NLO production of W± and Z0 vector bosons via hadron collisions in the frameworks of Kimber-Martin-Ryskin and Martin-Ryskin-Watt unintegrated parton distribution fu

Abstract

In a series of papers, we have investigated the compatibility of the Kimber-M artin-Ryskin (KM R) and M artin-Ryskin-W att (M RW ) unintegrated parton distribution functions (U P DF ) as well as the description of the experimental data on the proton structure functions. The present work is a sequel to that survey, via calculation of the transverse momentum distribution of the electro-weak gauge vector bosons in the k t -factorization scheme, by the means of the KM R, the LO M RW and the N LO M RW U P DF , in the next-to leading order (N LO).

Electroweak Radiative Corrections in Precision LHC Measurements of $W^\pm/Z^0$+jets

“…This would create an intrinsic ambiguity in the calculations that may be reduced with the inclusion of higher-order perturbative QCD and EW corrections. Nevertheless, it would be instructive to produce an equivalent set of predictions using the UPDFs of KMR that are less sensitive to the variations of PDFs [25]. In such a framework, UPDFs are used instead of PDFs to weight the relevant ladder-type partonic sub-processes, while the MEs are calculated using the eikonal approximation for the incoming quark spin-densities and the non-sense polarization approximation for the polarization vectors of the incoming gluons [25,31], in addition to suppressing soft gluon singularities by employing an AO constraint.…”

“…The predicted signals are compared with the experimental measurements from the ATLAS collaboration [21,22] and against third-party theoretical predictions within the k t -factorisation framework, using the unintegrated parton distribution functions (UPDFs) of Kimber-Martin-Ryskin (KMR) [23,24]. The latter framework has been used as a control signal since its validity in correctly predicting the behavior of experimental observations has been repeatedly proven to be independent of the use parton shower enhancements [25][26][27][28][29][30], while being computationally expensive and unsuitable for use in multi-purpose event generators.…”

A detailed study of charm content of a proton in the frameworks of the Kimber-Martin-Ryskin and Martin-Ryskin-Watt approaches

“…In our previous articles, we investigated the general behavior and stability of the KM R and M RW schemes [19][20][21][22][23][24][25][26][27]. Also, we have successfully used KM R-U P DF to calculate the inclusive production of the W and Z gauge vector bosons [28,29], the semi-N LO production of Higgs bosons [30], the production of forward-center and forward-forward di-jets [31], the prompt-photon pair production [32] and recently in the reference [33], we explored the phenomenology of the integral and the differential versions of the KM R-U P DF using the angular (strong) ordering (AOC (SOC)) constraints. But here, to check the reliability of generated U P DF , we use them to calculate the observable, deep inelastic scattering the charm structure functions (F cc 2 (x, Q 2 )).…”

A phenomenological investigation of the integral and the differential versions of the $${\textit{Kimber}}$$–$${\textit{Martin}}$$–$${\textit{Ryskin}}$$ $${\textit{unintegrated}}$$ parton distribution functions using two different constraints and the $${\textit{MMHT}}2014$$ $${\textit{PDF}}$$

“…In our previous works [12][13][14], to validate KMR approach, we have utilized the unintegrated parton distribution functions in the KMR k t -factorization procedure by using the set of MRST99 [15] and MSTW2008-LO [16] PDF as the inputs to calculate the proton structure function and the proton longitudinal structure function. Also, we successfully used the UPDF of the KMR approach to calculate the inclusive production of the W and Z gauge vector bosons [17,18], the semi-NLO production of Higgs bosons [19] and the production of forward-center and forward-forward di-jets [20].…”