Conveners
PDFs
- Jun Gao (Southern Methodist University)
- Ringaile Placakyte (Deutsches Elektronen-Synchrotron Hamburg and Zeuthen (DE))
- Lucian Harland-Lang (University College London)
PDFs: PDFs
- Ringaile Placakyte (Deutsches Elektronen-Synchrotron Hamburg and Zeuthen (DE))
- Jun Gao (Southern Methodist University)
- Lucian Harland-Lang (University College London)
PDFs: PDFs
- Jun Gao (Southern Methodist University)
- Ringaile Placakyte (Deutsches Elektronen-Synchrotron Hamburg and Zeuthen (DE))
- Lucian Harland-Lang (University College London)
PDFs: PDFs
- Jun Gao (Southern Methodist University)
- Ringaile Placakyte (Deutsches Elektronen-Synchrotron Hamburg and Zeuthen (DE))
- Lucian Harland-Lang (University College London)
Lucian Harland-Lang
(University College London)
01/09/2015, 16:30
PDFs
We present the MMHT14 PDFs, an update of the previous major release in
the same framework, i.e. MSTW08. We discuss the changes in both the
central values and uncertainties in the PDFs due to changes in
theoretical procedures and the impact of new, largely LHC data-sets. We
note, however, that changes in predictions are rather small. We discuss
the correlation between the PDFs and the...
Daniel Stump
(Michigan State University)
01/09/2015, 17:00
PDFs
The CTEQ-TEA collaboration has published their next generation
global analysis of QCD, with PDFs named CT14 PDFs.
The purpose of the talk is to summarize this work,
and describe some methods that we use.
The talk will include these topics:
an overview of the CT14 PDFs; the LHC data, and other new data,
that has been used in the CT14 analysis; the impact of CT14 PDFs
on predictions for...
Stefano Carrazza
(Università degli Studi e INFN Milano (IT))
01/09/2015, 17:30
PDFs
We discuss the effect of the complete leading-order QED corrections to the DGLAP equations in the perturbative evolution of parton distribution functions (PDFs). This requires the extension of the purely QCD DGLAP evolution, including a PDF for the photon and, consistently, also for the charged leptons e±, μ± and τ±. We present the implementation of the QED-corrected DGLAP evolution in the...
Prof.
liuti simonetta
01/09/2015, 18:00
PDFs
I will discuss the application of an alternative type of neural network, the Self-Organizing
Maps (SOMs), to extract parton distribution functions from various hard scattering processes.
SOMs provide a complementary algorithm to NNPDFs yielding a parametrization that is free
from the bias implicit in choosing specific analytic forms. At the same time it enables us to
extrapolate to...
Bjoern Penning
(Imperial College Sci., Tech. & Med. (GB))
02/09/2015, 16:30
PDFs
We present $W$ boson and lepton charge asymmetry measurements from $W$ decays in the electron channel, with 9.7 fb$^{-1}$ of RunII data collected by the D0 detector at the Fermilab Tevatron Collider. The electron charge asymmetry is presented as a function of the electron transverse momentum and pseudo-rapidity out to $|\eta|\leq 3.2$; we also give the $W$ charge asymmetry as a function of $W$...
Andrey Sapronov
(Joint Inst. for Nuclear Research (RU))
02/09/2015, 17:00
PDFs
The uncertainties of protons parton distribution functions (PDFs) play a dominant role for the precision tests of the Standard Model (SM) and they also impact substantially the theory predictions of Beyond SM high mass production. We present the HERAFitter project which provides a unique open-source software framework for the determination of the proton's PDFs and for the interpretation of...
Nestor Armesto Perez
(Universidade de Santiago de Compostela (ES))
02/09/2015, 17:30
PDFs
The Large Hadron-Electron Collider LHeC is a proposed upgrade of the LHC to study ep/eA collisions in the TeV regime, by adding a 60 GeV electron beam through an Energy Recovery Linac. In this talk new results are presented on the physics prospects on energy frontier eA collisions with this machine, with emphasis new results on the precise determination of nuclear parton densities.
Claire Gwenlan
(University of Oxford (GB))
02/09/2015, 18:00
PDFs
The LHeC is a proposed upgrade of the LHC to study ep/eA collisions in the TeV regime, by adding a 60 GeV electron beam through an Energy Recovery Linac. New evaluations are presented on the prospects for precisely determining the proton PDFs, with complete flavour unfolding in a single experiment, and the strong coupling constant with per mille accuracy.
Juan Rojo Chacon
(University of Oxford (GB))
03/09/2015, 12:00
PDFs
The current PDF4LHC recommendation to estimate uncertainties due to parton distribution functions (PDFs) in theoretical predictions for LHC processes involves the combination of separate predictions computed using PDF sets from different groups, each of which comprises a relatively large number of either Hessian eigenvectors or Monte Carlo (MC) replicas. While many fixed-order and parton...
Albert De Roeck
(CERN)
03/09/2015, 12:30
PDFs
In 2010 the PDF discussion forum PDF4LHC provided a recommendation for parton distributions and uncertainties based on existing PDF sets from different PDF fitting groups. These recommendations have been widely used, notably in the LHC Higgs study groups, and for experimental result systematics by the experiments. PDF4LHC has worked over the past few years to re-evalute the procedures and...
Wally Melnitchouk
(Jefferson Lab)
04/09/2015, 11:30
PDFs
We present the results of a new global QCD analysis of PDFs from the CTEQ-Jefferson Lab collaboration (dubbed "CJ15"), which includes several new data sets and recent theoretical developments. In particular, we study the constraints from new D0 data on *W* boson asymmetries on the *d/u* PDF ratio at large *x*, and, indirectly, on the models of nuclear corrections in the deuteron. The analysis...
Amanda Sarkar
(University of Oxford (GB))
04/09/2015, 12:00
PDFs
The impact of recent measurements of heavy-flavour production in deep inelastic $ep$ scattering and in $pp$ collisions on parton distribution functions is studied in a QCD analysis in the fixed-flavour number scheme at next-to-leading order. Differential cross sections of charm- and beauty-hadron production measured by LHCb are used together with inclusive and heavy-flavour production cross...
Rhorry Gauld
(IPPP Durham University)
04/09/2015, 12:30
PDFs
Measurements of forward heavy quark production simultaneously provides sensitivity to relatively large- and small-$x$ PDFs. I will discuss how measurements of prompt charm production (with carefully selected observables) can be used to constrain the gluon PDF for values of $x < 10^{-5}$ --- a kinematic region which is not well constrained by pre-LHC data.
