Obs2Jets

Description

Implements MN jets observables depending on the 2 Mueller-Navelet jets of the event. Definition of these observables:

• $p_{T,ave} = \frac{p_{T,FWD}+p_{T,BWD}}{2}$
• $p_{T,FWD}$ transverse momentum of the forward jet
• $p_{T,BWD}$ transverse momentum of the backward jet
• $p_{T,RatMN} = min \left( \frac{P_{T,FWD}}{P{T,BWD}} , \frac{P_{T,BWD}}{P{T,FWD}} \right)$
• $\pi - \Dela \phi$ is the azimuthal distance between the two Mueller-Navelet Jets (mind that the function Obs2Jets::DPhi() returns in fact $\pi - \Dela \phi$)
• $\cos\left( n \left( \pi - \Delta \phi \right) \right)$ with $n = 1,2,3,4,...$ (implemented in CosDPhi() which directly returns this observable)

#include <MuellerNavelet.h>

Collaboration diagram for Obs2Jets:

Public Member Functions
	Obs2Jets (const DAS::RecJet &Fwd, const DAS::RecJet &Bwd)
	Obs2Jets (const DAS::GenJet &Fwd, const DAS::GenJet &Bwd)
float	PtAve () const
float	PtFWD () const
float	PtBWD () const
float	PtRatMN () const
float	DEta () const
float	DPhi () const
float	CosDPhi (int n) const
size_t	size () const

Public Attributes
const float	weightFWD
const float	weightBWD
const float	weight

Private Attributes
std::vector< DAS::FourVector >	LeadingJets

Constructor & Destructor Documentation

Obs2Jets() [1/2]

Obs2Jets	(	const DAS::RecJet &	Fwd,
		const DAS::RecJet &	Bwd
	)

                                                          :
    weightFWD( Fwd.weights.front() ), weightBWD( Bwd.weights.front() ),
    weight(Fwd.weights.front() * Bwd.weights.front()),
    LeadingJets{Fwd.p4, Bwd.p4}
{
    LeadingJets.front() *= Fwd.scales.front();
    LeadingJets.back () *= Bwd.scales.front();
}

Obs2Jets() [2/2]

Obs2Jets	(	const DAS::GenJet &	Fwd,
		const DAS::GenJet &	Bwd
	)

                                                          :
    weightFWD( Fwd.weights.front() ), weightBWD( Bwd.weights.front() ),
    weight(Fwd.weights.front() * Bwd.weights.front()),
    LeadingJets{Fwd.p4, Bwd.p4}
{ }

Member Function Documentation

CosDPhi()

float CosDPhi

(

int

n

)

const

Parameters

n

order

{
    return TMath::Cos(n*DPhi());
}

DEta()

float DEta

(

)

const

{
    auto deta =  std::abs(LeadingJets.front().Eta() - LeadingJets.back().Eta());
    assert( deta > numeric_limits<float>::epsilon() );
    return deta;
}

DPhi()

float DPhi

(

)

const

{
    FourVector jet1 = LeadingJets.front();
    FourVector jet2 = LeadingJets.back ();
    using ROOT::Math::VectorUtil::DeltaPhi;
    float dphi = DeltaPhi(jet1,jet2);
    float sign = std::abs(dphi) / dphi;
    dphi -= sign * M_PI;
    return dphi;
}

PtAve()

float PtAve

(

)

const

{
    return .5*( LeadingJets.front().Pt() + LeadingJets.back().Pt() );
}

PtBWD()

float PtBWD

(

)

const

{
    return LeadingJets.front().Pt();
}

PtFWD()

float PtFWD

(

)

const

{
    return LeadingJets.front().Pt();
}

PtRatMN()

float PtRatMN

(

)

const

{
    float pt1 = LeadingJets.front().Pt();
    float pt2 = LeadingJets.back ().Pt();
    if (pt1 >= pt2) swap(pt1,pt2);
    assert( pt2 > 0 );
    return pt1/pt2;
}

size()

size_t size

(

)

const

{ return 2; }

Member Data Documentation

LeadingJets

std::vector<DAS::FourVector> LeadingJets

private

The most forward and the most backward jets. The size is always 2 and and the type is taken in consistency with ObsMiniJets.

weight

const float weight

product of weightFWD and weightBWD

weightBWD

const float weightBWD

weight of the most backward jet

weightFWD

const float weightFWD

weight of the most forward jet

---

The documentation for this struct was generated from the following files:

• /builds/cms-analysis/general/DasAnalysisSystem/Core/Installer/Core/JetObservables/interface/MuellerNavelet.h
• /builds/cms-analysis/general/DasAnalysisSystem/Core/Installer/Core/JetObservables/src/MuellerNavelet.cc