Welcome to the PDF4LHC web page for collecting information on PDF relevant processes at the LHC

The motivation for this PDF4LHC TWiki is to collect relevant information on available and future measurements for PDF studies, as well as the theoretical developments that are most pressing to make the most of LHC data. The plan, as briefly presented at the PDF4LHC meeting on December 13th is given on PDF4LHC charge and will be used as the basis of a public document that will summarise the status of PDF studies at the LHC. Right now we should collect the data.

The main charge is aiming at laying out a possible plan for key measurements to be done in the future, in order to reduce PDF systematics with LHC data, using present experience. In the last weeks it became also important that important to think on the precise measurements on the boundaries of the LHC kinematic phase space to help reducing the extrapolations needed for PDFs for eg FCC studies in the next years, so suggestions tailored to this question are also welcome.

People should feel free to add information to this web page following the format given below. The plan is to spend the next PDF4LHC meeting end of March on an in depth discussion and organise eventual additional studies abd the editing of the document.

This Twiki is divided into three main sections: LHC data for PDF studies, theoretical calculations and tools, and methodological issues in PDF fits.

LHC data for PDF studies

LHC data from Run I - Public results
Process Data Theory
Inclusive W, Z production ATLAS 2010 data arXv:1109.5141 Differential predictions at NNLO QCD
WZinclusiveData WZinclusiveTheory
Inclusive W,Z production LHCb 7 TeV 37pb-1 (mu) arXv:1204.1620  
Inclusive Z production LHCb 7 TeV 940pb-1 (e) arXv:1212.4620  
Inclusive W/Z production CMS 8 TeV 19pb-1 (e/mu) arXiv:1402.0923 Inclusive cross section at NNLO
CMS 7 TeV 36pb-1 (e/mu) arXiv:1107.4789  
W lepton charge asymmetry CMS 7 TeV 840pb-1 (e) arXiv:1206.2598  
W lepton charge asymmetry CMS 7 TeV 5fb-1 (mu) arXiv:1312.6283  
Top quark pair production ATLAS 7 TeV 5fb-1 ATL-PHYS-PUB-2013-056
Top quark pair production ATLAS 7 TeV and 8 TeV data Inclusive cross-sections at NNLO
CMS 7 and 8 TeV data Differential distributions at NLO+NNLL, full NNLO in progress
TTbarData TTbarTheory
Isolated photon production ATLAS 7 TeV data from 2011 run arXiv:1311.1440 Differential distributions at NLO
DirectPhotonData DirectPhotonTheory
Isolated photon production CMS 7 TeV 36pb-1 arXiv:1108.2044  
Isolated photon + jet CMS 7 TeV 2.1fb-1 arXiv:1311.6141  
W production in association with charm ATLAS 2011 data arXv:1402.6263  
W production in association with charm CMS 7 TeV 5fb-1 arXiv:1310.1138  
Z production in association with charm LHCb 7 TeV 1fb-1 arXv:1401.3245  
Z rapidity and transverse momentum CMS 7 TeV 36pb-1 arXiv:1110.4973  
Z transverse momentum ATLAS 7 TeV 4fb-1 arXiv:1211.6899  
Inclusive jet production ATLAS 2011 2.76 data arXv:1304.4739  
Dijet production ATLAS 2011 data arXv:1312.3524  
Inclusive jet and dijet production CMS 7 TeV 5fb-1 arXiv:1212.6660  
3/2 jets ratio CMS 7 TeV 5fb-1 arXiv:1304.7498  
Z + jets LHCb 7 TeV 1fb-1 arXv:1310.8197  
Z + jets ATLAS 7 TeV 4fb-1 arXv:1304.7098  
Single top production    
Low-mass Drell-Yan ATLAS 2011 and 2010 data arXv:1404.1212  
High-mass Drell-Yan ATLAS 2011 data arXiv:1305.4192  
Drell-Yan CMS 7 TeV 5fb-1 arXiv:1310.7291  
Exclusive J/psi LHCb 7 TeV 1fb-1 arXv:1401.3288  

LHC data from Run I - Results not yet available (preliminary only)
Process Data Theory
Inclusive W, Z production ATLAS 2011 and 2012 data Differential predictions at NNLO QCD
WZinclusiveData WZinclusiveTheory
Z high-pT and Y CMS 8 TeV 20fb-1: SMP-13-013  
Inclusive jets CMS 8 TeV 20fb-1: SMP-12-012  
3-jets mass CMS 7 TeV 5fb-1: SMP-12-027  


The inclusive production of W and Z boson is directly sensitive to the quark/antiquark flavor separation. The measurement of the rapidity distributions of the final state leptons provides a handle on quarks and antiquarks in a broad range of x. Data for this process is available from ATLAS, CMS and LHCb



Direct photon production at the LHC probes the gluon PDF via the QCD Compton Scattering

Theoretical Calculations


Fully differential predictions for W and Z production at hadron colliders are available in NNLO QCD in tools like FEWZ and DYNNLO

Inclusive Jets, Di-jets, Tri-jets

Fully differential predictions at hadron colliders are available only in NLO QCD NLO predictions can be interfaced to APPLgrid either via MCFM or to FastNLO via NLOJJet++


The NNLO calculation of inclusive top quark pair production cross-sections was presented in arXiv:1303.6254. This calculation was used to study the constraints on g(x,Q) from the most updated top quark pair cross-section data from ATLAS and CMS in arXiv:1303.7215


For isolated photon production the theory is available at NLO in QCD. For the direct component (not the fragmentation) NLO predictions can be interfaced to APPLgrid either via MCFM or aMCatNLO.

The constraints on the gluon PDF from LHC direct photon data were quantified in arXiv:1202.1762. Since this publication however many new data have become public. Also one needs to study the impact of theoretical uncertainties.

Methodological issues in PDF studies

PDF4LHC Web Utilities

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Topic revision: r11 - 2014-05-05 - AmandaSarkar
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