Effect of asymmetric strange–antistrange sea to the NuTeV anomaly

Isospin symmetry breaking in the chiral quark model

“…This model is successful in explaining numerous problems, including the violation of the Gottfried sum rule from the aspect of flavor asymmetry in the nucleon sea [24,25], the proton spin crisis [26][27][28], and the NuTeV anomaly resulting from the strange-antistrange asymmetry [13], and has been widely recognized as an effective theory of QCD at the low-energy scale.…”

“…The reported sin 2 θ W = 0.2277 ± 0.0013 (stat) ± 0.0009 (syst) has approximately 3 standard deviations above the world average value sin 2 θ W = 0.2227±0.0004 measured in other electroweak processes. This remarkable deviation is called the NuTeV anomaly and was discussed in a number of papers from various aspects, including new physics beyond the standard model [8], the nuclear effect [9], nonisoscalar targets [10], and strange-antistrange asymmetry [11][12][13]. Moreover, the possible influence of ISB on this measurement was also studied in a series of papers [14][15][16][17][18][19][20].…”

Strange-quark asymmetry in the proton in chiral effective theory

“…Using an effective chiral quark model with constituent quarks coupling to Goldstone bosons, Ding et al [33] found S − ≈ (4 − 9) × 10 −3 , depending on the input used for bare constituent quark distributions. Wakamatsu [34] used an SU(3) chiral quark soliton model with an effective mass difference parameter between the strange and nonstrange quarks to obtain the range S − = (2.5 − 5.5) × 10 −3 .…”

Nucleon strangess¯asymmetry to theΛ/ΛChi1, Du2, Ma3 2014Phys. Rev. DSelf Cite101240View full textAdd to dashboardCite

“…We divide these studies into two groups. One is the study mainly focusing on the nonperturbative process that is believed to be able to produce an asymmetric intrinsic strange sea [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The other is the next-to-next-to-leading order perturbative evolution process which is pointed out to be able to cause an extrinsic strange sea asymmetry [18,19].…”