Standard SANC modules

Andonov, A.; Arbuzov, A. B.; Bardin, D. Y.; Bondarenko, S.; Christova, P.; Kalinovskaya, L. V.; Kolesnikov, V.; Sadykov, R.

doi:10.1016/j.cpc.2009.10.004

Cited by 41 publications

(47 citation statements)

References 31 publications

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“…The latter are translated to the Fortran Fig. 39 The SANC framework scheme modules [117] for specific parton level processes with an unified treatment QCD and EW NLO corrections. The modules are utilising Looptools [126] and SANClib [127] packages for loop integrals evaluation.…”

Section: Appendix A7: Powheg_bwmentioning

confidence: 99%

“…Here we give a brief summary of the main properties of this framework. For the complete list of SANC processes see [117]. All calculations are performed within the OMS (on-mass-shell) renormalization scheme in the R ξ gauge [118], which allows an explicit control of the gauge invariance by examining the cancellation of the gauge parameters in analytical expression for matrix element.…”

Section: Appendix A: Description Of MC Codesmentioning

confidence: 99%

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Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

et al. 2017

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This report was prepared in the context of the LPCC Electroweak Precision Measurements at the LHC WG (https://lpcc.web.cern.ch/lpcc/index.php?page=electroweak_ wg) and summarizes the activity of a subgroup dedicated to the systematic comparison of public Monte Carlo codes, which describe the Drell-Yan processes at hadron colliders, in particular at the CERN Large Hadron Collider (LHC). This work represents an important step towards the definition of an accurate simulation framework necessary for very high-precision measurements of electroweak (EW) observables such as the W boson mass and the weak mixing angle. All the codes considered in this report share at least nexta e-mail: alessandro.vicini@mi.infn.it b e-mail: dow@ubpheno.physics.buffalo.edu to-leading-order (NLO) accuracy in the prediction of the total cross sections in an expansion either in the strong or in the EW coupling constant. The NLO fixed-order predictions have been scrutinized at the technical level, using exactly the same inputs, setup and perturbative accuracy, in order to quantify the level of agreement of different implementations of the same calculation. A dedicated comparison, again at the technical level, of three codes that reach next-to-nextto-leading-order (NNLO) accuracy in quantum chromodynamics (QCD) for the total cross section has also been performed. These fixed-order results are a well-defined reference that allows a classification of the impact of higher-order sets of radiative corrections. Several examples of higherorder effects due to the strong or the EW interaction are discussed in this common framework. Also the combination 123 280 Page 2 of 53 Eur. Phys. J. C (2017) 77 :280 of QCD and EW corrections is discussed, together with the ambiguities that affect the final result, due to the choice of a specific combination recipe. All the codes considered in this report have been run by the respective authors, and the results presented here constitute a benchmark that should be always checked/reproduced before any high-precision analysis is conducted based on these codes. In order to simplify these benchmarking procedures, the codes used in this report, together with the relevant input files and running instructions, can be found in a repository at https://twiki.cern.ch/twiki/ bin/view/Main/DrellYanComparison.

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Section: Appendix A7: Powheg_bwmentioning

confidence: 99%

Section: Appendix A: Description Of MC Codesmentioning

confidence: 99%

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

et al. 2017

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“…Precision tag for the QED FSR calculation implemented in PHOTOS or SANC is finally given for a broad class of observables: first for the photonic bremsstrahlung and then for complete FSR corrections. 2 In our work we concentrate on the applications for LHC experiments of techniques, calculations and programs developed earlier: PHOTOS [23][24][25][26][27][28][29], SANC [30][31][32][33][34][35][36][37][38][39] and KKMC 2 In this paper we use the name photonic bremsstrahlung whenever we want to stress that only diagrams resulting from supplementing Born level amplitudes with photon lines are considered. The name final-state radiation is used when we stress presence of additional pairs and finalstate interaction when we want to discuss separation with remaining parts of electroweak interactions.…”

Section: Introductionmentioning

confidence: 99%

QED bremsstrahlung in decays of electroweak bosons

2013

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Isolated lepton momenta, in particular their directions are the most precisely measured quantities in pp collisions at LHC. This offers opportunities for multitude of precision measurements.It is of practical importance to verify if precision measurements with leptons in the final state require all theoretical effects evaluated simultaneously or if QED bremsstrahlung in the final state can be separated without unwanted precision loss.Results for final-state bremsstrahlung in the decays of narrow resonances are obtained from the Feynman rules of QED in an unambiguous way and can be controlled with a very high precision. Also for resonances of non-negligible width, if calculations are appropriately performed, such separation from the remaining electroweak effects can be expected.Our paper is devoted to validation that final-state QED bremsstrahlung can indeed be separated from the rest of QCD and electroweak effects, in the production and decay of Z and W bosons, and to estimation of the resulting systematic error. The quantitative discussion is based on Monte Carlo programs PHOTOS and SANC, as well as on KKMC which is used for benchmark results. We show that for a large class of W and Z boson observables as used at LHC, the theoretical error on photonic bremsstrahlung is 0.1 or 0.2 %, depending on the program options used. An overall theoretical error on the QED final-state radiation, i.e. taking into account missing corrections due to pair emission and interference with initial state radiation is estimated respectively at 0.2 % or 0.3 % again depending on the program option used. a

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“…The spin correlation matrix R i j is calculated for Tauola++ universal interface by the electroweak library [31], including electroweak one loop corrections for the qq → Z /γ → τ τ parton level production process. We have checked that, the non-diagonal part of the spin density matrix remains close to zero in high energy limit, as expected from analytic form of [32] applicable for low virtualities of τ τ pairs.…”

Section: Transverse Spin Correlations In Z → τ τ Decaymentioning

confidence: 99%

TauSpinner: a tool for simulating CP effects in $$ H \rightarrow \tau \tau $$ H → τ τ decays at LHC

2014

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In this paper, we discuss application of the TauSpinner package as a simulation tool for measuring the CP state of the newly discovered Higgs boson using the transverse spin correlations in the H → τ τ decay channel. We discuss application for its main background Z /γ * → τ τ as well. The TauSpinner package allows to add, with the help of weights, transverse spin correlations corresponding to any mixture of scalar/pseudoscalar state, on already existing events using information from the kinematics of outgoing τ leptons and their decay products only. This procedure can be used when polarimetric vectors of the τ s decays and density matrix for τ -pair production are not stored with the event sample. We concentrate on the well-defined effects for the Higgs (or Higgs-like scalar) decays, which are physically separated from the production processes. TauSpinner also allows to reintroduce (or remove) spin correlations to events from Drell-Yan Z /γ * → τ τ process, the main background for the Higgs parity observables, again with the help of weights only. From the literature, we recall well-established observables, developed for measuring the CP of the Higgs, and use them as benchmarks for illustrating applications of the TauSpinner package. We also include a description of the code and prepared testing examples.

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Standard SANC modules

Cited by 41 publications

References 31 publications

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

QED bremsstrahlung in decays of electroweak bosons

TauSpinner: a tool for simulating CP effects in $$ H \rightarrow \tau \tau $$ H → τ τ decays at LHC

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