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HADRONS: 4pt Weak + current disconnected topology (e.g. for rare neutral kaon decays)

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Lanny91
2017-03-30 10:37:17 +01:00
parent c9dc22efa1
commit 2c81696fdd
4 changed files with 222 additions and 0 deletions
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1
extras/Hadrons/Modules.hpp
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@@ -35,6 +35,7 @@ See the full license in the file "LICENSE" in the top level distribution directo
#include <Grid/Hadrons/Modules/MContraction/WeakHamiltonian.hpp>
#include <Grid/Hadrons/Modules/MContraction/WeakHamiltonianEye.hpp>
#include <Grid/Hadrons/Modules/MContraction/WeakHamiltonianNonEye.hpp>
#include <Grid/Hadrons/Modules/MContraction/WeakNeutral4ptDisc.hpp>
#include <Grid/Hadrons/Modules/MGauge/Load.hpp>
#include <Grid/Hadrons/Modules/MGauge/Random.hpp>
#include <Grid/Hadrons/Modules/MGauge/Unit.hpp>

135
extras/Hadrons/Modules/MContraction/WeakNeutral4ptDisc.cc Normal file
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@@ -0,0 +1,135 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: extras/Hadrons/Modules/MContraction/WeakNeutral4ptDisc.cc
Copyright (C) 2017
Author: Andrew Lawson <andrew.lawson1991@gmail.com>
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 */
#include <Grid/Hadrons/Modules/MContraction/WeakNeutral4ptDisc.hpp>
using namespace Grid;
using namespace Hadrons;
using namespace MContraction;
/*
* Weak Hamiltonian + current contractions, disconnected topology for neutral
* mesons.
*
* These contractions are generated by operators Q_1,...,10 of the dS=1 Weak
* Hamiltonian in the physical basis and an additional current J (see e.g.
* Fig 11 of arXiv:1507.03094).
*
* Schematic:
*
* q2 q4 q3
* /--<--¬ /---<--¬ /---<--¬
* / \ / \ / \
* i * * H_W | J * * f
* \ / \ / \ /
* \--->---/ \-------/ \------/
* q1
*
* options
* - q1: input propagator 1 (string)
* - q2: input propagator 2 (string)
* - q3: input propagator 3 (string), assumed to be sequential propagator
* - q4: input propagator 4 (string), assumed to be a loop
*
* type 1: trace(q1*adj(q2)*g5*gL[mu])*trace(loop*gL[mu])*trace(q3*g5)
* type 2: trace(q1*adj(q2)*g5*gL[mu]*loop*gL[mu])*trace(q3*g5)
*/
/*******************************************************************************
* TWeakNeutral4ptDisc implementation *
******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
TWeakNeutral4ptDisc::TWeakNeutral4ptDisc(const std::string name)
: Module<WeakHamiltonianPar>(name)
{}
// dependencies/products ///////////////////////////////////////////////////////
std::vector<std::string> TWeakNeutral4ptDisc::getInput(void)
{
std::vector<std::string> in = {par().q1, par().q2, par().q3, par().q4};
return in;
}
std::vector<std::string> TWeakNeutral4ptDisc::getOutput(void)
{
std::vector<std::string> out = {getName()};
return out;
}
// setup ///////////////////////////////////////////////////////////////////////
void TWeakNeutral4ptDisc::setup(void)
{
}
// execution ///////////////////////////////////////////////////////////////////
void TWeakNeutral4ptDisc::execute(void)
{
LOG(Message) << "Computing Weak Hamiltonian neutral disconnected contractions '"
<< getName() << "' using quarks '" << par().q1 << "', '"
<< par().q2 << ", '" << par().q3 << "' and '" << par().q4
<< "'." << std::endl;
CorrWriter writer(par().output);
PropagatorField &q1 = *env().template getObject<PropagatorField>(par().q1);
PropagatorField &q2 = *env().template getObject<PropagatorField>(par().q2);
PropagatorField &q3 = *env().template getObject<PropagatorField>(par().q3);
PropagatorField &q4 = *env().template getObject<PropagatorField>(par().q4);
Gamma g5 = Gamma(Gamma::Algebra::Gamma5);
LatticeComplex expbuf(env().getGrid());
std::vector<TComplex> corrbuf;
std::vector<Result> result(n_neut_disc_diag);
unsigned int ndim = env().getNd();
PropagatorField tmp(env().getGrid());
std::vector<PropagatorField> meson(ndim, tmp);
std::vector<PropagatorField> loop(ndim, tmp);
LatticeComplex curr(env().getGrid());
// Setup for type 1 contractions.
for (int mu = 0; mu < ndim; ++mu)
{
meson[mu] = MAKE_DISC_MESON(q1, q2, GammaL(Gamma::gmu[mu]));
loop[mu] = MAKE_DISC_LOOP(q4, GammaL(Gamma::gmu[mu]));
}
curr = MAKE_DISC_CURR(q3, GammaL(Gamma::Algebra::Gamma5));
// Perform type 1 contractions.
SUM_MU(expbuf, trace(meson[mu]*loop[mu]))
expbuf *= curr;
MAKE_DIAG(expbuf, corrbuf, result[neut_disc_1_diag], "HW_disc0_1")
// Perform type 2 contractions.
SUM_MU(expbuf, trace(meson[mu])*trace(loop[mu]))
expbuf *= curr;
MAKE_DIAG(expbuf, corrbuf, result[neut_disc_2_diag], "HW_disc0_2")
write(writer, "HW_disc0", result);
}

