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PYTHIA
8.312
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This class holds info on a single particle species. More...
#include <ParticleData.h>
Public Member Functions | |
| ParticleDataEntry (int idIn=0, string nameIn=" ", int spinTypeIn=0, int chargeTypeIn=0, int colTypeIn=0, double m0In=0., double mWidthIn=0., double mMinIn=0., double mMaxIn=0., double tau0In=0., bool varWidthIn=false) | |
| Constructors: for antiparticle exists or not. | |
| ParticleDataEntry (int idIn, string nameIn, string antiNameIn, int spinTypeIn=0, int chargeTypeIn=0, int colTypeIn=0, double m0In=0., double mWidthIn=0., double mMinIn=0., double mMaxIn=0., double tau0In=0., bool varWidthIn=false) | |
| ParticleDataEntry (const ParticleDataEntry &oldPDE) | |
| Copy constructor. | |
| ParticleDataEntry & | operator= (const ParticleDataEntry &oldPDE) |
| Assignment operator. | |
| void | setDefaults () |
| Initialization of some particle flags. More... | |
| void | initPtr (ParticleData *particleDataPtrIn) |
| Store pointer to whole particle data table/database. | |
| void | setAll (string nameIn, string antiNameIn, int spinTypeIn=0, int chargeTypeIn=0, int colTypeIn=0, double m0In=0., double mWidthIn=0., double mMinIn=0., double mMaxIn=0., double tau0In=0., bool varWidthIn=false) |
| Reset all the properties of an existing particle. | |
| void | setName (string nameIn) |
| void | setAntiName (string antiNameIn) |
| void | setNames (string nameIn, string antiNameIn) |
| void | setSpinType (int spinTypeIn) |
| void | setChargeType (int chargeTypeIn) |
| void | setColType (int colTypeIn) |
| void | setM0 (double m0In) |
| void | setMWidth (double mWidthIn, bool countAsChanged=true) |
| void | setMMin (double mMinIn) |
| void | setMMax (double mMaxIn) |
| void | setMMinNoChange (double mMinIn) |
| Special options specifically when cutting wings of Breit-Wigners. | |
| void | setMMaxNoChange (double mMaxIn) |
| void | setTau0 (double tau0In, bool countAsChanged=true) |
| void | setVarWidth (bool varWidthIn) |
| void | setIsResonance (bool isResonanceIn) |
| void | setMayDecay (bool mayDecayIn, bool countAsChanged=true) |
| void | setTauCalc (bool tauCalcIn, bool countAsChanged=true) |
| void | setDoExternalDecay (bool doExternalDecayIn) |
| void | setIsVisible (bool isVisibleIn) |
| void | setDoForceWidth (bool doForceWidthIn) |
| void | setHasChanged (bool hasChangedIn) |
| int | id () const |
| Give back current values. | |
| int | antiId () const |
| bool | hasAnti () const |
| string | name (int idIn=1) const |
| int | spinType () const |
| int | chargeType (int idIn=1) const |
| double | charge (int idIn=1) const |
| int | colType (int idIn=1) const |
| double | m0 () const |
| double | mWidth () const |
| double | mMin () const |
| double | mMax () const |
| double | m0Min () const |
| double | m0Max () const |
| double | tau0 () const |
| bool | isResonance () const |
| bool | varWidth () const |
| bool | mayDecay () const |
| bool | tauCalc () const |
| bool | doExternalDecay () const |
| bool | isVisible () const |
| bool | doForceWidth () const |
| bool | hasChanged () const |
| bool | hasChangedMMin () const |
| bool | hasChangedMMax () const |
| void | initBWmass () |
| Set and give back several mass-related quantities. More... | |
| double | constituentMass () const |
| double | mSel () const |
| double | mRun (double mH) const |
| Function to calculate running mass at given mass scale. More... | |
| bool | useBreitWigner () const |
| Give back other quantities. | |
| bool | canDecay () const |
| bool | isLepton () const |
| bool | isQuark () const |
| bool | isGluon () const |
| bool | isDiquark () const |
| bool | isParton () const |
| Identify Hidden Valley partons as partons. | |
| bool | isHadron () const |
| bool | isMeson () const |
| bool | isBaryon () const |
| bool | isOnium () const |
| Find out if a particle is quarkonia. | |
| bool | isExotic () const |
| bool | isOctetHadron () const |
| Intermediate octet ccbar or bbar states in colour-octet model. | |
| int | heaviestQuark (int idIn=1) const |
| Extract the heaviest (= largest id) quark in a hadron. More... | |
| int | baryonNumberType (int idIn=1) const |
| Calculate three times baryon number, i.e. net quark - antiquark number. More... | |
| int | nQuarksInCode (int idQIn) const |
| void | clearChannels () |
| Reset to empty decay table. | |
| void | addChannel (int onMode=0, double bRatio=0., int meMode=0, int prod0=0, int prod1=0, int prod2=0, int prod3=0, int prod4=0, int prod5=0, int prod6=0, int prod7=0) |
| Add a decay channel to the decay table. | |
| int | sizeChannels () const |
| Decay table size. | |
| DecayChannel & | channel (int i) |
| Gain access to a channel in the decay table. | |
| const DecayChannel & | channel (int i) const |
| void | rescaleBR (double newSumBR=1.) |
| Rescale sum of branching ratios to unity. More... | |
| bool | preparePick (int idSgn, double mHat=0., int idInFlav=0) |
| Random choice of decay channel according to branching ratios. More... | |
| DecayChannel & | pickChannel () |
| Pick a decay channel according to branching ratios from preparePick. More... | |
| void | setResonancePtr (ResonanceWidthsPtr resonancePtrIn) |
| Access methods stored in ResonanceWidths. | |
| ResonanceWidthsPtr | getResonancePtr () |
| void | resInit (Info *infoPtrIn) |
| double | resWidth (int idSgn, double mHat, int idIn=0, bool openOnly=false, bool setBR=false) |
| double | resWidthOpen (int idSgn, double mHat, int idIn=0) |
| double | resWidthStore (int idSgn, double mHat, int idIn=0) |
| double | resOpenFrac (int idSgn) |
| double | resWidthRescaleFactor () |
| double | resWidthChan (double mHat, int idAbs1=0, int idAbs2=0) |
This class holds info on a single particle species.
