QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, 2007 - 1 Results from ZEUS and H1 Tom Danielson University of Wisconsin.

Slides:

Advertisements

Similar presentations

Low x meeting, Sinai Alice Valkárová on behalf of H1 collaboration LOW x meeting 2005, Sinaia H1 measurements of the structure of diffraction.

Advertisements

The Hadronic Final State at HERA Rainer Mankel DESY for the ZEUS & H1 collaborations C2CR Conference Prague 9-Sep Sep-2005 (Some Highlights from)

May 2005CTEQ Summer School1 Global Analysis of QCD and Parton Distribution Functions Dan Stump Department of Physics and Astronomy Michigan State University.

ISDM 2005, Kromeriz Kamil Sedlak, Jets in photoproduction at HERA 1 Jets in Photoproduction & at low Q 2 at HERA On behalf of the H1 and ZEUS Collaborations.

1 Pierre Marage Univ. Libre de Bruxelles On behalf of the H1 and ZEUS collaborations Diffraction at HERA CIPANP 2006 Puerto-Rico 29/5-4/6/2006.

Forward Jet Production at HERA, Patrick Ryan, Univ. of Wisconsin EPS2005, July 21, Patrick Ryan University of Wisconsin On Behalf of the H1 and.

QCD Studies at HERA Ian C. Brock Bonn University representing the ZEUS and H1 Collaborations.

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, QCD Results at CDF Inclusive Jet Cross Section Dijet Mass.

25 th of October 2007Meeting on Diffraction and Forward Physics at HERA and the LHC, Antwerpen 1 Factorization breaking in diffraction at HERA? Alice Valkárová.

Ursula Bassler, LPNHE-Paris, RUN II MC workshop 1 Monte Carlo Tuning: The HERA Experience Monte Carlo Models for DIS events Description of inclusive hadronic.

Erik MaddoxBEACH 2004, Chicago1 Heavy flavour production at HERA Outline: Introduction Charm production Beauty production Conclusions Erik Maddox (NIKHEF/UvA)

M.KapishinDiffraction using Proton Spectrometers at HERA 1 Results on Diffraction using Proton Spectrometers at HERA Low-x Meeting: Paphos, Cyprus, June.

Measurement of Inclusive Jet cross section Miroslav Kop á l University of Oklahoma on behalf of the D Ø collaboration DIS 2004, Štrbské pleso, Slovakia.

R.Carlin 2006 Aspen Winter Conference HERA for LHC Roberto Carlin University of Padova and INFN-PD.

Moriond 2001Jets at the TeVatron1 QCD: Approaching True Precision or, Latest Jet Results from the TeVatron Experimental Details SubJets and Event Quantities.

High E T Jet Physics at HERA José Repond Argonne National Laboratory On behalf of the H1 and ZEUS collaborations Small-x Workshop, Fermilab, March 28-30,

M.KapishinDiffraction and precise QCD measurements at HERA 1 Rencontres de Moriond QCD 2012 M.Kapishin, JINR on behalf of the H1 and ZEUS Collaborations.

Inclusive Jets in ep Interactions at HERA, Mónica V á zquez Acosta (UAM) HEP 2003 Europhysics Conference in Aachen, July 19, Mónica Luisa Vázquez.

W/Z PRODUCTION AND PROPERTIES Anton Kapliy (University of Chicago) on behalf of the ATLAS collaboration PHENO-2012.

PIC 2001 Michael Strauss The University of Oklahoma Recent Results on Jet Physics and  s XXI Physics in Collision Conference Seoul, Korea June 28, 2001.

Luca Stanco - PadovaQCD at HERA, LISHEP pQCD  JETS Luca Stanco – INFN Padova LISHEP 2006 Workshop Rio de Janeiro, April 3-7, 2006 on behalf of.

Experimental Tests of the BFKL Mechanism Zarah Casilum State University of New York at Stony Brook for the D0 Collaboration 1997 Joint April APS/AAPT Meeting.

Dijets at low Bjorken-x, Tom Danielson, U. WisconsinWisconsin Group Meeting, 5 August 2004 Tom Danielson University of Wisconsin An Investigation of the.

T. Schörner-Sadenius: Jets at HERA JETS IN ep AND γp INTERACTIONS AT HERA Thomas Schörner-Sadenius Hamburg University Photon 2005, Warsaw.

Working Group C: Hadronic Final States David Milstead The University of Liverpool Review of Experiments 27 experiment and 11 theory contributions.

