NNLO QCD predictions of electron charge asymmetry for inclusive pp→W+X production in forward region at 13 and 14 TeV

This paper presents perturbative QCD predictions of the electron charge asymmetry for inclusive W^(±)X→e^(±)v+X production in proton-proton(pp)collisions.Perturbative QCD calculations are performed at next-to-next-to-leading order(NNLO)accuracy using different parton distribution function(PDF)modelsat 8,13,and 14 TeV center-of-mass energies of CERN LHC pp collisions.NNLO calculations are performed for electrons with transverse momenta above 20 GeV in the forward electron pseudorapidity region 2.0≤ne≤4.25.NNLO predictions are first compared at 8 TeV with the measurements of the LHCb experiment at the LHC for the W^(±)/W^(-)cross section ratio and charge asymmetry distributions.The 8 TeV predictions using NNPDF3.1,CT14,and MMHT2014 PDF sets are reported to be in good agreement with the LHCb data for the entire ne region,justifying the extension of the calculations to 13 and 14 TeV energies.The charge asymmetry predictions at NNLO accuracy are reported in the forward ne bins at 13 and 14 TeV and compared among NNPDF3.1,CTI4,and MMHT2014 PDF sets.Overall,the predicted W^(±)differential cross-section and charge asymmetry distributions based on different PDF scts are found to be consistent with each other for the entire ne region.The charge asymmetry distributions are shown to be more sensitive to discriminate among different PDF models in terms of the 14 TeV predictions.

Impact of lepton pT threshold on charge asymmetry predictions for inclusive Wboson production in pp collisions at 13 TeV

This paper presents the impact of the lepton transverse momentum p^(l)_(T) threshold on the W boson charge asymmetry predictions in perturbative QCD for the inclusive W^(±)+X→l^(±)v+X production in proton-proton(pp)collisions.The predictions are obtained at various low-p^(l)_(T) thresholds p^(l)_(T)>20,25,30,and 40 GeV in a fiducial region encompassing both the central and forward detector acceptances in terms of the lepton pseudorapidity 0≤ηl≤<4.5.The predicted distributions for the lepton charge asymmetry,which is defined by ηl(Aηl),at the next-to-next-to-leading order(NNLO)accuracy are compared with the CMS and LHCb data at 8 TeV center-of-mass collision energy.The 8 TeV predictions reproduce the data fairly well within the quoted uncertainties.The predictions from the CT14 parton distribution function(PDF)model are in a slightly better agreement with the data over the other PDF sets that are tested.The 13 TeV predictions using various p^(l)_(T) thresholds are reported for An,and the charge asymmetries that are defined in terms of the differential cross sections in bins of the W boson rapidity yw(A_(yw))and transverse momentum(Apw).The NNLO predictions for the Ayw,and Apw distributions are assessed to be in close correlation with the plT value.The An,and A_(yw) distributions are particularly shown to be more correlated at a higher ^(l)_(T) threshold.The Apw distributions are also reported from the merged predictions with improved accuracy by the inclusion of the next-to-next-to-next-to-leading logarithm(N^(3)LL)corrections,i.e.,at NNLO+N^(3)LL.The predicted distributions from various ^(l)_(T) thresholds represent a finer probe in terms of the capability to provide more constraints on the ratio of u and d quark distribution functions in the parton momentum fraction range 10^(-4)<x<1.

On the Origin of Charge-Asymmetric Matter. I. Geometry of the Dirac Field

This work presents new round of the author’s pursuit for consistent description of the finite sized objects in classical and quantum field theory. Current paper lays out an adequate mathematical background for this quest. A novel framework of the matter-induced physical affine geometry is developed. Within this framework, (1) an intrinsic nonlinearity of the Dirac equation becomes self-explanatory;(2) the spherical symmetry of an isolated localized object is of dynamic origin;(3) the auto-localization is a trivial consequence of nonlinearity and wave nature of the Dirac field;(4) localized objects are split into two major categories that are clearly associated with the positive and negative charges;(5) of these, only the former can be stable as isolated objects, which explains the global charge asymmetry of the matter observed in Nature. In the second paper, the nonlinear Dirac equation is written down explicitly. It is solved in one-body approximation (in absence of external fields). Its two analytic solutions unequivocally are positive (stable) and negative (unstable) isolated charges. From the author’s current perspective, the so for obtained results must be developed further and applied to various practical and fundamental problems in particle and nuclear physics, and also in cosmology.

On the Origin of Charge-Asymmetric Matter. II. Localized Dirac Waveforms

This paper continues the author’s work [1], where a new framework of the matter-induced physical geometry was built and an intrinsic nonlinearity of the Dirac equation was discovered. Here, the nonlinear Dirac equation is solved and the localized configurations are found analytically. Of the two possible types of the potentially stationary localized configurations of the Dirac field, only one is stable with respect to the action of an external field and it corresponds to a positive charge. A connection with the global charge asymmetry of matter in the Universe and with the recently observed excess of the cosmic positrons is discussed.