Measurement of the jet fragmentation function and transverse profile in proton-proton collisions at a center-of-mass energy of 7 TeV with the ATLAS detector
The jet fragmentation function and transverse profile for jets with 25 GeV < ptJet < 500 GeV and etaJet<1.2 produced in proton-proton collisions with a center-of-mass energy of 7 TeV are presented. The measurement is performed using data with an integrated luminosity of 36 pb^-1. Jets are reconstructed and their momentum measured using calorimetric information. The momenta of the charged particle constituents are measured using the tracking system. The distributions corrected for detector effects are compared with various Monte Carlo event generators and generator tunes. Several of these choices show good agreement with the measured fragmentation function. None of these choices reproduce both the transverse profile and fragmentation function over the full kinematic range of the measurement.
27 September 2011
Contact: Standard Model conveners
internal
Figures
Figure 01a
Systematic uncertainty in F(z,ptJet) from uncertainties in the jet energy scale and resolution, the track reconstruction efficiency and momentum resolution and the response matrix for 25 GeV
png (62kB) eps (19kB) pdf (9kB)
Figure 01b
Systematic uncertainty in F(z,ptJet) from uncertainties in the jet energy scale and resolution, the track reconstruction efficiency and momentum resolution and the response matrix for 400 GeV < ptJet < 500 GeV. The total uncertainty from the combination is also shown.
png (71kB) eps (24kB) pdf (11kB)
Figure 02a
Systematic uncertainty in f(ptrel,ptJet) from uncertainties in the jet energy scale and resolution, the track reconstruction efficiency and momentum resolution and the response matrix for 25 GeV
png (56kB) eps (17kB) pdf (8kB)
Figure 02b
Systematic uncertainty in f(ptrel,ptJet) from uncertainties in the jet energy scale and resolution, the track reconstruction efficiency and momentum resolution and the response matrix for 400 GeV < ptJet < 500 GeV. The total uncertainty from the combination is also shown.
png (56kB) eps (16kB) pdf (8kB)
Figure 03a
Systematic uncertainty in rho_{ch}(r,ptJet) from uncertainties in the jet energy scale and resolution, the track reconstruction efficiency and momentum resolution and the response matrix for 25 GeV < ptJet < 40 GeV. The total uncertainty from the combination is also shown.
png (50kB) eps (15kB) pdf (8kB)
Figure 03b
Systematic uncertainty in rho_{ch}(r,ptJet) from uncertainties in the jet energy scale and resolution, the track reconstruction efficiency and momentum resolution and the response matrix for 400 GeV
png (51kB) eps (15kB) pdf (8kB)
Figure 04a
Distribution of F(z) for 25 GeV < ptJet < 40 GeV. The gray band indicates the total uncertainty.
png (108kB) eps (31kB) pdf (16kB)
Figure 04b
Distribution of F(z) for 400 GeV < ptJet < 500 GeV. The gray band indicates the total uncertainty.
png (120kB) eps (40kB) pdf (22kB)
Figure 05
Distributions of F(z) in bins of ptJet. The circles show unfolded data and the lines are the predictions from AMBT1 Pythia.
png (128kB) eps (33kB) pdf (19kB)
Figure 06a
The ratio of F(z) predicted by various Monte Carlo generators to that measured. The gray band indicates the combined statistical and systematic uncertainties.
png (155kB) eps (54kB) pdf (25kB)
Figure 06b
The ratio of F(z) predicted by various Monte Carlo generators to that measured. The gray band indicates the combined statistical and systematic uncertainties.
png (162kB) eps (55kB) pdf (29kB)
Figure 07a
Distribution of
png (101kB) eps (29kB) pdf (13kB)
Figure 07b
Distribution of the mean number of charged particles selected with the requirement ptTrack > 500 MeV as a function of ptJet for data and various Monte Carlos. The gray band indicated the total uncertainty.
png (100kB) eps (30kB) pdf (13kB)
Figure 08a
Distributions of rho_ch(r) for 25 GeV < ptJet < 40 GeV. The gray band indicates the total uncertainty.
