Erratum to: Higher-order tree-level amplitudes in the nonlinear sigma model
Sign Up to like & getrecommendations! Published in 2021 at "Journal of High Energy Physics"
DOI: 10.1007/jhep03(2021)066
Abstract: In the original paper the supplementary material was incorrect and incomplete. The correct supplementary material is attached to this erratum. read more here.
Keywords: erratum higher; level amplitudes; order tree; higher order ... See more keywords
A differential representation of cosmological wavefunctions
Sign Up to like & getrecommendations! Published in 2022 at "Journal of High Energy Physics"
DOI: 10.1007/jhep04(2022)012
Abstract: Abstract Our understanding of quantum field theory rests largely on explicit and controlled calculations in perturbation theory. Because of this, much recent effort has been devoted to improve our grasp of perturbative techniques on cosmological… read more here.
Keywords: theory; tree level; cosmological wavefunctions; differential representation ... See more keywords
Stokes polytopes: the positive geometry for ϕ4 interactions
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep08(2019)067
Abstract: Abstract In a remarkable recent work [1], the amplituhedron program was extended to the realm of non-supersymmetric scattering amplitudes. In particular it was shown that for tree-level planar diagrams in massless ϕ 3 theory (and… read more here.
Keywords: stokes polytopes; theory; geometry; scattering amplitudes ... See more keywords
Higher-order tree-level amplitudes in the nonlinear sigma model
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep11(2019)074
Abstract: We present a generalisation of the flavour-ordering method applied to the chiral nonlinear sigma model with any number of flavours. We use an extended Lagrangian with terms containing any number of derivatives, organised in a… read more here.
Keywords: order; sigma model; tree level; amplitudes nonlinear ... See more keywords
Expansion of all multitrace tree level EYM amplitudes
Sign Up to like & getrecommendations! Published in 2017 at "Journal of High Energy Physics"
DOI: 10.1007/jhep12(2017)038
Abstract: A bstractIn this paper, we investigate the expansion of tree level multitrace Einstein-Yang-Mills (EYM) amplitudes. First, we propose two types of recursive expansions of tree level EYM amplitudes with an arbitrary number of gluons, gravitons… read more here.
Keywords: expansion; tree level; level eym; eym amplitudes ... See more keywords
Where to find structural grade timber: A case study in ponderosa pine based on stand and tree level factors
Sign Up to like & getrecommendations! Published in 2020 at "Forest Ecology and Management"
DOI: 10.1016/j.foreco.2019.117849
Abstract: Abstract Using portable acoustic tools, measurements of dynamic modulus of elasticity (Ed) were made in standing ponderosa pine (Pinus ponderosa (Dougl. ex Laws)) trees (n = 437) growing in 22 stands encompassing the range of environmental site… read more here.
Keywords: level factors; ponderosa pine; tree level; level ... See more keywords
On the massless tree-level S-matrix in 2d sigma models
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Physics A: Mathematical and Theoretical"
DOI: 10.1088/1751-8121/ab0b79
Abstract: Motivated by the search for new integrable string models, we study the properties of massless tree-level S-matrices for 2d sigma models expanded near the trivial vacuum. We find that, in contrast to the standard massive… read more here.
Keywords: tree level; level; massless tree; model ... See more keywords
Consistent treatment of charm production in higher-orders at tree-level within kT -factorization approach
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.054001
Abstract: We discuss production of cc¯-pairs within kT-factorization approach (off-shell initial partons) with unintegrated parton distribution functions (uPDFs). We present a consistent prescription which merges the standard leading-order (LO) kT-factorization calculations for this process with tree-level… read more here.
Keywords: charm; order; higher orders; factorization ... See more keywords
Vector leptoquarks beyond tree level
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.035024
Abstract: Models with massive vector leptoquarks, resulting from an SU(4) gauge symmetry spontaneously broken at the TeV scale, are of great phenomenological interest given the current “anomalies” in semileptonic B decays. We analyze the relations between… read more here.
Keywords: beyond tree; energy; tree level; leptoquarks beyond ... See more keywords
Tree-level interference in vector boson fusion production of Vh
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DOI: 10.1103/physrevd.102.033006
Abstract: Vector boson scattering is a well known probe of electroweak symmetry breaking. Here we study a related process of two electroweak vector bosons scattering into a vector boson and a Higgs boson ($VV \rightarrow Vh,… read more here.
Keywords: boson fusion; vector; level interference; tree level ... See more keywords
Lepton flavor universality violation in semileptonic tree level weak transitions
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.99.113004
Abstract: The recent deviations of the experimental data on some parameters of the tree-level semileptonic B and Bc mesons decays from the standard model (SM) predictions indicate considerable violations of the lepton flavor universality, and as… read more here.
Keywords: tree level; flavor universality; level; lepton flavor ... See more keywords