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diff --git a/Models/LHTP/LHTPModel.cc b/Models/LHTP/LHTPModel.cc
--- a/Models/LHTP/LHTPModel.cc
+++ b/Models/LHTP/LHTPModel.cc
@@ -1,266 +1,302 @@
// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the LHTPModel class.
//
#include "LHTPModel.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Utilities/DescribeClass.h"
+#include "ThePEG/Interface/Switch.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/ParVector.h"
#include "ThePEG/Interface/RefVector.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "gsl/gsl_multiroots.h"
#include "ThePEG/Repository/CurrentGenerator.h"
#include <algorithm>
using namespace Herwig;
using namespace ThePEG;
// equations for top parameters for GSL
namespace {
// struct to provide the model parameters to the functions
struct tparams {
Energy v;
Energy f;
Energy mt;
double tan2a;
};
// equations defining tan 2alpha and mt expressed in form f(lambda1,lambda2)=0
// to be solved to give lambda1 and lambda2 by gsl
int top_equation(const gsl_vector * x, void *params, gsl_vector *f ) {
// yukawa and check top mass
const double lam1 = gsl_vector_get(x,0);
const double lam2 = gsl_vector_get(x,1);
Energy fs = ((struct tparams *) params)->f;
Energy v = ((struct tparams *) params)->v;
double sv = sin(sqrt(2.)*v/fs);
double cv = cos(sqrt(2.)*v/fs);
Energy mt = ((struct tparams *) params)->mt;
double tan2a = ((struct tparams *) params)->tan2a;
double f1 = 4.*lam1*lam2*(1.+cv)/(4.*sqr(lam2)-sqr(lam1)*(2.*sqr(sv)+sqr(1.+cv)))
-tan2a;
double delta = 0.5*(sqr(lam2)+0.5*sqr(lam1)*(sqr(sv)+0.5*sqr(1.+cv)));
double f2 = sqr(fs/mt)*delta*(1.-sqrt(1.-0.5*sqr(lam1*lam2*sv/delta)))-1.;
if(lam1*lam2<0.) f1+=1e10;
if(lam1*lam2<0.) f2+=1e10;
gsl_vector_set(f,0,f1);
gsl_vector_set(f,1,f2);
return GSL_SUCCESS;
}
}
LHTPModel::LHTPModel()
- : f_(0.5*TeV), salpha_(sqrt(0.5)), calpha_(sqrt(0.5)), sbeta_(0.), cbeta_(0.),
- kappaQuark_(1.), kappaLepton_(1.), mh_(120.*GeV), v_(246.*GeV),
- g_(sqrt(0.43)), gp_(sqrt(0.12))
+ : f_(0.5*TeV), salpha_(sqrt(0.5)), calpha_(sqrt(0.5)), sbeta_(0.), cbeta_(0.),
+ sL_(0.), cL_(1.), sR_(0.), cR_(0.),
+ kappaQuark_(1.), kappaLepton_(1.), mh_(125.*GeV), v_(246.*GeV),
+ g_(sqrt(0.43)), gp_(sqrt(0.12)), approximate_(false)
{}
IBPtr LHTPModel::clone() const {
return new_ptr(*this);
}
IBPtr LHTPModel::fullclone() const {
return new_ptr(*this);
}
void LHTPModel::persistentOutput(PersistentOStream & os) const {
os << ounit(f_,TeV) << salpha_ << calpha_ << sbeta_ << cbeta_
<< kappaQuark_ << kappaLepton_ << ounit(v_,GeV)
- << g_ << gp_ << sthetaH_ << cthetaH_;
+ << g_ << gp_ << sthetaH_ << cthetaH_ << approximate_
+ << sL_ << cL_ << sR_ << cR_;
}
void LHTPModel::persistentInput(PersistentIStream & is, int) {
is >> iunit(f_,TeV) >> salpha_ >> calpha_ >> sbeta_ >> cbeta_
- >> kappaQuark_ >> kappaLeptopn_>> iunit(v_,GeV)
- >> g_ >> gp_ >> sthetaH_ >> cthetaH_;
+ >> kappaQuark_ >> kappaLepton_>> iunit(v_,GeV)
+ >> g_ >> gp_ >> sthetaH_ >> cthetaH_ >> approximate_
+ >> sL_ >> cL_ >> sR_ >> cR_;
}
// Static variable needed for the type description system in ThePEG.
