2021
DOI: 10.1140/epjc/s10052-021-09057-0
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Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs

Abstract: We present the new MSHT20 set of parton distribution functions (PDFs) of the proton, determined from global analyses of the available hard scattering data. The PDFs are made available at NNLO, NLO, and LO, and supersede the MMHT14 sets. They are obtained using the same basic framework, but the parameterisation is now adapted and extended, and there are 32 pairs of eigenvector PDFs. We also include a large number of new data sets: from the final HERA combined data on total and heavy flavour structure functions,… Show more

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Cited by 313 publications
(281 citation statements)
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“…The nuclear corrections that account for these deviations can be computed with increasing sophistication and connection to the formal theory describing low-energy dynamics. One can, for example, utilize phenomenological, data-driven ratios to convert nuclear-target cross sections to free-nucleon ones [11,37]; parametrize and fit the nuclear deformation of the PDFs either inside the deuteron in a nucleon PDF fit [13,38] or in a heavy nucleus in a nuclear PDF fit [39][40][41][42][43][44]; or, finally, adopt a dynamical model of the low-energy nucleon-nucleon interactions and calculate the hard cross-section as a double convolution of parton distributions inside the nucleons and nucleon wave functions inside the nuclear targets [9,45,46]. The resulting extractions of the nucleon PDFs from nuclear data then have a dependence on the assumed nuclear corrections.…”
Section: The Role Of Nuclear-medium Effectsmentioning
confidence: 99%
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“…The nuclear corrections that account for these deviations can be computed with increasing sophistication and connection to the formal theory describing low-energy dynamics. One can, for example, utilize phenomenological, data-driven ratios to convert nuclear-target cross sections to free-nucleon ones [11,37]; parametrize and fit the nuclear deformation of the PDFs either inside the deuteron in a nucleon PDF fit [13,38] or in a heavy nucleus in a nuclear PDF fit [39][40][41][42][43][44]; or, finally, adopt a dynamical model of the low-energy nucleon-nucleon interactions and calculate the hard cross-section as a double convolution of parton distributions inside the nucleons and nucleon wave functions inside the nuclear targets [9,45,46]. The resulting extractions of the nucleon PDFs from nuclear data then have a dependence on the assumed nuclear corrections.…”
Section: The Role Of Nuclear-medium Effectsmentioning
confidence: 99%
“…An analysis similar in spirit to the CJ15 fit is available from the AKP group [45], and differences in the extracted off-shell functions are currently being investigated by the two groups jointly. Alternatively, the deuteron correction can be fitted using a purely phenomenological parametrization as in the MSHT20 analysis [13], or the additional uncertainty associated with the deuteron effects can be learned from the global analysis data themselves, as done in the NNPDF study [37]. Other groups do not include deuteron corrections by selecting the fitted data in a {x, Q} region where the deuteron corrections are small compared to the precision of data, as is done, e.g., in the CT18 analysis [11].…”
Section: The Role Of Nuclear-medium Effectsmentioning
confidence: 99%
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“…In the past years significant progress has been made in performing high-precision calculations for exclusive and inclusive jet production as well as jet substructure observables. Aside from being a means to constrain parton distribution functions (PDFs) of the proton [2][3][4][5][6], an integral part of searches for new physics [7][8][9], and a sensitive probe of the strong coupling constant [10,11], another fundamental concern in these studies is how exactly energy is distributed into the states registered in the detector. These states can be considered at different levels of resolution, from the irreducible individual hadrons, to large radius jets which may or may not have multi-prong substructure [12][13][14].…”
Section: Introductionmentioning
confidence: 99%
“…We have used MadGraph5_aMC@NLO [35] for the complete NLO cross sections. Results are given for a number of NLO pdf sets (left plot) and NNLO pdf sets (right plot), including MMHT2014 [36], NNPDF3.1 [37], CT18 [38], and MSHT20 [39]. The results with the different pdf sets are relatively close to each other.…”
Section: Total Cross Sections For Tw Productionmentioning
confidence: 73%