Parton Density Uncertainties and the Determination of Electroweak Parameters at Hadron Colliders
| العنوان: | Parton Density Uncertainties and the Determination of Electroweak Parameters at Hadron Colliders |
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| المؤلفون: | Alessandro Vicini, Emanuele Bagnaschi |
| المصدر: | Physical review letters 126(4), 041801 (1-6) (2021). doi:10.1103/PhysRevLett.126.041801 Physical Review Letters |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Particle physics, Proton, density [parton], Hadron, General Physics and Astronomy, FOS: Physical sciences, Parton, momentum spectrum [transverse momentum], 01 natural sciences, High Energy Physics - Experiment, transverse momentum: momentum spectrum, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), colliding beams [hadron], statistical analysis, 0103 physical sciences, ddc:530, 010306 general physics, correlation [kinematics], Quantum chromodynamics, Physics, Large Hadron Collider, electroweak interaction, hadron: colliding beams, Electroweak interaction, High Energy Physics::Phenomenology, kinematics: correlation, Observable, lepton: transverse momentum, High Energy Physics - Phenomenology, mass [W], W: mass, Elementary Particles and Fields, parton: density, transverse momentum [lepton], Lepton |
| الوصف: | Physical review letters 126(4), 041801 (1-6) (2021). doi:10.1103/PhysRevLett.126.041801 We discuss the determination of electroweak parameters from hadron collider observables, focusing on the $W$-boson mass measurement. We revise the procedures adopted in the literature to include in the experimental analysis the uncertainty due to our imperfect knowledge of the proton structure. We show how the treatment of the proton parton density functions’ (PDFs’) uncertainty as a source of systematic error leads to the automatic inclusion in the fit of the bin-bin correlation of the kinematic distributions with respect to PDF variations. In the case of the determination of $M_W$ from the charged lepton transverse momentum distribution, we observe that the inclusion of this correlation factor yields a strong reduction of the PDF uncertainty, given a sufficiently good control over all the other error sources. This improvement depends on a systematic accounting of the features of the QCD-based PDF model, and it is achieved by relying only on the information available in current PDF sets. While a realistic quantitative estimate requires taking into account the details of the experimental systematics, we argue that, in perspective, the proton PDF uncertainty will not be a bottleneck for precision measurements. Published by APS, College Park, Md. |
| تدمد: | 1079-7114 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28ae06a4600547a305710e98df934c6eTest https://pubmed.ncbi.nlm.nih.gov/33576651Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....28ae06a4600547a305710e98df934c6e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10797114 |
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