; May 31, 2011, ... 2nd circulation: September 13, 2011
    • March 29, 2012: submitted to JHEP, arXiv:1203.6287, DESY 12-040
    • July 5, 2012: published JHEP07 (2012) 032

DVCS 2010

Drafting 2009/2010

  • DC81 (deuterium polarized): Sept 14,17; Oct 15; Release: Oct 29 / Dec 14; Nov 6; 1st circulation: Nov 20, 2009; Jan 12,21,27, Feb 4,11,18, March 1,2,3,5,18,22,25, April 7,28 2010; 2nd circulation: May 3, 2010; June 21,23; July 1,5,23 2010
    • Aug 25, 2010: submitted to Nucl. Phys. B, arXiv:1008.3996
    • Oct 20, 2010: published Nucl. Phys. B842 (2011) 265-298
  • DC80 (proton polarized): May 13; June 11; July 9. 1st circulation: Aug 14, 2009; Sept 15; Oct 13,22; Release: Sep 9 / Oct 29; Nov 4; 2nd circulation: Nov 12, 2009; Dec 11,18; Jan 20; Feb 19, March 2, 2010
    • April 2, 2010: submitted to JHEP, arXiv:1004.0177
    • June 10, 2010: published JHEP 06 (2010) 019
  • DC69 (proton unpolarized): March 5,6; April 16; May 12. 1st circulation: May 17, 2009; June 10,11,23,24; July 20; 2nd circulation: July 21, 2009; Aug 19
    • Sep 22, 2009: submitted to JHEP, arXiv:0909.3587, DESY 09-143
    • Nov 19, 2009: published JHEP 11 (2009) 083
  • DC39 (deuterium unpolarized): Jan 26; Feb 16,20; March 4,6; April 1,8. 1st circulation: April 14, 2009; May 27; June 2,8,9,12,15,25,30; July 22,24; 2nd circulation: August 5, 2009; Sept 14,16,18 ,22; Nov 24
    • Nov 3, 2009: submitted to Nucl. Phys. B, arXiv:0911.0095
    • Jan 14, 2010: published Nucl. Phys. B 829 (2010) 1-27
  • DC47 (nuclear): Jan 13; Feb 4,11,17; March 5. 1st circulation: March 9, 2009; May 5,18,26; June 12,16; 2nd circulation: July 10, 2009; Aug 20; Oct 7; Jan 13, 2010
    • Nov 3, 2009: submitted to Phys. Rev. C, arXiv:0911.0091
    • March 8, 2010: published Phys. Rev. C 81 (2010) 035202

DVCS 2009

DVCS 2008

DVCS 2007

DVCS 2006

Literature

Maintained by Caro

General directory for literature that is not on the Hermes webpage: http://www-hermes.desy.de/groups/dvcsgrp/literature/

HERMES Publications

  • rdDVCS 2012
    • JHEP 10 (2012) 042
    • DVCS with recoil, pure sample
  • H-unpol 2012
    • JHEP 07 (2012) 032
    • all hydrogen data 1996-2007, no recoil analysis
  • ALT hydrogen
    • Phys. Lett. B 704 (2011) 15-23
    • all transverse hydrogen data
  • Dpol 2010
    • Nucl. Phys. B842 (2011) 265-298
    • all longitudinal deuterium data
  • Hpol 2010
    • JHEP 06 (2010) 019
    • all longitudinal hydrogen data
  • Nuclear 2010
    • Phys. Rev. C 81 (2010) 035202
    • all nuclear data
  • D-unpol 2009
    • Nucl. Phys. B 829 (2010) 1-27
    • all unpolarized deuterium data
  • H-unpol 2009
    • JHEP 11 (2009) 083
    • all 1996-2005 hydrogen data
  • TTSA 2008
    • JHEP 06 (2008) 066, 24pp
    • all transverse hydrogen data
  • BCA 2006
    • Phys. Rev. D 75 (2007) 011103(R), 5pp.
    • 1996-2000 hydrogen data only
  • BSA 2001
    • Phys. Rev. Lett. 87 (2001) 182001
    • 1996/1997 hydrogen data only

Released and published DVCS plots

Release Reports

Proceedings and Internal Notes

Proceedings often contain the status of the art, as publications take a long time.

