NuWro: Wrocław Neutrino Event Generator - PDF

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NuWro: Wrocław Neutrino Event Generator Tomasz Golan(University of Wrocław) and Paweł Przewłocki(National Center for Nuclear Research, Warsaw) NuInt14, Introduction General information Introduction

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NuWro: Wrocław Neutrino Event Generator Tomasz Golan(University of Wrocław) and Paweł Przewłocki(National Center for Nuclear Research, Warsaw) NuInt14, Introduction General information Introduction Multi-nucleon Detector geometry NuWro online NuWro is a Monte Carlo neutrino event generator, which has been developed for over 9 years at the Wrocław University by: Cezary Juszczak Jan Sobczyk Jarosław Nowak Tomasz Golan a significant contribution from: Krzysztof Graczyk Jakub Żmuda and others The authors were encouraged by Danuta Kiełczewska. The open-source C++ code is available in the repository: T. Golan and P. Przewłocki NuWro 3/ 16 General information Introduction Multi-nucleon Detector geometry NuWro online quasi-elastic scattering (1232) π production deep inelastic scattering coherent π production two-body current Primary interactions Llewellyn-Smith formalism Adler-Rarita-Schwinger quark-parton model Rein-Sehgal model IFIC(Nieves et al.) model MEChM*-like model Transverse Enhancement *MEChM = Martini-Ericson-Chanfray-Marteau... We thank Marco Martini for consultations in our implementation, but we alsowarnusersthatitisdifferentthantheoriginalmechmmodel. We thank Juan Nieves and collaborators for providing us his original source code. T. Golan and P. Przewłocki NuWro 3/ 16 General information Introduction Multi-nucleon Detector geometry NuWro online Fermi gas Spectralfunction Nucleus models local and global for 12 C, 16 O, 40 Ar, 40 Ca, 56 Fe Final state interactions Intra-nuclear cascade for pion: Osetetal.modelforkineticenergiesupto350MeV a phenomenological approach for higher energies Intra-nuclear cascade for nucleon: a phenomenological approach with an effective nuclear potential Other features ability to use a realistic beam ability to use a detector geometry T. Golan and P. Przewłocki NuWro 3/ 16 Multi-nucleon knockout Two-body current Introduction Multi-nucleon Two-body current Nieves et al. model Kinematics Spectral function NN xsec Protons multiplicity Detector geometry NuWro online Our strategy for two-body current contribution Itisveryimportantforthecommunitytohaveachancetouse various models. We are very grateful to authors of theoretical models who share with us their original codes. Incasewedonothaveaccesstoimportantmodelsweare trying to develop approximate approaches. T. Golan and P. Przewłocki NuWro 5/ 16 Nieves et al. model First approach Tablesfor 12 C(ν µ,µ ) d 2 σ/dt µ dcosθ µ 40valuesforE ν from155mevto 2995 MeV foreache ν 40x40tableforT µ and cosθ µ ExtensionforhigherEν Gran, Nieves, Sanchez, Vicente Vacas[PRD 88(2013) ] cutinmomentumtransfer q max = 1.2 GeV Note, similar approach is currently used in NEUT. Nucleus knows : q=(q 0, q) typeofint. Current approach d 3 σ 5 dω de i=1 It does not know : lepton mass itsenergy W i (q 0, q)f i f i dependonleptonkinematics W i response functions depend on nucleus type, channel and fourmomentum transfer Knowing W i one can calculatedoubledifferential cross section for each kind of neutrino and with no energy limit. T. Golan and P. Przewłocki NuWro 6/ 16 Nieves et al. model Both approaches give the same results. from J. Żmuda, Vanish Valencia workshop See J. Żmuda Meson Exchange Currents models in NuWro Monte Carlo generator for details. T. Golan and P. Przewłocki NuWro 6/ 16 Hadron kinematics for two-body current Introduction Multi-nucleon Two-body current Nieves et al. model Kinematics Spectral function NN xsec Protons multiplicity Detector geometry NuWro online All of them give predictions for lepton kinematics only! Four-momentum transfer qissharedbytwonucleons withfour-momentap 1 andp 2. IntheCMSframethe direction of momentum p is selected uniformly: q+p 1 +p 2 CMS (E CMS,0) p CMS 3 =(E CMS /2, p) p CMS 4 =(E CMS /2, p) p 3 andp 4 areobtainedby preforming boost back to the LAB frame. q p 1 CMS p 2 p CMS 3 p CMS 4 LAB p 3 p 4 T. Golan and P. Przewłocki NuWro 