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219 lines
8.1 KiB
C++
219 lines
8.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Hadrons/Modules/MContraction/SigmaToNucleonEye.hpp
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Copyright (C) 2015-2019
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Author: Antonin Portelli <antonin.portelli@me.com>
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Author: Felix Erben <felix.erben@ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef Hadrons_MContraction_SigmaToNucleonEye_hpp_
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#define Hadrons_MContraction_SigmaToNucleonEye_hpp_
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#include <Hadrons/Global.hpp>
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#include <Hadrons/Module.hpp>
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#include <Hadrons/ModuleFactory.hpp>
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#include <Grid/qcd/utils/BaryonUtils.h>
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BEGIN_HADRONS_NAMESPACE
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/******************************************************************************
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* SigmaToNucleonEye *
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******************************************************************************/
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/*
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* Sigma-to-nucleon 3-pt diagrams, eye topologies.
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*
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* Schematics: qqLoop |
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* /->-¬ |
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* / \ | qsTi G qdTf
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* \ / | /---->------*------>----¬
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* qsTi \ / qdTf | / /-*-¬ \
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* /----->-----* *----->----¬ | / / G \ \
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* * G G * | * \ / qqLoop *
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* |\ /| | |\ \-<-/ /|
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* | \ / | | | \ / |
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* | \---------->---------/ | | | \----------->----------/ |
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* \ quSpec / | \ quSpec /
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* \ / | \ /
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* \---------->---------/ | \----------->----------/
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* quSpec | quSpec
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*
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* analogously to the rare-kaon naming, the left diagram is named 'one-trace' and
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* the diagram on the right 'two-trace'
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*
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* Propagators:
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* * qqLoop
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* * quSpec, source at ti
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* * qdTf, source at tf
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* * qsTi, source at ti
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*/
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BEGIN_MODULE_NAMESPACE(MContraction)
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class SigmaToNucleonEyePar: Serializable
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{
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public:
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GRID_SERIALIZABLE_CLASS_MEMBERS(SigmaToNucleonEyePar,
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std::string, qqLoop,
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std::string, quSpec,
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std::string, qdTf,
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std::string, qsTi,
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unsigned int, tf,
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std::string, sink,
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std::string, output);
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};
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template <typename FImpl>
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class TSigmaToNucleonEye: public Module<SigmaToNucleonEyePar>
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{
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public:
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FERM_TYPE_ALIASES(FImpl,);
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BASIC_TYPE_ALIASES(ScalarImplCR, Scalar);
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SINK_TYPE_ALIASES(Scalar);
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typedef typename SpinMatrixField::vector_object::scalar_object SpinMatrix;
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class Metadata: Serializable
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{
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public:
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GRID_SERIALIZABLE_CLASS_MEMBERS(Metadata,
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Gamma::Algebra, gammaH,
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Gamma::Algebra, gammaASigma,
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Gamma::Algebra, gammaBSigma,
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Gamma::Algebra, gammaANucl,
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Gamma::Algebra, gammaBNucl,
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int, trace);
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};
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typedef Correlator<Metadata, SpinMatrix> Result;
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public:
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// constructor
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TSigmaToNucleonEye(const std::string name);
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// destructor
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virtual ~TSigmaToNucleonEye(void) {};
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// dependency relation
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virtual std::vector<std::string> getInput(void);
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virtual std::vector<std::string> getOutput(void);
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protected:
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// setup
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virtual void setup(void);
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// execution
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virtual void execute(void);
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// Which gamma algebra was specified
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Gamma::Algebra al;
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};
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MODULE_REGISTER_TMP(SigmaToNucleonEye, ARG(TSigmaToNucleonEye<FIMPL>), MContraction);
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/******************************************************************************
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* TSigmaToNucleonEye implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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template <typename FImpl>
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TSigmaToNucleonEye<FImpl>::TSigmaToNucleonEye(const std::string name)
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: Module<SigmaToNucleonEyePar>(name)
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{}
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// dependencies/products ///////////////////////////////////////////////////////
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template <typename FImpl>
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std::vector<std::string> TSigmaToNucleonEye<FImpl>::getInput(void)
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{
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std::vector<std::string> input = {par().qqLoop, par().quSpec, par().qdTf, par().qsTi, par().sink};
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return input;
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}
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template <typename FImpl>
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std::vector<std::string> TSigmaToNucleonEye<FImpl>::getOutput(void)
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{
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std::vector<std::string> out = {};
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return out;
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}
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// setup ///////////////////////////////////////////////////////////////////////
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template <typename FImpl>
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void TSigmaToNucleonEye<FImpl>::setup(void)
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{
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envTmpLat(SpinMatrixField, "c");
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}
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// execution ///////////////////////////////////////////////////////////////////
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template <typename FImpl>
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void TSigmaToNucleonEye<FImpl>::execute(void)
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{
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const Gamma GammaB(Gamma::Algebra::SigmaXZ); // C*gamma_5
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const Gamma Id(Gamma::Algebra::Identity); // C*gamma_5
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LOG(Message) << "Computing sigma-to-nucleon contractions '" << getName() << "'" << std::endl;
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LOG(Message) << "' with (Gamma^A,Gamma^B)_sigma = ( Identity, C*gamma_5 ) and (Gamma^A,Gamma^B)_nucl = ( Identity, C*gamma_5 )" << std::endl;
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LOG(Message) << " using sink " << par().sink << "." << std::endl;
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envGetTmp(SpinMatrixField, c);
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std::vector<SpinMatrix> buf;
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std::vector<Result> result;
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Result r;
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r.info.gammaASigma = Id.g;
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r.info.gammaBSigma = GammaB.g;
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r.info.gammaANucl = Id.g;
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r.info.gammaBNucl = GammaB.g;
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auto &qqLoop = envGet(PropagatorField, par().qqLoop);
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auto &quSpec = envGet(SlicedPropagator, par().quSpec);
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auto &qdTf = envGet(PropagatorField, par().qdTf);
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auto &qsTi = envGet(PropagatorField, par().qsTi);
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auto qut = quSpec[par().tf];
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for (auto &G: Gamma::gall)
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{
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r.info.gammaH = G.g;
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//Operator Q1, equivalent to the two-trace case in the rare-kaons module
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c=Zero();
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BaryonUtils<FIMPL>::Sigma_to_Nucleon_Eye(qqLoop,qut,qdTf,qsTi,G,GammaB,GammaB,"Q1",c);
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sliceSum(c,buf,Tp);
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r.corr.clear();
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for (unsigned int t = 0; t < buf.size(); ++t)
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{
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r.corr.push_back(buf[t]);
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}
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r.info.trace = 2;
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result.push_back(r);
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//Operator Q2, equivalent to the one-trace case in the rare-kaons module
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c=Zero();
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BaryonUtils<FIMPL>::Sigma_to_Nucleon_Eye(qqLoop,qut,qdTf,qsTi,G,GammaB,GammaB,"Q2",c);
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sliceSum(c,buf,Tp);
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r.corr.clear();
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for (unsigned int t = 0; t < buf.size(); ++t)
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{
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r.corr.push_back(buf[t]);
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}
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r.info.trace = 1;
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result.push_back(r);
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}
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saveResult(par().output, "stnEye", result);
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}
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END_MODULE_NAMESPACE
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END_HADRONS_NAMESPACE
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#endif // Hadrons_MContraction_SigmaToNucleonEye_hpp_
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