Working Group on Electroweak precision measurements at the LHC

4 Apr 2011, 09:00 → 5 Apr 2011, 18:30 Europe/Zurich

TH Theory Conference Room (CERN)

Michelangelo Mangano (CERN)

 Working group conveners:

• ATLAS: M. Boonekamp and J. Guimaraes da Costa
• CMS: M. Schmitt and G.De Monchenault
• LHCb: R. McNulty and T.Shears
• LPCC: M. Mangano

 To subscribe to the WG mailing list, go to

http://simba3.web.cern.ch/simba3/SelfSubscription.aspx?groupName=LHC-EWWG

For information relative to

• housing
• access to CERN for those not holding a CERN card
• laptop registration

please check http://lpcc.web.cern.ch/LPCC/index.php?page=visit

    

Monday 4 April

09:00 → 13:00 W/Z Cross sections and asymmetries

09:00 Introduction

Slides MLM-Intro.pdf

09:10 W/Z and DY production, pt spectra, asymmetries: ATLAS

Speaker: Alberto Belloni (Physics Department - Jefferson Physical Laboratory - Harvard Uni)

Discussion 110404_lhcewdis.pdf

Slides 110404_lhcew.pdf

09:40 W/Z and DY production, pt spectra, asymmetries: CMS

Speaker: Prof. Jeremiah Mans (University of Minnesota/CMS)

Slides LHC_EWWG_CMS_April2011.odp LHC_EWWG_CMS_April2011.pdf

10:10 W/Z and DY production, pt spectra, asymmetries: LHCb

Speaker: Dr Tara Shears (UNIVERSITY OF LIVERPOOL)

Slides tara.pdf

10:40 Coffee break

11:00 Simulation of FSR radiation in W and Z decays

Speaker: Zbigniew Was (High Energy Department - Henryk Niewodniczanski Inst. Nucl. Phys)

Slides WasApr4.pdf

11:20 EM/EW corrections in DY Monte Carlos: status, systematics and examples of Tevatron applications

Speaker: Alessandro Vicini (Dip. di Fisica Nucleare e Teorica-Universita degli Studi di Pavi)

Slides vicini-EW-status.pdf

11:50 Discussion

The goal is to outline and start addressing the issues relevant for a uniform definition of cross sections across the experiments, and for the combination of experimental results, including W+gamma final states Topics to be covered in the discussion: * Common fiducial volumes. Uncertainty in extrapolation of one experiments' results to the others' volume * optimal fiducial volume (minimize theoretical uncertainties) * effects of crack interpolations * possible agreement on theoretical setup (inclusion of QED/EW corrections, reference external PDF set, reference MC codes, etc) * "standardize" correlated and uncorrelated systematic uncertainties to be addressed, and think towards a common approach. * averaging procedures

13:00 → 14:00 Lunch break

14:00 → 18:00 W mass

14:00 Review of the Tevatron experience

Speaker: Jan Stark (LPSC Grenoble)

Slides Stark_Tevatron.pdf

14:30 Discussion of commonalities/differences at the LHC

15:00 Simulation of inclusive DY pt distributions: comparisons among various calculations (POWHEG, Resbos, DYNNLO, DYQT)

Speaker: giuseppe bozzi (universita' degli studi di milano)

Slides bozzi1.pdf

15:20 Impact of DY modeling and tunings on MW measurement

Speaker: Alessandro Vicini (Dip. di Fisica Nucleare e Teorica-Universita degli Studi di Pavi)

Slides vicini-QCD-tuning.pdf

15:40 Remarks on the PDF systematics in the measurement of MW

Speaker: Mieczyslaw Krasny (Universites de Paris VI et VII)

Slides Krasny_LPCC_Precision_APRIL2011.pdf

16:10 Coffee break

16:30 MW and PDF sensitivity of Drell-Yan observables

Speaker: giuseppe bozzi (universita' degli studi di milano)

Slides bozzi2.pdf

16:50 MW discussion

Experimental systematics, detector simulation issues, generation CPU constraints: what are the needs for the studies of precision EW physics? Are there items of common interest to all experiments, in the detector simulation area, for which resources need to be allocated?

Tuesday 5 April

09:00 → 13:00 PDF issues: systematics for Xsection predictions, and W/Z data as inputs for PDF fits

09:00 Assessment of the impact of LHC W lepton asymmetry data on PDF fits

Speaker: Dr Maria Ubiali (RWTH Aachen University)

Slides rwLHC_ubiali.pdf

09:30 W/Z cross sections: PDF systematics at NNLO

Speaker: Johannes Bluemlein (DESY)

Slides blumlein.pdf blumlein.pdf

10:00 PDF dependence of W/Z cross sections and lepton charge asymmetry at the LHC

Speaker: Graeme Watt

Slides watt_lhcewwg.pdf

10:20 Discussion

10:50 Coffee break

11:10 LHCb: tools to incorporate LHCb data in fits

Speaker: Dr Ronan McNulty (University College Dublin)

Slides Updating_PDF_with_LHC_data.pdf Updating_PDF_with_LHC_data.ppt

11:30 ATLAS tools for PDF fitting of W/Z distributions

Speaker: Alexandre Glazov (Deutsches Elektronen-Synchrotron (DESY))

Slides atlastools.pdf

11:50 Discussion: Use of LHC jet data in PDF fits

13:00 → 14:00 Lunch break

14:00 → 17:35 A_FB, sin2thetaW, W+jets, and more

14:00 First study of AFB and measurement of sin2thetaW at CMS

Speaker: Andrei Gritsan (Rowland Dept. of Phys. and Astron.-Johns Hopkins University-Unkn)

Slides sin2thetaW_05apr2011.pdf

14:20 LHCb: prospects for a precisce measurement of AFB

Speaker: Dr Ronan McNulty (University College Dublin)

Slides afb_lhc.pdf afb_lhc.ppt

14:50 Mixed EW/QCD corrections in MCs

Speaker: Fulvio Piccinini (Unknown)

Slides piccinini.pdf

15:10 Theoretical issues in extracting sin2thetaW from AFB at the LHC: EW corrections, EW-QCD interference, PDFs, .....

Speakers: Michelangelo Mangano (CERN), Wolfgang Hollik

Slides AFB_Hollik.pdf MLM-AFB.pdf

15:30 Coffee break

15:45 ATLAS: W/Z+jets, including heavy quarks: status and issues

Speaker: Gavin Hesketh (University College London-University of London)

Slides ATLAS_vjets_gavin.pdf

16:05 CMS: W/Z+jets, including heavy quarks: status and issues

Speaker: Matthias U. Mozer (Unknown)

Slides wzjetscms.pdf

16:25 EW corrections to V+jet production at the LHC

Speaker: Tobias Kasprzik (KIT, Karlsruhe)

Slides talk_tk_cern.pdf

16:45 Discussion

* Algorithms and cone sizes * jet calibration procedures and systematics * Large angle FSR photons and jet/lepton overlap removal. Leptons, neutrinos, FSR photons included or not in jet definition? * Make a list of possible additional measurements, of interest for EW physics or PDF determinations. For example: - W+charm - gamma + charm - Z + b