DescribeClass<LHTPModel,StandardModel>
describeHerwigLHTPModel("Herwig::LHTPModel", "HwLHTPModel.so");
void LHTPModel::Init() {
static ClassDocumentation<LHTPModel> documentation
("The LHTPModel class implements the Little Higgs model"
" with T-parity");
static Parameter<LHTPModel,Energy> interfacef
("f",
"The scale of the non-linear sigma-model",
&LHTPModel::f_, TeV, 1.*TeV, 0.0*TeV, 10.0*TeV,
true, false, Interface::limited);
static Parameter<LHTPModel,double> interfaceSinAlpha
("SinAlpha",
"The parameter controlling the mixing in the top quark sector of the model",
&LHTPModel::salpha_, sqrt(0.5), 0.0, 10.0,
false, false, Interface::limited);
static Parameter<LHTPModel,double> interfaceKappaQuark
("KappaQuark",
"The parameter controlling the masses of the T-odd quarks",
&LHTPModel::kappaQuark_, 1.0, 0.0, 10.0,
false, false, Interface::limited);
static Parameter<LHTPModel,double> interfaceKappaLepton
("KappaLepton",
"The parameter controlling the masses of the T-odd leptons",
&LHTPModel::kappaLepton_, 1.0, 0.0, 10.0,
false, false, Interface::limited);
static Parameter<LHTPModel,Energy> interfaceHiggsMass
("HiggsMass",
"The mass of the lightest Higgs boson",
&LHTPModel::mh_, GeV, 120.0*GeV, 100.0*GeV, 1000.0*GeV,
false, false, Interface::limited);
+
+ static Switch<LHTPModel,bool> interfaceApproximate
+ ("Approximate",
+ "Whether to use the full expression for the mases of the top quark"
+ " and its partners or the second-order expansion in v/f.",
+ &LHTPModel::approximate_, false, false, false);
+ static SwitchOption interfaceApproximateYes
+ (interfaceApproximate,
+ "Yes",
+ "Approximate",
+ true);
+ static SwitchOption interfaceApproximateNo
+ (interfaceApproximate,
+ "No",
+ "Don't approximate",
+ false);
+
}
void LHTPModel::doinit() {
StandardModel::doinit();
- string name = CurrentGenerator::current().filename() +
- string("-BSMModelInfo.out");
- ofstream dummy(name.c_str());
using Constants::pi;
// compute the parameters of the model
// W and Z masses
- Energy mw(getParticleData(ParticleID::Wplus)->mass()),
- mz(getParticleData(ParticleID::Z0)->mass());
+ Energy mw(getParticleData(ParticleID::Wplus)->mass());
+ Energy mz(getParticleData(ParticleID::Z0)->mass());
// couplings g and g'
double ee = sqrt(4.*pi*alphaEM(sqr(mz)));
- double sw2(sin2ThetaW()),cw2(1.-sin2ThetaW());
- double sw(sqrt(sw2)),cw(sqrt(cw2));
+ double sw(sqrt(sin2ThetaW())),cw(sqrt(1.-sin2ThetaW()));
g_ = ee/sw;
gp_ = ee/cw;
// vev
v_ = 2.*mw/g_;
double vf(sqr(v_/f_));
// calculate masses of the new particles from input
// and SM parameters
// masses of the new gauge bosons (MWH = MZH)
Energy MAH = gp_*f_*sqrt(0.2)*(1.-0.625*vf);
Energy MZH = g_ *f_* (1.-0.125*vf);
// mixings
sthetaH_ = 1.25*g_*gp_/(5.*sqr(g_)-sqr(gp_))*vf;
cthetaH_ = sqrt(1.-sqr(sthetaH_));
// masses of the new top quarks
Energy MTp,MTm;
topMixing(MTp,MTm);
+ // mixings in the top sector
+ sL_ = sqr(salpha_)*v_/f_;
+ cL_ = sqrt(1.-sqr(sL_));
+ sR_ = salpha_*(1.-0.5*sqr(calpha_)*(sqr(calpha_)-sqr(salpha_))*vf);