1 Jets in diffraction and factorization at HERA Alice Valkárová Charles University, Prague On behalf of H1 and ZEUS collaborations.

16/04/2004 DIS2004 WGD1 Jet cross sections in D * photoproduction at ZEUS Takanori Kohno (University of Oxford) on behalf of the ZEUS Collaboration XII.

V. Chiochia DIS 2003 Workshop Production of beauty quarks in deep inelastic scattering at HERA XI International Workshop on Deep Inelastic Scattering St.

T. Schörner-Sadenius: Jets at HERA JETS IN ep AND γp INTERACTIONS AT HERA Thomas Schörner-Sadenius Hamburg University Photon 2005, Warsaw.

R-ECFA, Prague, March 9, Czech participation in the H1 experiment J. Žáček, Institute of Particle and Nuclear Physics, Charles University in Prague.

NEW RESULTS FROM JET PHYSICS AT HERA Thomas Schörner-Sadenius Hamburg University 2 nd HERA-LHC Workshop June 2006.

DIJET (and inclusive-jet) CROSS SECTIONS IN DIS AT HERA T. Schörner-Sadenius (for the ZEUS collaboration) Hamburg University DIS 06, April 2006 Tsukuba,

LISHEP Rio de Janeiro1 Factorization in diffraction Alice Valkárová Charles University, Prague On behalf of H1 and ZEUS collaborations.

7 th April 2003PHOTON 2003, Frascati1 Photon structure as revealed in ep collisions Alice Valkárová Institute of Particle and Nuclear Physics Charles University.

Inclusive Diffraction at HERA Marcella Capua – INFN and Calabria University Small X and Diffraction FNAL Chicago (USA) 17 – 20 September 2003 on behalf.

David Milstead – Experimental Tests of QCD ITEP06 Winter School, Moscow Experimental Tests of QCD at Colliders: Part 1 David Milstead Stockholm University.

DIS Conference, Madison WI, 28 th April 2005Jeff Standage, York University Theoretical Motivations DIS Cross Sections and pQCD The Breit Frame Physics.

B. Naroska Un. Hamburg Beauty at HERA HEP05 Lisbon 21/07/ Beauty Production at HERA HEP05 International Europhysics Conference on High Energy Physics.

Hard QCD and heavy flavour production at HERA (on behalf of H1 and ZEUS) A. Rostovtsev Charm production Multijet production Running α s and quark masses.

Hadron Structure 2009 Factorisation in diffraction Alice Valkárová Charles University, Prague Representing H1 and ZEUS experiments Hadron structure.

Event Shapes, Alexander Savin University of WisconsinDIS 2006, April 21, Event Shapes in NC DIS at ZEUS Alexander A. Savin University of Wisconsin.

Isabell-A. Melzer-Pellmann Photon 2005, Diffractive interactions in ep collisions Diffractive interactions in ep collisions Isabell-Alissandra.

1 Diffractive dijets at HERA Alice Valkárová Charles University, Prague Representing H1 and ZEUS experiments.

Jets and α S in DIS Maxime GOUZEVITCH Laboratoire Leprince-Ringuet Ecole Polytechnique – CNRS/IN2P3, France On behalf of the collaboration On behalf of.

DIJET (and inclusive-jet) CROSS SECTIONS IN DIS AT HERA T. Schörner-Sadenius (for the ZEUS collaboration) Hamburg University DIS 06, April 2006 Tsukuba,

Overview of low-x and diffraction at HERA Henri Kowalski DESY Rencontres de Moriond La Thuile, March 2006.

K 0 S and  production at ZEUS, A. Savin, University of Wisconsin DIS 2006, April 22, K 0 S and  production at ZEUS Alexander A. Savin University.

Some recent QCD results at the Tevatron N. B. Skachkov (JINR, Dubna)

Jet Studies at CDF Anwar Ahmad Bhatti The Rockefeller University CDF Collaboration DIS03 St. Petersburg Russia April 24,2003 Inclusive Jet Cross Section.

Isabell-A. Melzer-Pellmann DIS 2007 Charm production in diffractive DIS and PHP at ZEUS Charm production in diffractive DIS and PHP at ZEUS Isabell-Alissandra.

1 Heavy Flavour Content of the Proton Motivation Experimental Techniques charm and beauty cross sections in DIS for the H1 & ZEUS Collaborations Paul Thompson.

Charged Particle Multiplicity, Michele Rosin U. WisconsinQCD Meeting May 13, M. Rosin, D. Kçira, and A. Savin University of Wisconsin L. Shcheglova.

