# LHCb plots for 2018 data

## X(3872) in pPb/Pbp:

Fit to the Jpsi pi pi invariant mass distributions to determine the yields of X(3872) in pPb/Pbp at 8.16 TeV. The invariant mass is reconstructed using the StrippingHeavyIonDiMuonJpsi2MuMu line from stripping 30r2 and 30r3 for Pbp and pPb, respectively. Jpsi candidates are selected from dimuons within \pm 3sigma of the Jpsi peak and combined with two opposite-sign pions that originate from the same vertex. Using the DecayTreeFitter, X(3872) candidates are reconstructed by refitting the four tracks with the constriants of a common vertex and constraining the dimuon mass to the known Jpsi mass. Candidates are required to have transverse momentum above 5 GeV/c.

Plot Description
The Jpsi pi pi invariant mass spectrum from pPb data recorded at 8.16 TeV. The solid black line shows the total fit, which is composed of a third order Chebychev polynomial representing the background (red dashed line) and a Gaussian representing the $\chi_{c1}$(3872) resonance (blue shaded area). The signal significance is 3.9$\sigma$.
The Jpsi pi pi invariant mass spectrum from Pbp data recorded at 8.16 TeV. The solid black line shows the total fit, which is composed of a third order Chebychev polynomial representing the background (red dashed line) and a Gaussian representing the $\chi_{c1}$(3872) resonance (blue shaded area). The signal significance is 2.6$\sigma$.

## LHCb-ANA-2019-040: PbPb UPC 2018 Jpsi/Psi2S ratio measurement:

Fit to the di-muon invariant mass distributions to determine the yields of Jpsi, Psi(2S) and non-reson backgrounds. The selection of the di-muon candidates include StrippingHeavyIonDiMuonJpsi2MuMuLine in Stripping35a, muon pT>700 MeV, muon 2.0<eta<4.5, dimuon system pT<1 GeV, delta-phi of the two muons greater than 0.9*pi, requiring nLongTracks=2, and a Herschel ln(chi2_hrc)<8.35 with a 90% signal efficiency.

Plot Description
Fit to the di-muon mass distribution to determine the fractions of $\jpsi$,$\psitwos$ and non-resonant events. The black dots are the data points, the blue line is the result of the fit described in the text. The green line is the $\jpsi$ contribution, the red line is the $\psitwos$ contribution, and the yellow fill is the non resonance background contribution.
Fit to the di-muon mass to determine the fractions of $\jpsi$,$\psitwos$ and non-resonant events for rapidity bin $2.0<y < 2.5$.
Fit to the di-muon mass to determine the fractions of $\jpsi$,$\psitwos$ and non-resonant events for rapidity bin $2.5<y < 3.0$.
Fit to the di-muon mass to determine the fractions of $\jpsi$,$\psitwos$ and non-resonant events for rapidity bin $3.0<y < 3.5$.
Fit to the di-muon mass to determine the fractions of $\jpsi$,$\psitwos$ and non-resonant events for rapidity bin $3.5<y < 4.0$.
Fit to the di-muon mass to determine the fractions of $\jpsi$,$\psitwos$ and non-resonant events for rapidity bin $4.0<y < 4.5$.

## LHCb-ANA-2019-0xx: Charm production in PbPb at √sNN = 5 TeV and pPb at √sNN = 8 TeV

Invariant mass distribution of $\mu^+\mu^-$ in the full 2018 PbPb datasets. Data are reconstructed up to 10000 nVeloClusters which correspond to a lower bound of $\sim 60\%$ in centrality. The following selection is used: JpsiToMuMu stripping line (S35) with the standard selection based on J/$\psi$ analysis note (see LHCb-ANA-2016-067) and a luminous region cut as well to reduce SMOG contamination (see details in the next description's plot). There are around 1800 J/$\psi$ signal candidates.