+ cR_ = sqrt(1.-sqr(sR_));
// masses of the T-odd fermions
Energy Mdm = sqrt(2.)*kappaQuark_ *f_;
Energy Mum = sqrt(2.)*kappaQuark_ *f_*(1.-0.125*vf);
Energy Mlm = sqrt(2.)*kappaLepton_*f_;
Energy Mnm = sqrt(2.)*kappaLepton_*f_*(1.-0.125*vf);
// masses of the triplet higgs
Energy MPhi = sqrt(2.)*mh_*f_/v_;
// set the masses of the new particles
// new gauge bosons
resetMass( 32 , MAH );
resetMass( 33 , MZH );
resetMass( 34 , MZH );
resetMass(-34 , MZH );
// masses of the new top quarks
resetMass( 8 , MTp );
resetMass( -8 , MTp );
resetMass( 4000008, MTm );
resetMass( -4000008, MTm );
// masses of the Higgs bosons
resetMass( 25 , mh_ );
resetMass( 35 , MPhi );
resetMass( 36 , MPhi );
resetMass( 37 , MPhi );
resetMass(-37 , MPhi );
resetMass( 38 , MPhi );
resetMass(-38 , MPhi );
// masses of the T-odd quarks
resetMass( 4000001, Mdm );
resetMass(-4000001, Mdm );
resetMass( 4000002, Mum );
resetMass(-4000002, Mum );
resetMass( 4000003, Mdm );
resetMass(-4000003, Mdm );
resetMass( 4000004, Mum );
resetMass(-4000004, Mum );
resetMass( 4000005, Mdm );
resetMass(-4000005, Mdm );
resetMass( 4000006, Mum );
resetMass(-4000006, Mum );
// masses of the T-odd leptons
resetMass( 4000011, Mlm );
resetMass(-4000011, Mlm );
resetMass( 4000012, Mnm );
resetMass(-4000012, Mnm );
resetMass( 4000013, Mlm );
resetMass(-4000013, Mlm );
resetMass( 4000014, Mnm );
resetMass(-4000014, Mnm );
resetMass( 4000015, Mlm );
resetMass(-4000015, Mlm );
resetMass( 4000016, Mnm );
resetMass(-4000016, Mnm );
}
void LHTPModel::topMixing(Energy & MTp, Energy & MTm) {
+ double vf(sqr(v_/f_));
Energy mt = getParticleData(ParticleID::t)->mass();
calpha_ = sqrt(1.-sqr(salpha_));
double sv(sin(sqrt(2.)*v_/f_)),cv(cos(sqrt(2.)*v_/f_));
- // first guess for Yukawa's based on leading order in v/f expansion
- double lambda1(mt/v_/calpha_), lambda2(mt/salpha_/v_);
- MTp = lambda1/salpha_*f_;
- MTm = lambda1/salpha_*calpha_*f_;
- // special case where denominator of tan 2 alpha eqn is zero
- if(abs(salpha_-sqrt(0.5))<1e-4) {
- double a = 0.25*(2.*sqr(sv)+sqr(1.+cv));
- double b = 0.5*(a+0.5*(sqr(sv)+0.5*sqr(1.+cv)));
- lambda1 = mt/f_*sqrt(1./b/(1.-sqrt(1-0.5*a*sqr(sv/b))));
- lambda2 = sqrt(a)*lambda1;
+ // first guess for Yukawa's based on second-order in v/f expansion
+ double lambda1 = mt/v_/calpha_*(1.+(2.-3.*pow(salpha_,4))*vf/6.);
+ double lambda2 = mt/v_/salpha_*(1.+(2.-3.*pow(calpha_,4))*vf/6.);
+ // first guess for masses
+ MTp = sqrt(sqr(lambda1)+sqr(lambda2))*f_*(1-0.5*vf*sqr(calpha_*salpha_));
+ MTm = lambda2*f_;
+ cerr << "before solve " << lambda1 << " " << lambda2 << "\n";
+ cerr << "testing masses MTm " << MTm/GeV << " MTp " << MTp/GeV << "\n";
+ double mtcorr = 0.25*(1.-2.*sqr(salpha_*calpha_))*vf;
+ cerr << "testing COMPHEP "
+ << mt/calpha_/v_*(1.+mtcorr) << " "
+ << mt/salpha_/v_*(1.+mtcorr) << "\n";
+ if(!approximate_) {
+ // special case where denominator of tan 2 alpha eqn is zero
+ if(abs(salpha_-sqrt(0.5))<1e-4) {
+ cerr << "testing did special case?\n";
+ double a = 0.25*(2.*sqr(sv)+sqr(1.+cv));