1 Forward Jet/  0 Production in DIS at HERA On behalf of the H1 and ZEUS Collaborations ICHEP August 2004, Beijing Didar Dobur, University of Freiburg.

A. Bertolin on behalf of the H1 and ZEUS collaborations Charm (and beauty) production in DIS at HERA (Sezione di Padova) Outline: HERA, H1 and ZEUS heavy.

Costas Foudas, Imperial College, Jet Production at High Transverse Energies at HERA Underline: Costas Foudas Imperial College

Recent QCD Measurements at the Tevatron Mike Strauss The University of Oklahoma The Oklahoma Center for High Energy Physics for the CDF and DØ Collaborations.

Wesley Smith, U. Wisconsin, March 3, 2008 University of Chicago, QCD Results from HERA - 1 QCD results from HERA Wesley H. Smith U. Wisconsin - Madison.

Luca Stanco - PadovaLow-x at HERA, Small-x Low-x AND Low Q 2 Luca Stanco – INFN Padova Small-x and Diffraction 2007 Workshop FermiLab, March 28-30,

QCD Prospects for ATLAS Rainer Stamen Universität Mainz On behalf of the ATLAS collaboration QCD 06 Montpellier, July 3rd 2006.

Moriond 2001Jets at the TeVatron1 QCD: Approaching True Precision or, Latest Jet Results from the TeVatron Experimental Details SubJets and Event Quantities.

1 Proton Structure Functions and HERA QCD Fit HERA+Experiments F 2 Charged Current+xF 3 HERA QCD Fit for the H1 and ZEUS Collaborations Andrew Mehta (Liverpool.

Inclusive jet photoproduction at HERA B.Andrieu (LPNHE, Paris) On behalf of the collaboration Outline: Introduction & motivation QCD calculations and Monte.

Small-x Physics and Diffraction: HERA Results

Open Heavy Flavour Production at HERA

Diffraction in ep collisions

DIS 2004 XII International Workshop

HERA-LHC Workshop, DESY, 22th March 2005

Heavy Flavour Content of the Proton

Outline of the talk: ● Introduction ● QCD models

Trijets in Neutral Current Deep Inelastic Scattering

Presentation transcript:

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Results from ZEUS and H1 Tom Danielson University of Wisconsin – Madison on behalf of the ZEUS and H1 collaborations Dijet and Trijet Correlations Inclusive Forward Jet Production Rencontres de Moriond: March , Italy QCD Dynamics at Low-x Bj in ep Collisions at HERA

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Testing Parton Evolution: Jets at low x Bj Moving to LHC: Are extracted PDFs usable in the LHC kinematic range (1 > x > ) ? Does DGLAP evolution work sufficiently to extrapolate? Study QCD evolution schemes with jets at low x Bj at HERA Jets found with k T algorithm in inclusive mode DGLAP: sums over ln(Q 2 ) terms (LEPTO, RAPGAP, DISENT, NLOjet++) ordering in both k T and x well tested over large range of Q 2 BFKL: sums over ln(1/x) terms (~ ARIADNE (CDM)) Strong ordering in x, but not ordered in k T More energetic forward jets Jets less correlated in energies, angles CCFM: k T factorization (CASCADE) Evolution in Q 2, x Approaches BFKL for low x Bj, DGLAP for high Q 2 angular ordering (instead of k T ordering) uses unintegrated parton densities First examine DGLAP NLO calculations

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, H1 Dijet Azimuthal Correl. vs. x Bj Examine   correlation of dijets at low x Bj   Sensitive to parton evolution scheme, gluon radiation Jets are back-to-back without gluon emission Test DGLAP calculations from NLOjet Normalize to visible cross section for   < 170 in each bin of x Bj Cancellation of renormalization scale uncertainties Disagreement between data, NLOjet calculations at low x Bj, low   Kinematic region where DGLAP needs checking

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, ZEUS Dijet p T Correlations vs. x Bj |  p T | sensitive to parton evolution, gluon radiation |  p T | = 0 without gluon radiation NLOjet (DGLAP) calculations at O(  s 2 ) do not describe dijet data at low x Bj NLOjet calculations at O(  s 3 ) describe data, even at low x Bj Higher order terms important at low x Bj Allows for more gluon emission

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, ZEUS Trijet p T Correlations vs. x Bj Expand study of |  p T | by examining trijets Higher order measurement (O(  s 2 ) at LO) NLOjet calculations at O(  s 3 ) describe the data Better description at higher values of x Bj Higher-order NLO calculations not available Effect much less pronounced than for dijets vs. O(  s 2 ) NLOjet calculations

