A Panoramic Study of K-Factors for 111 Processes at the 14 TeV LHC
arxiv(2024)
摘要
In this comprehensive study, we investigate K-factors
(K=σ_NLO/σ_LO≡ 1+δ K) for a broad array
of Standard Model processes at the 14 TeV LHC, which are pivotal for background
assessments in Beyond the Standard Model (BSM) searches. Using
MadGraph5_aMC@NLO, we calculate the leading-order and next-to-leading order
(NLO) cross-sections and compute the corresponding K-factors for 111
processes. Our analysis reveals K-factors ranging from 1.005 for pp → jjj
to 4.221 for pp→ W^±γγγ. Key findings include: (i)
processes involving photons display significantly high K-factors, attributed
to gluon-initiated processes at NLO; (ii) processes with multiple particle
productions, particularly those involving vector bosons, exhibit elevated
K-factors due to multiple real emission processes; (iii) there exists an
inverse correlation between the number of jets and δ K, indicating that
the addition of jets generally leads to a decrease in δ K. Additionally,
our investigation into differential K-factors relative to transverse momentum
and invariant mass shows notable increases with higher p_T, but minimal
changes with invariant mass. This study highlights the indispensable role of
precise K-factor evaluations for accurate interpretations of BSM search
outcomes.
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