Parton distributions in the LHC era: MMHT 2014 PDFs

Abstract

We present LO, NLO and NNLO sets of parton distribution functions (PDFs) of the proton determined from global analyses of the available hard scattering data. These MMHT2014 PDFs supersede the `MSTW2008' parton sets, but are obtained within the same basic framework. We include a variety of new data sets, from the LHC, updated Tevatron data and the HERA combined H1 and ZEUS data on the total and charm structure functions. We also improve the theoretical framework of the previous analysis. These new PDFs are compared to the `MSTW2008' parton sets. In most cases the PDFs, and the predictions, are within one standard deviation of those of MSTW2008. The major changes are the $u-d$ valence quark difference at small $x$ due to an improved parameterisation and, to a lesser extent, the strange quark PDF due to the effect of certain LHC data and a better treatment of the $D\to \mu$ branching ratio. We compare our MMHT PDF sets with those of other collaborations; in particular with the NNPDF3.0 sets, which are contemporary with the present analysis.

Final version. Some additional comments/clarifications and minor corrections. 83 pages, 116 figures. PDFs can be obtained from http://www.hep.ucl.ac.uk/mmht

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• Measurement of single top-quark production in the s-channel in proton$-$proton collisions at $\sqrt{\mathrm{s}}=13$ TeV with the ATLAS detector
• Performance and calibration of quark/gluon-jet taggers using 140 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of the top-quark pole mass in dileptonic $t\bar{t}+1\text{-jet}$ events at $\sqrt{s}=13$ TeV with the ATLAS experiment
• Measurements of Higgs boson production via gluon-gluon fusion and vector-boson fusion using $H\to W{W}^{\ast }\to \ell \nu \ell \nu$ decays in $pp$ collisions with the ATLAS detector and their effective field theory interpretations
• Search for dark matter produced in association with a pair of bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• A measurement of the high-mass $\tau \bar{\tau }$ production cross-section at $\sqrt{s}=13$ TeV with the ATLAS detector and constraints on new particles and couplings
• Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector
• Test of lepton flavour universality in $W$-boson decays into electrons and $\tau$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for same-charge top-quark pair production in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Constraining off-shell Higgs boson production and the Higgs boson total width using $WW\to \ell \nu \ell \nu$ final states with the ATLAS detector
• Measurements of $W^{+}{W}^{-}$ production cross-sections in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• The Proton Gluon Distribution from the Color Dipole Picture
• Single-diffractive production of dijets within the $k_t$-factorization approach
• Searching for $a_0(980)$-meson parton distribution function
• Revisiting evolution equations for generalised parton distributions
• Search for the production of a Higgs boson in association with a single top quark in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of the top-quark Yukawa coupling from $t\overline{t}$ production in the lepton+jets final state using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Monte Carlo Event Generators
• Limits on new strongly interacting matter from measurements of Transverse Energy-Energy Correlations at $\sqrt{s}=13$ TeV at the LHC
• The Forward Physics Facility at the High-Luminosity LHC
• Comparative insights into gluon and proton structure through parton distribution functions
• Search for resonant pair production of Higgs bosons in the $\mathrm{b}\bar{\mathrm{b}}\mathrm{b}\bar{\mathrm{b}}$ final state using large-area jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Extracting the parton distribution functions evolution equations using the stochastic modeling in the non-equilibrium statistical mechanics
• Quark-model relations among TMDs in the parton model
• Measurement of $W^{\pm }$-boson differential cross-sections in proton-proton collisions with low pile-up data at $\sqrt{s}=5.02$ TeV and $13$ TeV with the ATLAS detector
• Linear scaling of lepton charge asymmetry in $W^{\pm }$ production in ultra-relativistic nuclear collisions
• A global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework
• Deep inelastic (anti)neutrino-nucleus scattering
• Probing the proton structure with associated vector boson and heavy flavor jet production at the LHC
• Electroweak boson production at large transverse momentum in double polarized $pp$ scattering at next-to-leading order accuracy
• Regularising experimental correlations in LHC data: theory and application to a global analysis of parton distributions
• Search for a light CP-odd Higgs boson decaying into a pair of $\tau$-leptons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• An overview of scale invariance in proton structure with holographic insights
• Accessing the Gluon Momentum Fraction of Nucleons through the Gradient Flow
• Measurements of differential cross-sections of $WbWb$ production in the dilepton channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV using the ATLAS detector
• Improved determination of strange distribution function from the global analysis using BHPS model
• Reinterpretation of proton strangeness between ATLAS and CMS measurements
• Dijets with a large rapidity separation in the next-to-leading order BFKL formalism for searches of large extra dimensions at colliders
• Weak interaction corrections to muon pair production via the photon fusion at the LHC
• Determination of the parton distribution functions of the proton using diverse ATLAS data from $pp$ collisions at $\sqrt{s}=7$, 8 and 13 TeV