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, ZEUS 2,3-jet Azimuthal Correl. vs. Q 2, x Bj   < 120° → high-E T forward jet Measurements sensitive both to angular correlations, forward jets NLOjet calculations at O(  s 3 ) describe dijet, trijet data, even at low x Bj Dijets at low x Bj : O(  s 3 ) calcs for dijets ~ 10 x O(  s 2 ) calcs For phase space tested, DGLAP works when higher-order terms included DijetsDijetsTrijetsTrijets

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, ZEUS Inclusive Forward Jets: NLO Calculations Select forward jets with DISENT NLO predictions in agreement with data within theoretical uncertainties Theoretical uncertainty increases at lower Q 2, x Bj Higher-order terms important ZEUS inclusive forward jets described by DISENT NLO DGLAP calcs.

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, H1 Trijet Correlations Parton evolution for multijet events examined: Angular correlations Normalized jet energies For Inclusive trijet Trijet with 1, 2 forward jets Inclusive trijet data generally well-described by NLOjet calculations at O(  s 3 ) Data above calculations at low x Bj Inclusive trijet data generally well-described by NLOjet calculations at O(  s 3 ) Data above calculations at low x Bj Inclusive Trijets

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, H1 Forward Trijet Measurements Select forward jets with x jet > 0.035,  jet < 20° 2 forward jets: disagreement with NLOjet at low x Bj for d  / dx Bj More gluons expected with 2 forward jets More sensitive to higher- order terms Jets selected to favor more gluon emission NLOjet describes angular correlations well within theorectical uncertainties 1 forward jet 2 forward jets

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Leading-Order Models: Dijet Azim. Correl, Incl. Forward Jets ZEUS inclusive forward jets: Expect more forward jets with BFKL, CCFM at low x Bj LEPTO (DGLAP) consistently below measurements CASCDE (CCFM) inconsistent in description of data Better description from J2003 set 2 than set 1 ARIADNE (CDM, ~BFKL) gives best overall description H1 dijet azimuthal correlations: Expect broader   spectrum from BFKL, CCFM CASCADE with J2003 pdf set describes data at higher x Bj CASCADE predictions dependent on unintegrated gluon PDF All models fail to describe   at low x Bj

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Leading-Order Models: H1 Inclusive Trijet Correlations Trijet sample Scaled jet energies better described by CDM (~BFKL) than RAPGAP (DGLAP) Both CDM and RAPGAP (DGLAP + res. photon) fail to describe both angular correlations Four-jet sample CDM provides better description overall No NLO calculations available

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Summary: Low-x Bj Dynamics at HERA DGLAP NLO calculations describe data in general Higher-order terms important at low Q 2, x Bj NLO calculations do not describe Dijet azimuthal correlations, when normalized to visible cross section Trijet cross sections for trijets with 2 forward jets at very small x Bj Leading-order models describe data inconsistently DGLAP-based models consistently fail to describe inclusive forward jet measurements, dijet and trijet correlations CASCADE (CCFM) dependent on unintegrated PDF. Fails to describe inclusive forward jet cross sections CDM (~BFKL) gives best overall description, but fails to describe dijet azimuthal correlations, trijet angular correlations LHC implications: LHC low-x limit: ~10 -6 Tevatron low-x limit: ~10 -3 HERA analyses have tested QCD evolution to x Bj ~ 10 -4

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Backup Slides

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, Kinematic Coverage of Colliders Tevatron LHC HERA

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, H1 Dijet Azimuthal Correl. vs. x Bj Without normalization to visible cross section Reasonable description of dijet data from NLO 3-jet calculation Large theoretical uncertainties

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, H1 Dijet Azimuthal Correlations: Complete LO Results CASCADE with J2003 pdf set describes data at higher x Bj CDM, RAPGAP (dir and res) fail to describe low-  regions CDM has slightly better description at low x Bj CASCADE (CCFM) LEPTO (CDM) → used with ARIADNE RAPGAP dir (DGLAP) RAPGAP res (+ resolved photon) LEPTO (CDM) → used with ARIADNE RAPGAP dir (DGLAP) RAPGAP res (+ resolved photon)

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, ZEUS Forward Jets: Complete Results

QCD Dynamics in low-x DIS T. Danielson, U. WisconsinRencontres de Moriond, March 22, ZEUS Dijet and Trijet p T Correlations vs. x Bj