+ double b = 0.5*(a+0.5*(sqr(sv)+0.5*sqr(1.+cv)));
+ lambda1 = mt/f_*sqrt(1./b/(1.-sqrt(1.-0.5*a*sqr(sv/b))));
+ lambda2 = sqrt(a)*lambda1;
+ }
+ // general case using GSL
+ else {
+ double ca = sqrt(1.-sqr(salpha_));
+ double ta = salpha_/ca;
+ double tan2a = 2.*ta/(1.-sqr(ta));
+ const gsl_multiroot_fsolver_type *T;
+ gsl_multiroot_fsolver *s;
+ int status;
+ size_t iter=0;
+ const size_t n=2;
+ struct tparams p = {v_,f_,mt,tan2a};
+ gsl_multiroot_function f = {&top_equation, n, &p};
+ gsl_vector *x = gsl_vector_alloc(n);
+ gsl_vector_set(x,0,lambda1);
+ gsl_vector_set(x,1,lambda2);
+ T = gsl_multiroot_fsolver_hybrids;
+ s = gsl_multiroot_fsolver_alloc(T,2);
+ gsl_multiroot_fsolver_set(s, &f,x);
+ do {
+ iter++;
+ status = gsl_multiroot_fsolver_iterate(s);
+ if(status) break;
+ status = gsl_multiroot_test_residual(s->f,1e-7);
+ }
+ while (status==GSL_CONTINUE && iter < 1000);
+ gsl_multiroot_fsolver_free(s);
+ lambda1 = gsl_vector_get(s->x,0);
+ lambda2 = gsl_vector_get(s->x,1);
+ gsl_vector_free(x);
+ }
+ // calculate the heavy top masses using full result
+ double delta = 0.5*(sqr(lambda2)+0.5*sqr(lambda1)*(sqr(sv)+0.5*sqr(1.+cv)));
+ double det = sqrt(1.-0.5*sqr(lambda1*lambda2*sv/delta));
+ MTp = sqrt(sqr(f_)*delta*(1.+det));
+ MTm = lambda2*f_;
}
- // general case using GSL
- else {
- double ca = sqrt(1.-sqr(salpha_));
- double ta = salpha_/ca;
- double tan2a = 2.*ta/(1.-sqr(ta));
- const gsl_multiroot_fsolver_type *T;
- gsl_multiroot_fsolver *s;
- int status;
- size_t iter=0;
- const size_t n=2;
- struct tparams p = {v_,f_,mt,tan2a};
- gsl_multiroot_function f = {&top_equation, n, &p};
- gsl_vector *x = gsl_vector_alloc(n);
- gsl_vector_set(x,0,lambda1);
- gsl_vector_set(x,1,lambda2);
- T = gsl_multiroot_fsolver_hybrids;
- s = gsl_multiroot_fsolver_alloc(T,2);
- gsl_multiroot_fsolver_set(s, &f,x);
- do {
- iter++;
- status = gsl_multiroot_fsolver_iterate(s);
- if(status) break;
- status = gsl_multiroot_test_residual(s->f,1e-7);
- }
- while (status==GSL_CONTINUE && iter < 1000);
- gsl_multiroot_fsolver_free(s);
- lambda1 = gsl_vector_get(s->x,0);
- lambda2 = gsl_vector_get(s->x,1);
- gsl_vector_free(x);
- }
- // calculate the heavy top masses using full result
- double delta = 0.5*(sqr(lambda2)+0.5*sqr(lambda1)*(sqr(sv)+0.5*sqr(1.+cv)));
- double det = sqrt(1.-0.5*sqr(lambda1*lambda2*sv/delta));
- MTp = sqrt(sqr(f_)*delta*(1.+det));
- MTm = lambda2*f_;
// beta mixing angle
double beta = 0.5*atan(2.*sqrt(2.)*sqr(lambda1)*sv*(1.+cv)/
(4.*sqr(lambda2)+sqr(1.+cv)*sqr(lambda1)-2.*sqr(lambda1)*sv));
sbeta_ = sin(beta);
cbeta_ = cos(beta);
+ cerr << "testing after solve " << lambda1 << " " << lambda2 << "\n";
+ cerr << "testing masses MTm " << MTm/GeV << " MTp " << MTp/GeV << "\n";
}
diff --git a/Models/LHTP/LHTPModel.h b/Models/LHTP/LHTPModel.h
--- a/Models/LHTP/LHTPModel.h
+++ b/Models/LHTP/LHTPModel.h
@@ -1,230 +1,280 @@
// -*- C++ -*-
#ifndef THEPEG_LHTPModel_H
#define THEPEG_LHTPModel_H
//
// This is the declaration of the LHTPModel class.