png (94kB) eps (28kB) pdf (13kB)
Figure 08b
Distributions of rho_ch(r) for 400 GeV < ptJet < 500 GeV. The gray band indicates the total uncertainty.
png (93kB) eps (29kB) pdf (13kB)
Figure 09a
Distributions of f(ptrel) for 25 GeV < ptJet < 40 GeV. The gray band indicates the total uncertainty.
png (105kB) eps (32kB) pdf (15kB)
Figure 09b
Distributions of f(ptrel) for 400 GeV < ptJet < 500 GeV. The gray band indicates the total uncertainty.
png (111kB) eps (34kB) pdf (15kB)
Figure 10
Distributions of rho_ch(r). The circles show unfolded data. The lines are the predictions from AMBT1 Pythia.
png (125kB) eps (22kB) pdf (12kB)
Figure 11
Distributions of f(ptrel). The circles show unfolded data. The lines are the predictions from AMBT1 Pythia.
png (119kB) eps (23kB) pdf (13kB)
Figure 12a
The ratio of rho_ch(r) predicted by various Monte Carlo generators to that measured. The gray band indicates the combined statistical and systematic uncertainties.
png (131kB) eps (50kB) pdf (20kB)
Figure 12b
The ratio of rho_ch(r) predicted by various Monte Carlo generators to that measured. The gray band indicates the combined statistical and systematic uncertainties.
png (128kB) eps (50kB) pdf (20kB)
Figure 13a
The ratio of f(ptrel) predicted by various Monte Carlo generators to that measured. The gray band indicates the combined statistical and systematic uncertainties.
png (140kB) eps (51kB) pdf (22kB)
Figure 13b
The ratio of f(ptrel) predicted by various Monte Carlo generators to that measured. The gray band indicates the combined statistical and systematic uncertainties.
png (140kB) eps (51kB) pdf (22kB)
Figure 14
Comparison of the measured value of the average value of ptrel as a function of ptJet with various Monte Carlo expectations.
png (105kB) eps (29kB) pdf (13kB)
Auxiliary material
Figure 15a
Distribution of F(z) for 25 GeV < ptJet < 40 GeV. The gray band indicates the total uncertainty.
png (108kB) eps (31kB) pdf (16kB)
Figure 15b
Distribution of F(z) for 40 GeV < ptJet < 60 GeV. The gray band indicates the total uncertainty.
png (110kB) eps (33kB) pdf (17kB)
Figure 16a
Distribution of F(z) for 60 GeV < ptJet < 80 GeV. The gray band indicates the total uncertainty.
png (115kB) eps (36kB) pdf (18kB)
Figure 16b
Distribution of F(z) for 80 GeV < ptJet < 110 GeV. The gray band indicates the total uncertainty.
png (119kB) eps (40kB) pdf (21kB)
Figure 17a
Distribution of F(z) for 110 GeV < ptJet < 160 GeV. The gray band indicates the total uncertainty.
png (122kB) eps (39kB) pdf (21kB)
Figure 17b
Distribution of F(z) for 160 GeV < ptJet < 210 GeV. The gray band indicates the total uncertainty.
png (122kB) eps (40kB) pdf (21kB)
Figure 18a
Distribution of F(z) for 210 GeV < ptJet < 260 GeV. The gray band indicates the total uncertainty.
png (120kB) eps (40kB) pdf (21kB)
Figure 18b
Distribution of F(z) for 260 GeV < ptJet < 310 GeV. The gray band indicates the total uncertainty.
png (120kB) eps (39kB) pdf (21kB)
Figure 19a
Distribution of F(z) for 310 GeV < ptJet < 400 GeV. The gray band indicates the total uncertainty.
png (118kB) eps (39kB) pdf (21kB)
Figure 19b
Distribution of F(z) for 400 GeV < ptJet < 500 GeV. The gray band indicates the total uncertainty.
