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Grid/Hadrons/Modules/MContraction/SigmaToNucleonEye.hpp

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: Hadrons/Modules/MContraction/SigmaToNucleonEye.hpp
Copyright (C) 2015-2019
Author: Antonin Portelli <antonin.portelli@me.com>
Author: Felix Erben <felix.erben@ed.ac.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/* END LEGAL */
#ifndef Hadrons_MContraction_SigmaToNucleonEye_hpp_
#define Hadrons_MContraction_SigmaToNucleonEye_hpp_
#include <Hadrons/Global.hpp>
#include <Hadrons/Module.hpp>
#include <Hadrons/ModuleFactory.hpp>
#include <Grid/qcd/utils/BaryonUtils.h>
BEGIN_HADRONS_NAMESPACE
/******************************************************************************
* SigmaToNucleonEye *
******************************************************************************/
/*
* Sigma-to-nucleon 3-pt diagrams, eye topologies.
*
* Schematics: qq_loop |
* /-<-¬ |
* / \ | qs_xi G qd_xf
* \ / | /----<------*------<----¬
* qs_xi \ / qd_xf | / /-*-¬ \
* /-----<-----* *-----<----¬ | / / G \ \
* * G G * | * \ / qq_loop *
* |\ /| | |\ \->-/ /|
* | \ / | | | \ / |
* | \---------->---------/ | | | \----------->----------/ |
* \ qu_spec / | \ qu_spec /
* \ / | \ /
* \---------->---------/ | \----------->----------/
* qu_spec | qu_spec
*
* analogously to the rare-kaon naming, the left diagram is named 'one-trace' and
* the diagram on the right 'two-trace'
*
* Propagators:
* * qq_loop
* * qu_spec, source at xi
* * qd_xf, source at xf
* * qs_xi, source at xi
*/
BEGIN_MODULE_NAMESPACE(MContraction)
class SigmaToNucleonEyePar: Serializable
{
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(SigmaToNucleonEyePar,
std::string, qq_loop,
std::string, qu_spec,
std::string, qd_xf,
std::string, qs_xi,
unsigned int, xf,
std::string, parity,
std::string, sink,
std::string, output);
};
template <typename FImpl1, typename FImpl2, typename FImpl3, typename FImpl4>
class TSigmaToNucleonEye: public Module<SigmaToNucleonEyePar>
{
public:
FERM_TYPE_ALIASES(FImpl1, 1);
FERM_TYPE_ALIASES(FImpl2, 2);
FERM_TYPE_ALIASES(FImpl3, 3);
FERM_TYPE_ALIASES(FImpl3, 4);
BASIC_TYPE_ALIASES(ScalarImplCR, Scalar);
SINK_TYPE_ALIASES(Scalar);
typedef typename SpinMatrixField1::vector_object::scalar_object SpinMatrix;
class Metadata: Serializable
{
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(Metadata,
Gamma::Algebra, gamma_H,
Gamma::Algebra, gammaA_sigma,
Gamma::Algebra, gammaB_sigma,
Gamma::Algebra, gammaA_nucl,
Gamma::Algebra, gammaB_nucl,
int, trace,
int, parity);
};
typedef Correlator<Metadata, SpinMatrix> Result;
public:
// constructor
TSigmaToNucleonEye(const std::string name);
// destructor
virtual ~TSigmaToNucleonEye(void) {};
// dependency relation
virtual std::vector<std::string> getInput(void);
virtual std::vector<std::string> getOutput(void);
protected:
// setup
virtual void setup(void);
// execution
virtual void execute(void);
// Which gamma algebra was specified
Gamma::Algebra al;
};
MODULE_REGISTER_TMP(SigmaToNucleonEye, ARG(TSigmaToNucleonEye<FIMPL, FIMPL, FIMPL, FIMPL>), MContraction);
/******************************************************************************
