Scattering amplitudes from unitarity-based reduction algorithm at the integrand-level

By Pierpaolo Mastrolia, G. Ossola, Thomas Reiter, Francesco Tramontano. 2010

197 citations recorded by the source corpus.

Abstractsamurai is a tool for the automated numerical evaluation of one-loop corrections to any scattering amplitudes within the dimensional-regularization scheme. It is based on the decomposition of the integrand according to the OPP -approach, extended to accommodate an implementation of the generalized d-dimensional unitarity-cuts technique, and uses a polynomial interpolation exploiting the Discrete Fourier Transform. samurai can process integrands written either as numerator of Feynman diagrams or as product of tree-level amplitudes. We discuss some applications, among which the 6-and 8-photon scattering in QED, and the 6-quark scattering in QCD. samurai has been implemented as a Fortran90 library, publicly available, and it could be a useful module for the systematic evaluation of the virtual corrections oriented towards automating next-to-leading order calculations relevant for the LHC phenomenology.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/97aaafab09eb922c88d1466d4098e645cf0bab26

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In Nuclear and High Energy Physics

Citations in the corpus

Automation of one-loop QCD computations (2011, methodology): “MadFKS has already employed several programs other than MadLoop for the computation of one-loop contributions: BlackHat [4], Rocket [5], and Samurai [6] (see e.”
HW±/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO (2013, methodology): “The list of possible extensions useful in conjunction with the POWHEG BOX is: • samurai: use SAMURAI for the reduction • golem95: use Golem95 for the reduction • numpolvec: evaluate polarization vectors numerically • derive: tensorial reconstruction using derivatives • formopt: (with FORM ≥ 4.0) dia”
On-the-fly reduction of open loops (2017, unknown): “eric subtree w a corresponds to the part of a certain Feynman diagram that connects an internal oﬀ- shell line with outgoing momentum k a to a subset of external particles, E a= {α a1,...,α an a }⊂E. (14) In the numbering scheme (9)–(10), the helicity conﬁgurations of a subtree are labeled h a= ¯h α”
Handbook of LHC Higgs Cross Sections: 3. Higgs Properties (2013, methodology): “More specifically, the virtual corrections are evaluated using the d-dimensional integrand-level decomposition implemented in the SAMURAI library [302], which allows for the combined determination of both cut-constructible and rational terms at once.”
A brief introduction to modern amplitude methods (2013, unknown): “ 42 – These new, eﬃcient methods have enabled the construction of a variety of automated computer programs for generating one-loop amplitudes, including CutTools[47], BlackHat[35], Rocket[48], SAMURAI[49], NGluon[50], MadLoop[51], HELACNLO[52], GoSam[53], Open Loops[54] and Recola[55]. For NLO QCD c”
GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond (2014, methodology): “Basic work ow of GoSam. The amplitudes are evaluated using D-dimensional reduction at integrand level [16, 31, 58], which is available through two dierent reduction procedures and libraries: Samurai [25,33] and Ninja [35,36]. Alternatively, tensorial reconstruction [27] is also available, based on t”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “Alternatively one can choose between an OPP reduction [95,510,561] as implemented in Samurai [564], or the tensor reduction methods contained in the Golem95 library [567, 579–581].”
Recursive generation of one-loop amplitudes in the Standard Model (2012, background): “These are overcome by computing the amplitude in quadruple or multiple precision at critical phase-space points, reducing however the CPU efficiency [41, 42].”
Electroweak radiative corrections for collider physics (2019, methodology): “To this end, it uses Ninja [253], Samurai [252], and CutTools [239] or the internal tensor-integral library IREGI, PJFry [219], Golem95C [226], and Collier [228, 229], respectively.”
UFO - The Universal FeynRules Output (2011, methodology): “Hence, the one-loop matrix-element generator GoSam [24,25,26] contains an interface to the UFO format, where the information from the Python module described in Section 2 is translated into a model deﬁnition for the QGraf package [43] together with a Form [44] module substituting the expressions…”
Collier: A fortran-based complex one-loop library in extended regularizations (2016, methodology): “For the calculation of the one-loop matrix elements different approaches have been developed and implemented like CutTools [11], HELAC-1LOOP [12], Samurai [13], Madloop [14], OpenLoops [15], or Recola [16].”