Nuclear Corrections in nu A DIS and Their Compatibility with Global NPDF Analyses

作者：Kovarik K; Schienbein I; Olness F I^*; Yu J Y; Keppel C; Morfin J G; Owens J F; Stavreva T

来源：Few-Body Systems, 2012, 52(3-4): 271-277.

DOI：10.1007/s00601-011-0297-7

We perform a global chi (2)-analysis of nuclear parton distribution functions using data from charged current neutrino-nucleus (nu A) deep inelastic scattering (DIS), charged-lepton-nucleus (a%26quot;%26quot; (+/-) A) DIS, and the Drell-Yan (DY) process. We show that the nuclear corrections in nu A DIS are not compatible with the predictions derived from a%26quot;%26quot; (+/-) A DIS and DY data. We quantify this result using a hypothesis-testing criterion based on the chi (2) distribution which we apply to the total chi (2) as well as to the chi (2) of the individual data sets. We find that it is not possible to accommodate the data from nu A and a%26quot;%26quot; (+/-) A DIS by an acceptable combined fit. This implies that either the twist-2 parton distribution functions in nuclei are not universal, or that higher-twist terms play a more important role in the nuclear environment and have to be taken into account.

• 出版日期2012-5