Plot Description
PbPb Plots
Invariant mass distribution of $\K^{\mp} \pi^{\pm}$ in the full 2018 PbPb datasets. Data are reconstructed up to 10000 nVeloClusters which correspond to a lower bound of $\sim 60\%$ in centrality. The following $D^0$ selection is applied: HeavyIonOpenCharmD02kpiLine stripping line (S35), and $D^0$ standard selection in pPb (see CERN-LHCb-ANA-2016-012) is applied, together with a cut on the luminous region in order to reduce SMOG contamination : $\abs{ z_{PV} }$ < 200 mm, 0.35 < $\rho$ <1.1 mm with $\rho =︎\sqrt{x_{PV}^2 + y_{PV}^2), based on the J/$\psi$analysis note in 2015 PbPb collisions (see LHCb-ANA-2016-067). There are around 83000$D^0$signal candidates Invariant mass distribution of$\K^{\pm} \pi^{\mp} \pi^{\mp}$in the full 2018 PbPb datasets. Data are reconstructed up to 10000 nVeloClusters which correspond to a lower bound of$\sim 60\%$in centrality. The following$D^+$selection is applied: HeavyIonOpenCharmDp2KHHLine stripping line (S35), and$D^0$standard selection in pPb (see CERN-LHCb-ANA-2016-012) is applied, together with a cut on the luminous region in order to reduce SMOG contamination :$ \abs{ z_{PV} }$< 200 mm, 0.35 <$\rho$<1.1 mm with$\rho =︎\sqrt{x_{PV}^2 + y_{PV}^2), based on the J/$\psi$ analysis note in 2015 PbPb collisions (see LHCb-ANA-2016-067). There are around 8900 $D^+$ signal candidates
Invariant mass distribution of $\K^{\pm} \K^{\mp} \pi^{\mp}$ in the full 2018 PbPb datasets. Data are reconstructed up to 10000 nVeloClusters which correspond to a lower bound of $\sim 60\%$ in centrality. The following $D_s^+$ selection is applied: HeavyIonOpenCharmDs2KKHLine stripping line (S35), and $D^0$ standard selection in pPb (see CERN-LHCb-ANA-2016-012) is applied, together with a cut on the luminous region in order to reduce SMOG contamination : $\abs{ z_{PV} }$ < 200 mm, 0.35 < $\rho$ <1.1 mm with $\rho =︎\sqrt{x_{PV}^2 + y_{PV}^2), based on the J/$\psi$analysis note in 2015 PbPb collisions (see LHCb-ANA-2016-067). There are around 1700$D_s^+$signal candidates Invariant mass distribution of$\K^p \pi^- p$(and charge-conjugate) in the full 2018 PbPb datasets. Data are reconstructed up to 10000 nVeloClusters which correspond to a lower bound of$\sim 60\%$in centrality. The following$\Lamdba_c$selection is applied: HeavyIonOpenCharmLc2PKpiLine stripping line (S35), and$D^0$standard selection in pPb (see CERN-LHCb-ANA-2016-012) is applied, together with a cut on the luminous region in order to reduce SMOG contamination :$ \abs{ z_{PV} }$< 200 mm, 0.35 <$\rho$<1.1 mm with$\rho =︎\sqrt{x_{PV}^2 + y_{PV}^2), based on the J/$\psi$ analysis note in 2015 PbPb collisions (see LHCb-ANA-2016-067). There are around 600 $\Lamdba_c$ signal candidates
pPb Plots
Distribution of the mass difference $\Delta M \equiv M(\mumu\g) - M(\mumu)$ for converted photons reconstructed from downstream track electrons in 2016 $p$Pb collisions at forward rapidity (integrated luminosity $\mathcal{L} = 13.6 \pm 0.3 \ \mub^{-1}$), integrated in $\pt$ and over $1.5 < y* < 4.0$. The distribution is fitted with a combination of Gaussian functions for the signal peaks and a 3rd degree Chebyshev polynomial for background. The following $\chicJ$ selection was applied: HeavyIonDiMuonJpsi2MuMuLine stripping line (S30r3), mass of the electron-positron pair $M_{ee} < 200 \text{ MeV}/c^{2}$, transverse momentum of the electron-positron pair $\pt^{ee} > 50 \text{ MeV}/c$; $\chicJ$, $\jpsi$, and $\mupm$ required to be within $2.0 < \eta < 4.0$; $\epm$ and $\g$ within $2.0 < \eta < 5.0$. The shown distribution also satisfies $\pt^{\g} > 600 \text{ MeV}/c$ and $3054 < M_{\jpsi} < 3138 \text{ MeV}/c^{2}$. Only events with at least one primary vertex were considered.
Distribution of the mass difference $\Delta M \equiv M(\mumu\g) - M(\mumu)$ for calorimetric photons in 2016 $p$Pb collisions at forward rapidity (integrated luminosity $\mathcal{L} = 13.6 \pm 0.3 \ \mub^{-1}$). The distribution is integrated over $1.5 < y* < 4.0$ and for $\pt^{\jpsi} > 3 \text{ GeV}/c$. The distribution is fitted with a combination of Gaussian functions describing the signal and a Mass-Difference Background Distribution. The following $\chicJ$ selection was applied: HeavyIonDiMuonJpsi2MuMuLine stripping line (S30r3), ECAL selection $E_{\rm HCAL}/E_{\rm ECAL}<0.3$, CL$>0.5$, and measured transverse momentum of the photon $\pt^{\g} > 300 \text{ MeV}/c$; $\chicJ$, $\jpsi$, and $\mupm$ required to be within $2.0 < \eta < 4.0$; $\g$ within $2.0 < \eta < 5.0$. The shown distribution also satisfies $\pt^{\g} > 600 \text{ MeV}/c$, $3054 < M_{\jpsi} < 3138 \text{ MeV}/c^{2}$, and $\pt^{\jpsi} > 3 \text{ GeV}/c$. Only events with at least one primary vertex were considered.