| int baryonNumberType | ( | int | idIn = 1 | ) | const |
Calculate three times baryon number, i.e. net quark - antiquark number.
Quarks.
Diquarks
Baryons.
Done.
| int heaviestQuark | ( | int | idIn = 1 | ) | const |
Extract the heaviest (= largest id) quark in a hadron.
Meson.
Baryon.
Done.
| void initBWmass | ( | ) |
Set and give back several mass-related quantities.
Prepare the Breit-Wigner mass selection by precalculating frequently-used expressions.
Optionally set decay vertices also for short-lived particles. (Lifetimes are explicitly tabulated for long-lived ones.)
Find Breit-Wigner mode for current particle.
Find atan expressions to be used in random mass selection.
Done if no threshold factor.
Find average mass threshold for threshold-factor correction.
Switch off Breit-Wigner if very close to threshold.
| bool isBaryon | ( | ) | const |
Find out if a particle is a baryon. Covers normal hadrons and exotic hadrons with baryon number 1, but not e.g. R-hadrons.
Check that id has non-zero spin type and three quarks.
Catch pentaquarks of the form 9qqqqqs.
| bool isExotic | ( | ) | const |
Find out if particle is exotic hadron. Internally this is used to determine whether a particle can rescatter.
| bool isHadron | ( | ) | const |
Find out if a particle is a hadron. Only covers normal hadrons, not e.g. R-hadrons.
| bool isMeson | ( | ) | const |
Find out if a particle is a meson. Covers normal hadrons and exotic hadrons with baryon number 0, but not e.g. R-hadrons.
K_S and K_L are special.
Check that id has non-zero spin type and at least two quarks.
If id has three quarks, return true only for tetraquarks.
Otherwise it is a meson.
| double mRun | ( | double | mH | ) | const |
Function to calculate running mass at given mass scale.
Except for six quarks return nominal mass.
For d, u, s quarks start running at 2 GeV (RPP 2006 p. 505).
For c, b and t quarks start running at respective mass.
| double mSel | ( | ) | const |
Function to give mass of a particle, either at the nominal value or picked according to a (linear or quadratic) Breit-Wigner.
Nominal value. (Width check should not be needed, but just in case.)
Mass according to a Breit-Wigner linear in m.
Ditto, but make Gamma proportional to sqrt(m^2 - m_threshold^2).
Mass according to a Breit-Wigner quadratic in m.
Ditto, but m_0 Gamma_0 -> m Gamma(m) with threshold factor as above.
Done.
| int nQuarksInCode | ( | int | idQIn | ) | const |
Find number of quarks of given kind inside quark, diquark or hadron. Note: naive answer for flavour-diagonal meson mixing.
Do not keep track of sign.
Quarks.
Diquarks.
Mesons.
Baryons.
Done. Room for improvements e.g. w.r.t. R-hadrons.
| DecayChannel & pickChannel | ( | ) |
Pick a decay channel according to branching ratios from preparePick.
Find channel in table.
Emergency if no channel found. Done.
| bool preparePick | ( | int | idSgn, |
| double | mHat = 0., |
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| int | idInFlav = 0 |
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| ) |
Random choice of decay channel according to branching ratios.
Prepare to pick a decay channel.
Reset sum of allowed widths/branching ratios.
For resonances the widths are calculated dynamically.
Else use normal fixed branching ratios.
Failure if no channels found with positive branching ratios.
| void rescaleBR | ( | double | newSumBR = 1. | ) |
Rescale sum of branching ratios to unity.
Rescale all branching ratios to assure normalization to unity.
Sum up branching ratios. Find rescaling factor. Rescale.
| void resInit | ( | Info * | infoPtr | ) |
Access methods stored in ResonanceWidths. Could have been inline in .h, except for problems with forward declarations.
| void setDefaults | ( | ) |
Initialization of some particle flags.
Set initial default values for some quantities.
A particle is a resonance if it is heavy enough.
A particle may decay if it is shortlived enough.
A particle's lifetime is calculated from its decay width.
A particle by default has no external decays.
A particle is invisible if in current table of such.
Additionally all particles purely in Hidden Sector are invisible.
Normally a resonance should not have width forced to fixed value.
Set up constituent masses.
No Breit-Wigner mass selection before initialized. Status tau0.
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inline |
Change current values one at a time (or set if not set before). (Must use set here since else name+signature clash with get methods.)
1.8.11