* TSigmaToNucleonEye implementation *
******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3, typename FImpl4>
TSigmaToNucleonEye<FImpl1, FImpl2, FImpl3, FImpl4>::TSigmaToNucleonEye(const std::string name)
: Module<SigmaToNucleonEyePar>(name)
{}
// dependencies/products ///////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3, typename FImpl4>
std::vector<std::string> TSigmaToNucleonEye<FImpl1, FImpl2, FImpl3, FImpl4>::getInput(void)
{
std::vector<std::string> input = {par().qq_loop, par().qu_spec, par().qd_xf, par().qs_xi, par().sink};
return input;
}
template <typename FImpl1, typename FImpl2, typename FImpl3, typename FImpl4>
std::vector<std::string> TSigmaToNucleonEye<FImpl1, FImpl2, FImpl3, FImpl4>::getOutput(void)
{
std::vector<std::string> out = {};
return out;
}
// setup ///////////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3, typename FImpl4>
void TSigmaToNucleonEye<FImpl1, FImpl2, FImpl3, FImpl4>::setup(void)
{
envTmpLat(SpinMatrixField1, "c");
}
// execution ///////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2, typename FImpl3, typename FImpl4>
void TSigmaToNucleonEye<FImpl1, FImpl2, FImpl3, FImpl4>::execute(void)
{
const int parity {par().parity.size()>0 ? std::stoi(par().parity) : 1};
const Gamma GammaB(Gamma::Algebra::SigmaXZ); // C*gamma_5
const Gamma Id(Gamma::Algebra::Identity); // C*gamma_5
LOG(Message) << "Computing sigma-to-nucleon contractions '" << getName() << "'" << std::endl;
LOG(Message) << "' with (Gamma^A,Gamma^B)_sigma = ( Identity, C*gamma_5 ) and (Gamma^A,Gamma^B)_nucl = ( Identity, C*gamma_5 )" << std::endl;
LOG(Message) << "and parity " << parity << " using sink " << par().sink << "." << std::endl;
envGetTmp(SpinMatrixField1, c);
std::vector<SpinMatrix> buf;
std::vector<Result> result;
Result r;
r.info.parity = parity;
r.info.gammaA_sigma = Id.g;
r.info.gammaB_sigma = GammaB.g;
r.info.gammaA_nucl = Id.g;
r.info.gammaB_nucl = GammaB.g;
auto &qq_loop = envGet(PropagatorField1, par().qq_loop);
auto &qu_spec = envGet(SlicedPropagator2, par().qu_spec);
auto &qd_xf = envGet(PropagatorField3, par().qd_xf);
auto &qs_xi = envGet(PropagatorField4, par().qs_xi);
auto qut = qu_spec[par().xf];
for (auto &G: Gamma::gall)
{
r.info.gamma_H = G.g;
//Operator Q1, equivalent to the two-trace case in the rare-kaons module
c=Zero();
BaryonUtils<FIMPL>::Sigma_to_Nucleon_Eye(qq_loop,qut,qd_xf,qs_xi,G,GammaB,GammaB,parity,"Q1",c);
sliceSum(c,buf,Tp);
r.corr.clear();
for (unsigned int t = 0; t < buf.size(); ++t)
{
r.corr.push_back(buf[t]);
}
r.info.trace = 2;
result.push_back(r);
//Operator Q2, equivalent to the one-trace case in the rare-kaons module
c=Zero();
BaryonUtils<FIMPL>::Sigma_to_Nucleon_Eye(qq_loop,qut,qd_xf,qs_xi,G,GammaB,GammaB,parity,"Q2",c);
sliceSum(c,buf,Tp);
r.corr.clear();
for (unsigned int t = 0; t < buf.size(); ++t)
{
r.corr.push_back(buf[t]);
}
r.info.trace = 1;
result.push_back(r);
}
saveResult(par().output, "StN_Eye", result);
}
END_MODULE_NAMESPACE
END_HADRONS_NAMESPACE
#endif // Hadrons_MContraction_SigmaToNucleonEye_hpp_
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