Difference: PIDConferencePlots (14 vs. 15)

Revision 152019-03-28 - SophieKatherineBaker

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META TOPICPARENT name="LHCbPPTS"

PID Plots for Conference

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MC15TuneV1_ProbNNd_0.0_to_1000000.0_LcpKpi.png

ProbNNd shapes for charged tracks from MC.

Deuterons are taken from a 2016 $\Lambda_{b} \rightarrow dp$ sample, and other tracks are from a 2016 $\Lambda_{c} \rightarrow pK\pi$ sample, for all momenta. Decay products in the $\Lambda_{c}$ sample are removed, such that the sample is a close representation of a MinBias sample.

Yields of each track type is normalised to unity.

MC15TuneV1_ProbNNd_0.0_to_1000000.0_LcpKpi_vs_P.png

Profile histogram of ProbNNd in bins of momentum for MC tracks in range 0 < p < 100 GeV.c. MC samples are the same as above. Features in the shapes can be attributed to the RICH thresholds, where separation between the particles changes.

9.3 GeV/c is RICH 1 kaon threshold

15.3 GeV/c is RICH 2 kaon threshold

17.7 GeV/c is RICH 1 proton threshold

29.7 GeV/c is RICH 2 proton threshold

35.4 GeV/c is RICH 1 deuteron threshold

59.3 GeV/c is RICH 2 deuteron threshold

Changed:
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FitToProbNNd_toy_25_29700_35400.png

A template fit to a toy histogram in ProbNNd, with shapes for each component taken from MC (deuterons from 2016 $\Lambda_{b} \rightarrow dp$ sample, all others from 2016 $\Lambda_{c} \rightarrow pK\pi$), and the toy a combination of the MC shapes.

This is for the momentum region 29.7 < p < 35.4 GeV/c, with the relative yields of each of the track types taken from generator-level MC of prompt deuteron production.

Integrated number of entries in the plot approximately matches the number of tracks in the NoBias 2017 data sample for this momentum bin.

Note the variable width bins on the x-axis, which are plotted evenly; the binning was chosen such that the deuteron shape would be flat, so the plot is concentrated in the very high ProbNNd region.

>
>
FitToProbNNd_toy_25_29700_35400.png

A template fit to a toy histogram in ProbNNd, with shapes for each component taken from MC (deuterons from 2016 $\Lambda_{b} \rightarrow dp$ sample, all others from 2016 $\Lambda_{c} \rightarrow pK\pi$), and the toy a combination of the MC shapes.

This is for the momentum region 29.7 < p < 35.4 GeV/c, with the relative yields of each of the track types taken from generator-level MC of prompt deuteron production.

Integrated number of entries in the plot approximately matches the number of tracks in the NoBias 2017 data sample for this momentum bin.

Note the variable width bins in ProbNNd on the x-axis, which are plotted evenly and labelled as the deuteron fraction; the binning was chosen such that the deuteron shape would be flat, so the plot is concentrated in the very high ProbNNd region.

 
approved_LHCb_Ratios_BothModels_fromHistograms.png

The expected deuteron yield as a ratio of pion yield, in bins of momentum, using two deuteron production models: coalesence and cross-section.

The $p$ and ${K}$ yields are also shown as ratios of $\pi$ yield.

These yields were taken from generator-level MC. Gauss is used to generate the $pp$–collisions, with a function appended to it to form deuterons from $p$ and $n$ pairs in each event.

Approved on 18/09/2018: https://indico.cern.ch/event/757547/contributions/3144861/attachments/1717660/2771699/Plot_approval.pdf

approved_DLLd_PionDeut.png

Plot to demonstrate the separation offered by DLL variables.

Normalised pion and deuteron distributions in DLL$(d - \pi)$ from $\Lambda_{b}^{0} \rightarrow d \bar{p}$ MC sample, with requirement that tracks satisfy hasRICH.

Approved on 18/09/2018: https://indico.cern.ch/event/757547/contributions/3144861/attachments/1717660/2771699/Plot_approval.pdf

approved_AllParticles_Efficiency_DLLd_5_HasRICH.png

In bins of momentum, deuteron-selection efficiencies for deuterons, and mis-ID efficiencies for $p, K $ and $\pi$.

For deuterons, the efficiencies are taken from a MC sample ($\Lambda_{b}^{0} \rightarrow d \bar{p}$),and for $p, K $ and $\pi$ they are taken from PIDCalib. DLL$(d - \pi)$ > 5 && DLL$(d - K)$ > 5 && DLL$(d - p)$ > 5 && hasRICH

Approved on 18/09/2018: https://indico.cern.ch/event/757547/contributions/3144861/attachments/1717660/2771699/Plot_approval.pdf

 
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