English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We revisit the hadronic production of the four-lepton final state, e^- e^+\mu^- \mu^+, through the fusion of initial state gluons. This process ismediated by loops of quarks and we provide first full analytic results forhelicity amplitudes that account for both the effects of the quark mass in theloop and off-shell vector bosons. The analytic results have been implemented inthe Monte Carlo program MCFM and are both fast, and numerically stable in theregion of low Z transverse momentum. We use our results to study theinterference between Higgs-mediated and continuum production of four-leptonfinal states, which is necessary in order to obtain accurate theoreticalpredictions outside the Higgs resonance region. We have confirmed and extendeda recent analysis of Caola and Melnikov that proposes to use a measurement ofthe off-shell region to constrain the total width of the Higgs boson. Using asimple cut-and-count method, existing LHC data should bound the width at thelevel of 25-45 times the Standard Model expectation. We investigate the powerof using a matrix element method to construct a kinematic discriminant tosharpen the constraint. In our analysis the bound on the Higgs width isimproved by a factor of about 1.6 using a simple cut on the MEM discriminant,compared to an invariant mass cut m_{4l} > 300 GeV.

Bounding the Higgs width at the LHC using full analytic results for gg -> 2e 2\mu