## Performance plots in PbPb upgrade simulations:

Plot Description
The Jpsi pi pi invariant mass spectrum from pPb data recorded at 8.16 TeV. The solid black line shows the total fit, which is composed of a third order Chebychev polynomial representing the background (red dashed line) and a Gaussian representing the $\chi_{c1}$(3872) resonance (blue shaded area).
The Jpsi pi pi invariant mass spectrum from Pbp data recorded at 8.16 TeV. The solid black line shows the total fit, which is composed of a third order Chebychev polynomial representing the background (red dashed line) and a Gaussian representing the $\chi_{c1}$(3872) resonance (blue shaded area).

-- BenjaminAudurier - 2019-10-14

Topic attachments
I Attachment History Action Size Date Who Comment
pdf LHCb_PbPbUPC2018_plots.pdf r1 manage 297.1 K 2019-10-28 - 17:27 HengneLiUVa
png PbPb_run3_SciFi.001.png r1 manage 136.3 K 2019-10-31 - 08:37 BenjaminAudurier
png PbPb_run3_velo.001.png r1 manage 133.6 K 2019-10-31 - 08:37 BenjaminAudurier
pdf Pbp_DD_Gauss_ChebPol3_100_900.pdf r1 manage 17.8 K 2019-10-14 - 15:31 JanaCrkovska
png Pbp_DD_Gauss_ChebPol3_100_900.png r1 manage 63.3 K 2019-10-14 - 15:31 JanaCrkovska
pdf Pbp_NC_Gauss_D0BG_250_700.pdf r1 manage 18.4 K 2019-10-14 - 15:33 JanaCrkovska
png Pbp_NC_Gauss_D0BG_250_700.png r1 manage 61.7 K 2019-10-14 - 15:33 JanaCrkovska
pdf Pbp_fit.pdf r1 manage 18.4 K 2019-10-28 - 19:41 JohnMatthewDurham
png Pbp_fit.png r1 manage 107.4 K 2019-10-28 - 19:45 JohnMatthewDurham
pdf Performance_PbPb_pPb_v1.pdf r1 manage 694.9 K 2019-10-15 - 09:50 BenjaminAudurier
pdf mass_fit.pdf r1 manage 25.1 K 2019-10-28 - 17:16 HengneLiUVa
png mass_fit.png r1 manage 65.4 K 2019-10-28 - 17:27 HengneLiUVa
pdf mass_fit_1.pdf r1 manage 26.0 K 2019-10-28 - 17:16 HengneLiUVa
png mass_fit_1.png r1 manage 61.5 K 2019-10-28 - 17:27 HengneLiUVa
pdf mass_fit_2.pdf r1 manage 25.8 K 2019-10-28 - 17:16 HengneLiUVa
png mass_fit_2.png r1 manage 69.8 K 2019-10-28 - 17:27 HengneLiUVa
