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Azimuthal distributions for tracks with \pTmin\ = 500~MeV and $|\eta| < 2.5$ in data at $\sqrt{s}=7$~TeV. (a) Uncorrected distribution of $\Delta\phi$; (b) distributions for the same hemisphere in $\eta$ as the leading track, and for the opposite hemisphere. The statistical uncertainties are smaller than the plotted symbol.

noimg: Multiplicity correlations for events at $\sqrt{s} = 7$~TeV for events with a minimum of two charged particles in the kinematic interval $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$ for different combinations of forward and backward pseudorapidity interval. The quoted uncertainties are the systematic uncertainties; the statistical uncertainties are approximately $\pm0.001$ or less and are small by comparison.: Forward-backward multiplicity correlation for charged particles in symmetrically opposite $\eta$-intervals for events with a minimum of two charged particles in the kinematic interval $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$ at $\sqrt{s}=$900~GeV and 7~TeV. The final column shows the global result. The quoted uncertainties are first statistical, second systematic; where the statistical uncertainty is less than approximately $\pm0.001$, only the systematic uncertainty is shown.: Forward-backward charged-particle multiplicity correlations at $\sqrt{s} = 7$~TeV, in symmetrically opposite $\eta$-intervals, for events with at least two charged particles with $|\eta| < 2.5$ and $p_T > p_{\rm {T min}}$, for varying values of $p_{\rm {T min}}$. The final column shows the global result. The quoted uncertainties are first statistical, second systematic; where the statistical uncertainty is less than approximately $\pm0.001$, only the systematic uncertainty is shown.: Forward-backward summed \pT\ correlation for charged particles in symmetrically opposite $\eta$ intervals, for events with at least two charged particles in the kinematic interval $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$ at $\sqrt{s}=$900~GeV and 7~TeV, for corrected data. The quoted uncertainties are first statistical, second systematic; where the statistical uncertainty less than approximately $\pm0.001$, only the systematic uncertainty is shown.

Azimuthal distributions for tracks with \pTmin\ = 500~MeV and $|\eta| < 2.5$ in data at $\sqrt{s}=7$~TeV. (a) Uncorrected distribution of $\Delta\phi$; (b) distributions for the same hemisphere in $\eta$ as the leading track, and for the opposite hemisphere. The statistical uncertainties are smaller than the plotted symbol.

Azimuthal distributions for tracks with \pTmin\ = 500~MeV and $|\eta| < 2.5$ in data at $\sqrt{s}=7$~TeV. (a) Uncorrected distribution of $\Delta\phi$; (b) distributions for the same hemisphere in $\eta$ as the leading track, and for the opposite hemisphere. The statistical uncertainties are smaller than the plotted symbol.

Azimuthal distributions for tracks with \pTmin\ = 500~MeV and $|\eta| < 2.5$ in data at $\sqrt{s}=7$~TeV. (a) Uncorrected distribution of $\Delta\phi$; (b) distributions for the same hemisphere in $\eta$ as the leading track, and for the opposite hemisphere. The statistical uncertainties are smaller than the plotted symbol.

Multiplicity correlation at 7~TeV in a matrix of forward/backward $\eta$-intervals for $|\eta| < 2.5,$ for events with at least two charged particles with $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$. (a)~data; (b)~\PYTHIA~6 MC09 tune. The statistical uncertainties are of the order of $\pm0.001$.

Multiplicity correlation at 7~TeV in a matrix of forward/backward $\eta$-intervals for $|\eta| < 2.5,$ for events with at least two charged particles with $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$. (a)~data; (b)~\PYTHIA~6 MC09 tune. The statistical uncertainties are of the order of $\pm0.001$.

Multiplicity correlation at 7~TeV in a matrix of forward/backward $\eta$-intervals for $|\eta| < 2.5,$ for events with at least two charged particles with $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$. (a)~data; (b)~\PYTHIA~6 MC09 tune. The statistical uncertainties are of the order of $\pm0.001$.

Multiplicity correlation at 7~TeV in a matrix of forward/backward $\eta$-intervals for $|\eta| < 2.5,$ for events with at least two charged particles with $p_{\rm T} > 100$~MeV and $|\eta| < 2.5$. (a)~data; (b)~\PYTHIA~6 MC09 tune. The statistical uncertainties are of the order of $\pm0.001$.

Forward-backward multiplicity correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared with a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward multiplicity correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared to a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward multiplicity correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared with a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward multiplicity correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared to a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward multiplicity correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared to a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward multiplicity correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared with a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward multiplicity correlations: (a)~as a function of $\eta$ for different values of $p_{\rm{ T min}}$; (b)~as a function of $p_{\rm {T min}}$ for different values of $\eta$, with lines drawn to guide the eye. The plotted systematic uncertainties are smaller than the symbol in many cases; the statistical uncertainties are too small to be visible on the figure.

Forward-backward multiplicity correlations: (a)~as a function of $\eta$ for different values of $p_{\rm{ T min}}$; (b)~as a function of $p_{\rm {T min}}$ for different values of $\eta$, with lines drawn to guide the eye. The plotted systematic uncertainties are smaller than the symbol in many cases; the statistical uncertainties are too small to be visible on the figure.

Forward-backward multiplicity correlations: (a)~as a function of $\eta$ for different values of $p_{\rm{ T min}}$; (b)~as a function of $p_{\rm {T min}}$ for different values of $\eta$, with lines drawn to guide the eye. The plotted systematic uncertainties are smaller than the symbol in many cases; the statistical uncertainties are too small to be visible on the figure.

Forward-backward multiplicity correlations: (a)~as a function of $\eta$ for different values of $p_{\rm{ T min}}$; (b)~as a function of $p_{\rm {T min}}$ for different values of $\eta$, with lines drawn to guide the eye. The plotted systematic uncertainties are smaller than the symbol in many cases; the statistical uncertainties are too small to be visible on the figure.

Forward-backward $\Sigma$\pT\ correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared to a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward $\Sigma$\pT\ correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared with a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward $\Sigma$\pT\ correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared to a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward $\Sigma$\pT\ correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared with a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward $\Sigma$\pT\ correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared to a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Forward-backward $\Sigma$\pT\ correlation in symmetrically opposite $\eta$ intervals for events with at least two charged particles with $p_{\rm{T}} \geq $ 100~MeV and $|\eta| < 2.5$. (a)~Data at 7~TeV, compared with a selection of MC simulations. The systematic uncertainties are indicated by a grey band; the statistical uncertainties are too small to be visible on the figure. (b)~The same at 900~GeV. (c)~Ratio of the 900~GeV results to the 7~TeV results.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Subtracted and normalised $\Delta\phi$ distributions ($N^T_{sub}$) for data taken at $\sqrt{s} = 900$~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| < 1.0,$ $|\eta| < 2.0,$ $|\eta| < 2.5.$ The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared to the predictions of the different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.

Normalised ``same hemisphere minus opposite'' distributions ($N^T_{SO}$) for data taken at $\sqrt{s} = 900 $~GeV (a, c, e) and 7 TeV (b, d, f). Three different pseudorapidity regions are shown: $|\eta| <$ 1.0, $|\eta| <$ 2.0, $|\eta| <$ 2.5. The data (black symbols) are compared with the predictions of different MC tunes (see text for more details). The vertical bars on the data points denote the statistical uncertainty, while the shaded areas denote the total uncertainty. The leading particle in each event is omitted from the plot.