LHCb plots for 2015 data
Dimuon plots
The approved dimuon (23/5) plot is superseded by those of
CONF 2016-005
.
See also
LHCbPublicityPlotsCONF.
Pb-Pb plots (approved 23 May 2016)
General plots to define event activity classes
Plot |
Description |
|
Ecal energy distribution in Pb-Pb collisions divided into event-activity classes. The highest event activity class is the 0-10%. This class corresponds also to most central collisions. |
|
Distribution of the number of clusters in the VELO in Pb-Pb collisions. The distribution is also divided into event activity classes of Ecal energy. The highest event-activity class corresponds to events with the highest number of VeloClusters. |
|
Correlation between the energy in the Ecal and the number of VeloClusters in Pb-Pb collisions. |
J/ψ in event activity classes
Plot |
Description |
|
Invariant mass distribution of J/ψ candidates in the event-activity class 70-90% |
|
Invariant mass distribution of J/ψ candidates in the event-activity class 50-70% |
D0 in event activity classes
Plot |
Description |
|
Invariant mass distribution of D0 candidates in the event-activity class 70-90% |
|
Invariant mass distribution of D0 candidates in the event-activity class 50-70% |
K0s in event activity classes
Plot |
Description |
|
Invariant mass distribution of K0s candidates in the event-activity class 70-90% |
|
Invariant mass distribution of K0s candidates in the event-activity class 50-70% |
Λ in event activity classes
Plot |
Description |
|
Invariant mass distribution of Λ candidates in the event-activity class 70-90% |
|
Invariant mass distribution of Λ candidates in the event-activity class 50-70% |
J/ψ in ultraperipheral Pb-Pb collisions
Plot |
Description |
|
Invariant mass distribution of J/ψ candidates in events containing only two long tracks and only two VeloTracks. No Downstream tracks, no Upstream tracks and no TT tracks are present. Number of hits in the SPD is also less than 20. |
|
pT2 distribution of the dimuon candidates, in the invariant mass range 3050 < M < 3150 MeV/c2, in events containing only two long tracks and only two VeloTracks. No Downstream tracks, no Upstream tracks and no TT tracks are present. Number of hits in the SPD is also less than 20. |
Event display
|
Pb-Pb event display with large number of reconstructed tracks (1130) and with a J/ψ candidate |
* Link to the internal note on cds:
LHCb-INT-2016-025
SMOG plots, pNe collisions (approved 23 May 2016)
J/ψ
D0
* Link to the internal note on cds:
LHCb-INT-2016-025
Questions received during talks regarding the publicity plots
Question about track reconstruction in Pb-Pb: are the limitations hardware or software?
We are using so far the standard pp reconstruction and tracking, i.e. our software is not yet optimised for extremely high occupancies. We plan to have in the future dedicated tracking algorithms
and reconstruction optimised for high occupancy events as
PbPb and pPb/SMOG.
--
SilviaBorghi - 2016-05-23