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Measurement of the forward energy flow in $pp$ collisions at $\sqrt{s}$= 7 TeV

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Abstract

The energy flow created in pp collisions at sqrt(s)=7 TeV is studied within the pseudorapidity range 1.9<eta<4.9 with data collected by the LHCb experiment. The measurements are performed for inclusive minimum-bias interactions, hard scattering processes and events with an enhanced or suppressed diffractive contribution. The results are compared to predictions given by PYTHIA-based and cosmic-ray event generators, which provide different models of soft hadronic interactions.

Figures and captions

Charged energy flow as a function of $\eta$ for all event classes as indicated in the figures. The corrected measurements are given by points with error bars, while the predictions by the {\sc Pythia} tunes are shown as histograms. The error bars represent the systematic uncertainties, which are highly correlated between the bins. The statistical uncertainties are negligible. The ratios of MC predictions to data are shown in addition.

Inclus[..].pdf [16 KiB]
HiDef png [560 KiB]
Thumbnail [126 KiB]
*.C file
InclusiveChargedEF_pythia.pdf
HardQC[..].pdf [16 KiB]
HiDef png [559 KiB]
Thumbnail [127 KiB] *.C file
HardQCDChargedEF_pythia.pdf
DiffrC[..].pdf [16 KiB]
HiDef png [502 KiB]
Thumbnail [124 KiB] *.C file
DiffrChargedEF_pythia.pdf
NonDif[..].pdf [16 KiB]
HiDef png [570 KiB]
Thumbnail [128 KiB] *.C file
NonDiffrChargedEF_pythia.pdf

Charged energy flow as a function of $\eta$ for all event classes as indicated in the figures. The corrected measurements are given by points with error bars, while the predictions by the cosmic-ray interaction models are shown as histograms. The error bars represent the systematic uncertainties, which are highly correlated between the bins. The statistical uncertainties are negligible. The ratios of MC predictions to data are shown in addition.

Inclus[..].pdf [16 KiB]
HiDef png [543 KiB]
Thumbnail [124 KiB]
*.C file
InclusiveChargedEF_cosmic.pdf
HardQC[..].pdf [16 KiB]
HiDef png [545 KiB]
Thumbnail [123 KiB] *.C file
HardQCDChargedEF_cosmic.pdf
DiffrC[..].pdf [16 KiB]
HiDef png [521 KiB]
Thumbnail [120 KiB] *.C file
DiffrChargedEF_cosmic.pdf
NonDif[..].pdf [16 KiB]
HiDef png [552 KiB]
Thumbnail [126 KiB] *.C file
NonDiffrChargedEF_cosmic.pdf

Total energy flow as a function of $\eta$ for all event classes as indicated in the figures. The corrected measurements are given by points with error bars, while the predictions by the {\sc Pythia} tunes are shown as histograms. The data obtained with extrapolated $k_{\eta}$ factors are shown in grey. The error bars represent the systematic uncertainties, which are highly correlated between the bins. The statistical uncertainties are negligible. The ratios of MC predictions to data are shown in addition.

Inclus[..].pdf [16 KiB]
HiDef png [542 KiB]
Thumbnail [123 KiB]
*.C file
InclusiveTotalEF_pythia.pdf
HardQC[..].pdf [16 KiB]
HiDef png [589 KiB]
Thumbnail [135 KiB] *.C file
HardQCDTotalEF_pythia.pdf
DiffrT[..].pdf [16 KiB]
HiDef png [480 KiB]
Thumbnail [117 KiB] *.C file
DiffrTotalEF_pythia.pdf
NonDif[..].pdf [16 KiB]
HiDef png [551 KiB]
Thumbnail [124 KiB] *.C file
NonDiffrTotalEF_pythia.pdf

Total energy flow as a function of $\eta$ for all event classes as indicated in the figures. The corrected measurements are given by points with error bars, while the predictions by the cosmic-ray interaction models are shown as histograms. The data obtained with extrapolated $k_{\eta}$ factors are shown in grey. The error bars represent the systematic uncertainties, which are highly correlated between the bins. The statistical uncertainties are negligible. The ratios of MC predictions to data are shown in addition.

Inclus[..].pdf [16 KiB]
HiDef png [514 KiB]
Thumbnail [120 KiB]
*.C file
InclusiveTotalEF_cosmic.pdf
HardQC[..].pdf [16 KiB]
HiDef png [522 KiB]
Thumbnail [118 KiB] *.C file
HardQCDTotalEF_cosmic.pdf
DiffrT[..].pdf [16 KiB]
HiDef png [502 KiB]
Thumbnail [115 KiB] *.C file
DiffrTotalEF_cosmic.pdf
NonDif[..].pdf [16 KiB]
HiDef png [520 KiB]
Thumbnail [121 KiB] *.C file
NonDiffrTotalEF_cosmic.pdf

Animated gif made out of all figures.

PAPER-2012-034.gif
Thumbnail
thumbnail_PAPER-2012-034.gif

Tables and captions

Relative systematic uncertainties (in percent) affecting the energy flow measurements for all event classes. The total uncertainties are obtained by adding the individual sources in quadrature. The ranges indicate the variation of the uncertainty as a function of $\eta$.

Table_1.pdf [52 KiB]
HiDef png [115 KiB]
Thumbnail [20 KiB]
tex code
Table_1.pdf

Charged energy flow for all event classes and $\eta$ bins with the corresponding systematic uncertainties. The statistical uncertainties are insignificant and not listed. All values are in GeV per unit pseudorapidity interval.

Table_2.pdf [32 KiB]
HiDef png [96 KiB]
Thumbnail [15 KiB]
tex code
Table_2.pdf

Total energy flow for all event classes and $\eta$ bins with the corresponding systematic uncertainties. The statistical uncertainties are insignificant and not listed. All values are in GeV per unit pseudorapidity interval.

Table_3.pdf [32 KiB]
HiDef png [102 KiB]
Thumbnail [16 KiB]
tex code
Table_3.pdf

Created on 17 December 2018.Citation count from INSPIRE on 18 December 2018.