png (120kB) eps (40kB) pdf (22kB)
Figure 20a
Distributions of rho_ch(r) for 25 GeV < ptJet < 40 GeV. The gray band indicates the total uncertainty.
png (94kB) eps (28kB) pdf (13kB)
Figure 20b
Distributions of rho_ch(r) for 40 GeV < ptJet < 60 GeV. The gray band indicates the total uncertainty.
png (93kB) eps (29kB) pdf (13kB)
Figure 21a
Distributions of rho_ch(r) for 60 GeV < ptJet < 80 GeV. The gray band indicates the total uncertainty.
png (96kB) eps (32kB) pdf (15kB)
Figure 21b
Distributions of rho_ch(r) for 80 GeV < ptJet < 110 GeV. The gray band indicates the total uncertainty.
png (95kB) eps (32kB) pdf (15kB)
Figure 22a
Distributions of rho_ch(r) for 110 GeV < ptJet < 160 GeV. The gray band indicates the total uncertainty.
png (96kB) eps (30kB) pdf (14kB)
Figure 22b
Distributions of rho_ch(r) for 160 GeV < ptJet < 210 GeV. The gray band indicates the total uncertainty.
png (92kB) eps (29kB) pdf (14kB)
Figure 23a
Distributions of rho_ch(r) for 210 GeV < ptJet < 260 GeV. The gray band indicates the total uncertainty.
png (92kB) eps (29kB) pdf (13kB)
Figure 23b
Distributions of rho_ch(r) for 260 GeV < ptJet < 310 GeV. The gray band indicates the total uncertainty.
png (92kB) eps (29kB) pdf (13kB)
Figure 24a
Distributions of rho_ch(r) for 310 GeV < ptJet < 400 GeV. The gray band indicates the total uncertainty.
png (90kB) eps (29kB) pdf (13kB)
Figure 24b
Distributions of rho_ch(r) for 400 GeV < ptJet < 500 GeV. The gray band indicates the total uncertainty.
png (93kB) eps (29kB) pdf (13kB)
Figure 25a
Distributions of f(ptrel) for 25 GeV < ptJet < 40 GeV. The gray band indicates the total uncertainty.
png (105kB) eps (32kB) pdf (15kB)
Figure 25b
Distributions of f(ptrel) for 40 GeV < ptJet < 60 GeV. The gray band indicates the total uncertainty.
png (107kB) eps (33kB) pdf (15kB)
Figure 26a
Distributions of f(ptrel) for 60 GeV < ptJet < 80 GeV. The gray band indicates the total uncertainty.
png (110kB) eps (34kB) pdf (15kB)
Figure 26b
Distributions of f(ptrel) for 80 GeV < ptJet < 110 GeV. The gray band indicates the total uncertainty.
png (111kB) eps (36kB) pdf (16kB)
Figure 27a
Distributions of f(ptrel) for 110 GeV < ptJet < 160 GeV. The gray band indicates the total uncertainty.
png (112kB) eps (34kB) pdf (15kB)
Figure 27b
Distributions of f(ptrel) for 160 GeV < ptJet < 210 GeV. The gray band indicates the total uncertainty.
png (110kB) eps (33kB) pdf (15kB)
Figure 28a
Distributions of f(ptrel) for 210 GeV < ptJet < 260 GeV. The gray band indicates the total uncertainty.
png (109kB) eps (33kB) pdf (15kB)
Figure 28b
Distributions of f(ptrel) for 260 GeV < ptJet < 310 GeV. The gray band indicates the total uncertainty.
png (108kB) eps (33kB) pdf (15kB)
Figure 29a
Distributions of f(ptrel) for 310 GeV < ptJet < 400 GeV. The gray band indicates the total uncertainty.
png (109kB) eps (33kB) pdf (15kB)
Figure 29b
Distributions of f(ptrel) for 400 GeV < ptJet < 500 GeV. The gray band indicates the total uncertainty.
png (111kB) eps (34kB) pdf (15kB)