Leptoquark production in ultrahigh-energy neutrino interactions

 revisited

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Abstract

The prospects for producing leptoquarks (LQs) in ultrahigh-energy (UHE) neutrino nucleon collisions are re-examined in the light of recent interpretations of HERA data in terms of leptoquark production. We update predictions for cross-sections for the production of first- and second-generation leptoquarks in UHE nu-N and nubar-N collisions including (i) recent experimental limits on masses and couplings from the LEP and TEVATRON colliders as well as rare processes, (ii) modern parton distributions, and (iii) radiative corrections to single leptoquark production. If the HERA events are due to an SU(2) doublet leptoquark which couples mainly to (e+,q) states, we argue that there are likely other LQ states which couple to neutrinos which are close in mass, due to constraints from precision electroweak measurements.

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Improved Parton Distributions from Global Analysis of Recent Deep Inelastic Scattering and Inclusive Jet Data

H Weerts, W. K. Tung, D. Soper … (1996)

The impact of recent precision measurements of DIS structure functions and inclusive jet production at the Tevatron on the global QCD analysis of parton distribution functions is studied in detail. Particular emphasis is placed on exploring the range of variation of the gluon distribution \(G(x,Q)\) allowed by these new data. The strong coupling of \(G(x,Q)\) with \(\alpha_s\) is fully taken into account. A new generation of CTEQ parton distributions, CTEQ4, is presented. It consists of the three standard sets (\mbox{\small {\(\overline {\rm MS}\)}}, {\protect \small DIS} and leading order), a series that gives a range of parton distributions with corresponding \(\alpha_s\)'s, and a set with a low starting value of \(Q\). Previously obtained gluon distributions that are consistent with the high \(E_t\) jet cross-section are also discussed in the context of this new global analysis.

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Pair production of scalar leptoquarks at the Tevatron

P. M. Zerwas, M. Spira, T. Plehn … (1997)

We present the cross section for pair production of scalar leptoquarks \(LQ\) in \(p\bar{p}\) collisions, \(p+\bar{p} \to LQ + \bar{LQ} + X\), at the Fermilab Tevatron in next-to-leading order QCD. Including the higher-order corrections stabilizes the theoretical prediction and increases the size of the cross section for renormalization/factorization scales close to the mass of the leptoquarks. This leads to an increase of the lower bound on the mass of scalar leptoquarks by up to 15 GeV with respect to earlier analyses.