84
extras/Hadrons/Modules/MContraction/WeakNeutral4ptDisc.hpp Normal file
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@@ -0,0 +1,84 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: extras/Hadrons/Modules/MContraction/WeakNeutral4ptDisc.hpp
Copyright (C) 2017
Author: Andrew Lawson <andrew.lawson1991@gmail.com>
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_WeakNeutral4ptDisc_hpp_
#define Hadrons_WeakNeutral4ptDisc_hpp_
#include <Grid/Hadrons/Modules/MContraction/WeakHamiltonian.hpp>
BEGIN_HADRONS_NAMESPACE
/******************************************************************************
* WeakNeutral4ptDisc *
******************************************************************************/
BEGIN_MODULE_NAMESPACE(MContraction)
enum
{
neut_disc_1_diag = 0,
neut_disc_2_diag = 1,
n_neut_disc_diag = 2
};
// Neutral 4pt disconnected subdiagram contractions.
#define MAKE_DISC_MESON(Q_1, Q_2, gamma) (Q_1*adj(Q_2)*g5*gamma)
#define MAKE_DISC_LOOP(Q_LOOP, gamma) (Q_LOOP*gamma)
#define MAKE_DISC_CURR(Q_c, gamma) (trace(Q_c*gamma))
class TWeakNeutral4ptDisc: public Module<WeakHamiltonianPar>
{
public:
TYPE_ALIASES(FIMPL,)
class Result: Serializable
{
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(Result,
std::string, name,
std::vector<Complex>, corr);
};
public:
// constructor
TWeakNeutral4ptDisc(const std::string name);
// destructor
virtual ~TWeakNeutral4ptDisc(void) = default;
// dependency relation
virtual std::vector<std::string> getInput(void);
virtual std::vector<std::string> getOutput(void);
// setup
virtual void setup(void);
// execution
virtual void execute(void);
};
MODULE_REGISTER_NS(WeakNeutral4ptDisc, TWeakNeutral4ptDisc, MContraction);
END_MODULE_NAMESPACE
END_HADRONS_NAMESPACE
#endif // Hadrons_WeakNeutral4ptDisc_hpp_

2
extras/Hadrons/modules.inc
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@@ -1,6 +1,7 @@
modules_cc =\
Modules/MContraction/WeakHamiltonianEye.cc \
Modules/MContraction/WeakHamiltonianNonEye.cc \
Modules/MContraction/WeakNeutral4ptDisc.cc \
Modules/MGauge/Load.cc \
Modules/MGauge/Random.cc \
Modules/MGauge/Unit.cc
@@ -15,6 +16,7 @@ modules_hpp =\
Modules/MContraction/WeakHamiltonian.hpp \
Modules/MContraction/WeakHamiltonianEye.hpp \
Modules/MContraction/WeakHamiltonianNonEye.hpp \
Modules/MContraction/WeakNeutral4ptDisc.hpp \
Modules/MGauge/Load.hpp \
Modules/MGauge/Random.hpp \
Modules/MGauge/Unit.hpp \