Dijet Mass and Calibration1 H C A L Z(700) Data and Calibration Dan Green Fermilab June, 2001.

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Presentation transcript:

Dijet Mass and Calibration1 H C A L Z(700) Data and Calibration Dan Green Fermilab June, 2001

Dijet Mass and Calibration2 H C A L Dijet LEGO Plot - Full Z’(700) events - full LEGO plot and tracker correlation. Jet 1 is largely hadronic.

Dijet Mass and Calibration3 H C A L Zoom to R = 0.5 Structure of Jet1 in ECAL, HCAL, and tracker correlation. Attempt to resolve individual pions/photons. ECAL is very finely grained.

Dijet Mass and Calibration4 H C A L Clustering in ECAL + HCAL Start in ECAL - seed > 0.2 GeV. Add ECAL clusters for R 0.1 GeV. Then, look in HCAL, 3 x 3 (0.125) behind. Call the result a pion interacting in ECAL (flag = 1) if HCAL energy > 0.5 x ECAL energy, else a photon (flag = 0). For HCAL seed has ET > 0.2 GeV and cluster R < ( 3 x 3).

Dijet Mass and Calibration5 H C A L # Towers in a Cluster High ET clusters have a “large” number of towers. Low ET are limited to 1 or 2 towers in both ECAL and HCAL.

Dijet Mass and Calibration6 H C A LClustersClusters For found clusters, if there is ECAL and HCAL energy, then ~ 1/2 is in ECAL.

Dijet Mass and Calibration7 H C A L Flags of Clusters

Dijet Mass and Calibration8 H C A L Zoom in R < 0.5, Clustering Clustering is needed to correct for different calibrations which depend on the choice of photon or pion. Jet 1 is confirmed to be largely hadronic.

Dijet Mass and Calibration9 H C A L Clusters in a Jet A jet with R = 0.7 has ~ 200 HCAL towers. The number of clusters in the jet is = 32. The average cluster has 1.1 HCAL towers. Thus the occupation is fairly sparse.

Dijet Mass and Calibration10 H C A L Missing Energy - Cluster/Calibrate = 32.7 GeV -- > 31.9 GeV. = 630 GeV. Calibration using the single particle test beam procedure leads to only marginal improvement.

Dijet Mass and Calibration11 H C A L Jet Seed Look for maximum ET in HCAL. That cluster is a “seed” for the jet. Jet kinematics is defined by a cone centered on the seed as jet axis.

Dijet Mass and Calibration12 H C A L Jet Finding and R Choice With no pileup events, a cone radius of R = 0.7 is used.

Dijet Mass and Calibration13 H C A L Dijets - ET Use assumed calibration for ECAL and HCAL. There are some rather badly measured dijet masses. Low mass can be gluon radiation, but high mass is due to mismeasures. The kinematic maximum is M/2 of 350 GeV.

Dijet Mass and Calibration14 H C A L Dijets - Jet Mass = 0 ? Treat clusters as massless particles. This means that the jet has a mass.

Dijet Mass and Calibration15 H C A L Dijet Mass Clustered/calibratedET of Jet 3 < 50 GeV

Dijet Mass and Calibration16 H C A L Dijet Mass and Third jet Third Jet is searched for and those with ETJ3 > 50 GeV are removed. This cut removes some major mismeasures of mass.

Dijet Mass and Calibration17 H C A L Next Steps Calibration does not appear to be the major cause of jet resolution. At high mass, the typical particle energy in a jet is still rather small. Magnetic field sweeping must be taken into account. Poor resolution at low momentum can be addressed using the tracking information.

Dijet Mass and Calibration18 H C A L Track/Calor Cluster Number of clusters and number of tracks are well correlated, as is the sum of PT and ET.

Dijet Mass and Calibration19 H C A L Match in y, phi, ET dy and dphi have peaks at 0 with widths in units. Cut on |dy /0.087| < 1 and |dphi /0.087 < 1.5. Peak in PT-ET / 100% sqrt(PT) is evident.

Dijet Mass and Calibration20 H C A L Z(700) - Track/Cal Match Match simultaneously in y, phi and ET. Note that ET is systematically < PT

Dijet Mass and Calibration21 H C A L Replace Clusters -> Tracks Only ~ 50 tracks in |y| 1 GeV. Of those only ~ 15 match to calorimeter clusters in y, phi, and ET.

Dijet Mass and Calibration22 H C A L Replace Core, R < 0.13?

Dijet Mass and Calibration23 H C A L Core - Clusters, flg > 0