How well do we know the gluon polarization in the proton?
نویسندگان
چکیده
We perform the first simultaneous global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs), including single jet production data from unpolarized polarized hadron collisions. critically assess impact SU(3) flavor symmetry PDF positivity assumptions on quark gluon helicity PDFs, find strong bias these, particularly polarization. The allows for time extraction individual helicity-aligned antialigned PDFs with a consistent treatment uncertainties.
منابع مشابه
How Well Do We Know Bernoulli?
Näıve Bayes probabilistic models are widely used in text categorization because of their efficient model training and good empirical results. Bayesian classifiers face a common issue called data sparsity problem which makes an adequate estimation of probabilities a difficult task. Therefore, smoothing techniques are needed in order to adjust the maximum likelihood estimators. In this preliminar...
متن کاملHow Well Do We Know the Electromagnetic Form Factors of the Proton?
Recent measurements of recoil polarization in elastic scattering have been used to extract the ratio of the electric to the magnetic proton form factors. These results disagree with Rosenbluth extractions from cross section measurements, indicating either an inconsistency between the two techniques, or a problem with either the polarization transfer or cross section measurements. To obtain prec...
متن کاملHow well do we know the neutron structure function?
We present a detailed analysis of the uncertainty in the neutron F(2n) structure function extracted from inclusive deuteron and proton deep-inelastic scattering data. The analysis includes experimental uncertainties as well as uncertainties associated with the deuteron wave function, nuclear smearing, and nucleon off-shell corrections. Correctly accounting for the Q(2) dependence of the data an...
متن کاملHow well do we know the Circumference of a Storage
For precision spectroscopical measurements of narrow states in a storage ring 6 such as HESR [1] in the FAIR facility at GSI [2] the absolute energy of the stored 7 beam needs to be known to a relative accuracy in the 10−5 range. The prime exper8 iment in the HESR is the PANDA [3] detector with an extensive physics program 9 with Hadron spectroscopy as one of its main topics. PANDA will search ...
متن کاملHow Well Do We Know the Sunspot Number?
We show that only two adjustments are necessary to harmonize the Group Sunspot Number with the Zürich Sunspot Number. The latter being inflated from the 1940s on to the present by 20% due to weighting of sunspot counts according to size of the spots, and corrected by inflating the earlier values as well. The Group Sunspot Number before ∼1885 is too low by ∼50%. With these adjustments a single s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.105.074022