Theses

DVCS

Rather Recoil-related

Exclusive Pi-Zero Production

Conference Talks

DVCS measurements by other experiments

Jefferson Lab

Hall A


CLAS
Other Hall C


General

COMPASS

Non-representative list. Input greatly appreciated, especially latest news 2010-2011.

HERA

ZEUS

ZEUS publication page

  • [ZEUS-DVCS-002] A measurement of the Q2, W and t dependences of deeply virtual Compton scattering at HERA, arXiv:0812.2517, JHEP 0905:108 (2009).
    • sigma(t), sigma(W), sigma (Q2); b-slope of various exclusive processes, ZEUS+H1. For subsample, proton detected.
  • [ZEUS-DVCS-001] Measurement of deeply virtual Compton scattering at HERA, arXiv:hep-ex/0305028, Phys. Lett. B573 (2003) 46-62.
    • sigma(W), sigma(Q2), separately for e- (1998-1999) and e+ (1996-2000) data
H1

H1 publication page

  • [H1-DVCS-004] Deeply Virtual Compton Scattering and its Beam Charge Asymmetry in e+- Collisions at HERA, arXiv:0907.5289, Phys.Lett.B681:391-399 (2009).
    • BCA. Most up-to-date b-slopes(Q2) with H1 and ZEUS.
  • [H1-DVCS-003] Measurement of Deeply Virtual Compton Scattering and its t-dependence at HERA, arXiv:0709.4114, Phys.Lett.B659:796-806 (2008).
    • sigma(t), b-slopes.
  • [H1-DVCS-002] Measurement of Deeply Virtual Compton Scattering at HERA, arXiv:hep-ex/0505061, Eur.Phys.J.C44:1-11 (2005).
    • sigma(W), sigma(Q2), sigma(t). Comparison to color dipole models. Comparison to ZEUS.
  • [H1-DVCS-001] Measurement of Deeply Virtual Compton Scattering at HERA, arXiv:hep-ex/0107005, Phys.Lett.B517:47-58(2001).

EIC

  • "Deeply Virtual Compton Scattering at a Proposed High-Luminosity Electron-Ion Collider", E.-C. Aschenauer, S. Fazio, K. Kumericki and D. Mueller, arXiv:1304.0077, submitted to JHep

Global Analysis

Theory

Spin of the Nucleon and Angular Momentum

  • [Spin-theo-001] M. Burkardt, A. Miller and W.-D. Nowak: Spin-polarized high-energy scattering of charged leptons on nucleons arXiv:0812.2208
  • [Spin-theo-002] Xiangdong Ji, Gauge-Invariant Decomposition of Nucleon Spin (27.1.1997) Phys.Rev.Lett 78 4, 610-613
    • The famous Ji relation (sum rule for total angular momentum)
  • [Spin-theo-003] G. R. Goldstein, J. O. G. Hernandez, S. Liuti, Flexible Parametrization of Generalized Parton Distributions from Deeply Virtual Compton Scattering Observables arXiv:1012.3776
  • [Spin-theo-004] S. K. Taneja, K. Kathuria, S. Liuti, G. R. Goldstein, Angular momentum sum rule for spin one hadronic systems arXiv:1101.0581

Hard Exclusive Reactions

Generalized Parton Distributions (GPDs)

Overview
VGG

The original papers on which the VGG code is based:

Reference to fast VGG-type models:

Dual Model
Dieter Müller model
Liuti
  • [DVCS-theo-030] Gary R. Goldstein, J. Osvaldo Gonzalez Hernandez, Simonetta Liuti: Flexible Parametrization of Generalized Parton Distributions from Deeply Virtual Compton Scattering Observables, arXiv:1012.3776, Phys. Rev. D 84, 034007 (2011)
Associated Asymmetry

DVCS asymmetries from resonant production.

Holographic Principle and Hadron Optics
Timelike and spacelike DVCS

Related pages

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