//
#include "Herwig++/Models/StandardModel/StandardModel.h"
#include "LHTPModel.fh"
namespace Herwig {
/**
* The LHTPModel class is the main class for the
* implementation of the Little Higgs model with T-parity
*
* @see \ref LHTPModelInterfaces "The interfaces"
* defined for LHTPModel.
*/
class LHTPModel: public StandardModel {
public:
/**
* The default constructor.
*/
LHTPModel();
/**
* Access to the parameters of the model
*/
//@{
/**
* The vacuum expection value
*/
Energy vev() const { return v_; }
/**
* The \f$f\f$ scale of the non-linear \f$\sigma\f$-model
*/
Energy f() const { return f_; }
/**
* \f$\sin\alpha\f$
*/
double sinAlpha() const { return salpha_; }
/**
* \f$\cos\alpha\f$
*/
double cosAlpha() const { return calpha_; }
/**
* \f$\sin\beta\f$
*/
double sinBeta() const { return sbeta_; }
/**
* \f$\cos\beta\f$
*/
double cosBeta() const { return cbeta_; }
/**
* \f$\sin\theta_H\f$
*/
double sinThetaH() const { return sthetaH_; }
/**
* \f$\cos\theta_H\f$
*/
double cosThetaH() const { return cthetaH_; }
+
+ /**
+ * \f$\sin\theta_L\f$
+ */
+ double sinThetaL() const { return sL_;}
+
+ /**
+ * \f$\cos\theta_L\f$
+ */
+ double cosThetaL() const { return cL_;}
+
+ /**
+ * \f$\sin\theta_R\f$
+ */
+ double sinThetaR() const { return sR_;}
+
+ /**
+ * \f$\cos\theta_R\f$
+ */
+ double cosThetaR() const { return cR_;}
//@}
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
virtual IBPtr clone() const;
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
virtual IBPtr fullclone() const;
//@}
protected:
/**
* Calculate the mixing in the top sector of the model
* and the masses of the T-odd and T-even heavy tops
* The mixings are calculated by solving Eqns 2.22 and 2.24 of hep-ph/0506042
* for \f$\lambda_1$ and \f$\lambda_2\f$ given the input value of \f$\sin\alpha\f$
* and the top mass.
*/
void topMixing(Energy & MTp, Energy & MTm);
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
//@}
private:
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
LHTPModel & operator=(const LHTPModel &);
private:
/**
* The constant for the non-linear \f$\sigma\f$ model
*/
Energy f_;
/**
* @name The mixing in the top quark sector
*/
//@{
/**
* \f$\sin\alpha\f$, taken as an input
*/
double salpha_;
/**
* \f$\cos\alpha\f$
*/
double calpha_;
/**
* \f$\sin\beta\f$
*/
double sbeta_;
/**
* \f$\cos\beta\f$
*/
double cbeta_;
//@}
/**
* @name Mixing of the heavy photon and Z
*/
//@{
/**
* \f$\sin\theta_H\f$
*/
double sthetaH_;
/**
* \f$\cos\theta_H\f$
*/
double cthetaH_;
//@}
/**
+ * @name Mixings in the top sector
+ */
+ //@{
+ /**
+ * \f$\sin\theta_L\f$
+ */
+ double sL_;
+
+ /**
+ * \f$\cos\theta_L\f$
+ */
+ double cL_;
+
+ /**
+ * \f$\sin\theta_R\f$
+ */
+ double sR_;
+
+ /**
+ * \f$\cos\theta_R\f$
+ */
+ double cR_;
+ //@}
+
+ /**
* The \f$\kappa_q\f$ parameter which controls the properties of the
* T-odd quarks
*/
double kappaQuark_;
/**
* The \f$\kappa_\ell\f$ parameter which controls the properties of the
* T-odd leptons
*/
double kappaLepton_;
/**
* The mass of the Standard Model higgs
*/
Energy mh_;
/**
* The vacuum expection valve
*/
Energy v_;
/**
* The \f$g\f$ coupling
*/
double g_;
/**
* the \f$g'\f$ coupling
*/
double gp_;
+
+ /**
+ * Method for evaluating the masses
+ */
+ bool approximate_;
};
}
#endif /* THEPEG_LHTPModel_H */

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