pdf mass_fit_3.pdf r1 manage 25.9 K 2019-10-28 - 17:16 HengneLiUVa
png mass_fit_3.png r1 manage 70.3 K 2019-10-28 - 17:27 HengneLiUVa
pdf mass_fit_4.pdf r1 manage 26.1 K 2019-10-28 - 17:16 HengneLiUVa
png mass_fit_4.png r1 manage 63.1 K 2019-10-28 - 17:27 HengneLiUVa
pdf mass_fit_5.pdf r1 manage 25.8 K 2019-10-28 - 17:16 HengneLiUVa
png mass_fit_5.png r1 manage 50.7 K 2019-10-28 - 17:27 HengneLiUVa
pdf pPb_fit.pdf r1 manage 18.4 K 2019-10-28 - 19:41 JohnMatthewDurham
png pPb_fit.png r1 manage 106.8 K 2019-10-28 - 19:45 JohnMatthewDurham
pdf D0_PbPb_integrated.pdf r2 r1 manage 18.7 K 2019-10-26 - 16:28 BenjaminAudurier
png D0_PbPb_integrated.png r2 r1 manage 102.3 K 2019-10-26 - 16:28 BenjaminAudurier
pdf Dplus_PbPb_integrated.pdf r2 r1 manage 17.2 K 2019-10-26 - 16:28 BenjaminAudurier
png Dplus_PbPb_integrated.png r2 r1 manage 93.9 K 2019-10-26 - 16:28 BenjaminAudurier
pdf Ds_PbPb_integrated.pdf r2 r1 manage 23.0 K 2019-10-26 - 16:28 BenjaminAudurier
png Ds_PbPb_integrated.png r2 r1 manage 92.5 K 2019-10-26 - 16:28 BenjaminAudurier
pdf Lc_PbPb_integrated.pdf r2 r1 manage 19.7 K 2019-10-26 - 16:28 BenjaminAudurier
png Lc_PbPb_integrated.png r2 r1 manage 91.9 K 2019-10-26 - 16:28 BenjaminAudurier
pdf PbPb_run3_velo.pdf r2 r1 manage 217.9 K 2019-10-31 - 08:37 BenjaminAudurier
pdf pPb_DD_Gauss_ChebPol3_100_900.pdf r2 r1 manage 17.9 K 2019-10-21 - 21:39 JanaCrkovska
png pPb_DD_Gauss_ChebPol3_100_900.png r2 r1 manage 73.6 K 2019-10-21 - 21:38 JanaCrkovska
pdf pPb_NC_Gauss_D0BG_250_700.pdf r2 r1 manage 18.3 K 2019-10-21 - 21:39 JanaCrkovska
png pPb_NC_Gauss_D0BG_250_700.png r2 r1 manage 67.4 K 2019-10-21 - 21:37 JanaCrkovska
pdf PbPb_run3_SciFi.pdf r3 r2 r1 manage 256.9 K 2019-10-31 - 08:37 BenjaminAudurier

This topic: LHCb > LHCbPhysics > IonsFixedTarget > LHCbPlotsQM2019
Topic revision: r11 - 2019-10-31 - BenjaminAudurier

Copyright &© 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback