Muon Identification: QMUIDO

This routine is an ALPHA interface to the ALEPHLIB routine AMUID. It collects useful information from the banks HMAD, MCAD, and MUID.

For most users, who only look at the identification flag IDF, this routine is useless since this flag can be accessed with the statement function KMUIIF (see section 8.2.8). The only purpose of calling this routine is to look in more detail at the muon identification.

QMUIDO cannot be called when reading a Nano-Dst .

Input argument:

ITK

ALPHA track number of a charged reconstructed track.

Output arguments:

IRUN

No longer filled (needed for backwards compatability)

IBE

Bitmap of the planes EXPECTED to have fired in the HCAL

IBT

Bitmap of the planes which have fired in the HCAL

IM1

Number of associated muon chamber hits in the inner layer

IM2

Number of associated muon chamber hits in the outer layer

NEXP

Number of planes expected to have fired in the HCAL

NFIR

Number of planes fired in the HCAL

N10

Number of planes fired in the last ten expected HCAL planes

N03

Number of planes fired in the last three expected HCAL planes

XMULT

Excess hit multiplicity in the last ten planes on the HCAL

RAPP

Distance between track extrapolation and closest muon chamber hit in standard deviations (the distribution is only approximately normal)

ANG

Angle between track extrapolation and closest muon chamber hits in standard deviations (the distribution is only approximately normal). Only available for tracks with at least one muon chamber hit in each layer

ISHAD

Shadowing flag = 0 if track is not shadowed; otherwise it is the JULIA track number of the shadowing track.

SUDNT

Sum of HCAL hit to track residuals in the last 10 planes.

IDF

Official muon identification flag.

• = 1 if muon flagged only by HCAL
• = 2 if muon flagged only by MUON
• = 3 if muon flagged by both HCAL and MUON 3 is the .AND. of 1 and 2
• = 10 is one hit in each layer of MUON chambers but failing tight matching criteria
• = 11 is good HCAL pattern
• = 12 is one and only one MUON hit
• = 13 is good HCAL + one and only one muon
• = 14 is good HCAL + one hit in each layer
• = 15 is one hit in each layer of MUON chambers passing tight matching criteria
• = 0 not a muon
• = -1 to -15 as above but lost shadowing contest
IMCF
Monte Carlo true source of this track
• = 0 ambiguous or data
• = 1 primary b
• = 2 secondary c
• = 3 primary c
• = 4 b to tau
• = 5 other muon
• = 6 non decaying hadron or electron
• = 7 decay hadron
IER
No longer filled (needed for backwards compatability)