7/ 16 Spectral function Spectral function: P total ( p,e)=p MF ( p,e)+p corr ( p,e) About20%ofinteractionsoccuronacorrelated nucleon. NuWro implementation of Benhar s spectral function l Total Mean Field Part SRC Part SRC Arbitrary units l spectator Momentum [MeV/c] Thespectatorisnowalsoknockoutin NuWro. to be improved. T. Golan and P. Przewłocki NuWro 8/ 16 Nucleon-nucleon cross section Introduction Multi-nucleon Two-body current Nieves et al. model Kinematics Spectral function NN xsec Protons multiplicity Detector geometry NuWro online Usually, free nucleon-nucleus cross sections are used in nucleon cascade models. Effective density dependent NN cross section: Pandharipande, Pieper PRC45(1992) 791 InmediumNNcross section becomes much smaller. Important in MEC studies! T. Golan and P. Przewłocki NuWro 9/ 16 Protons multiplicity ArgoNeuT preliminary results K. Partyka Exclusive 1mu+np topologies in ArgoNeuT NuInt12 O.Palamara QEornotQE,thatisthequestion INTworkshop,Seattle,2013 Observable numberofprotons(t k 22MeV)inthefinalstate nopioninthefinalstate νmode νmode No. of protons Data NuWro Data NuWro more errorsareoftheorderof20% T. Golan and P. Przewłocki NuWro 10/ 16 Detector geometry Detector geometries and flux informa3on in NuWro NuWro can now make simula3ons in a real detector environment ROOT geometry defini3ons supported spa3al distribu3on of materials with given density and composi3on extremely fast simula3on code vertex posi3on/outgoing par3cles are saved can be further used in detector simula3on socware This feature has already been used in T2K experiment (see next slide) from Jakub Żmuda, Vanish 2014 Valencia workshop Beam flux files are supported NuWro can read neutrino by neutrino from flux files generated by beam MC important for off- axis experiments Detectors in NuWro An example of usage: simula3on for ND280 near detector of the T2K experiment A set of samples prepared to study possibili3es of mul3- nucleon (np- nh, MEC) events selec3on NuWro has got implementa3ons of two mul3- nucleon models: Nieves and Mar3ni- Marteau Several samples generated in different regions of the detector and subsequently processed using full detector simula3on Output can be directly compared with data Analysis in progress beam ND280 geometry Vertex distribu,on (le1) of NuWro simulated events using the ND280 geometry (lec: full inner detector and right: FGD1 only - single scin3llator bars visible). The denser parts contain more ver3ces Flux Geometry Detectors in NuWro (2) NuWro neutrino interac3on genera3on ND280 NuWro simula3on workflow ND280 detector simula3on and reconstruc3on Analysis, comparison with data NuWro- generated samples are used in the T2K studies of np- nh contribu,on in ND280 tracker data For details, see Peter Sinclair s talk ND280 tracker events with 1 muon and 1 proton in TPC np- nh ccqe ccres An example event display (above) of a NuWro generated event (CCQE), a muon and a proton are visible (both are properly reconstructed) Above: an example of distribu,on that can be used for np- nh search cosine of angle between muon and proton (visible differences between CCQE and mec events) NuWro online NuWro online Introduction Multi-nucleon Detector geometry NuWro online Summary The on-line graphical interface for NuWro is now available: setting parameters running simulations making plots T. Golan and P. Przewłocki NuWro 14/ 16 NuWro online Introduction Multi-nucleon Detector geometry NuWro online Summary T. Golan and P. Przewłocki NuWro 14/ 16 NuWro online Introduction 1.Thesimulationisdoneonourserver Multi-nucleon Detector geometry NuWro online Summary 2.TheoutputROOTfileisstoredonourserver,butonecandownload it. T. Golan and P. Przewłocki NuWro 14/ 16 NuWro online Onecanusealreadydefinedtypesofchartsordefineitsown T. Golan and P. Przewłocki NuWro 15/ 16 Summary Introduction Multi-nucleon Detector geometry NuWro online Summary 1.NuWroisacompletetooltoanalyzethedata. 2. All major neutrino interaction types are included. 3. There are several models of two-body current contribution. 4.Therealisticbeamaswellasdetectorgeometrycanbeused. 5. There is a graphical on-line interface. T. Golan and P. Przewłocki NuWro 16/ 16
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