Difference: PublicSts (1 vs. 11)

Revision 11
21 Jan 2019 - Main.JohannMHeuser
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META TOPICPARENT name="WebHome"
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Silicon Tracking System and Micro-Vertex Detector


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Silicon Tracking System

 
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Table of Contents
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The Silicon Tracking System (STS) is the main detector in the CBM experiment for charged particle measurement including momentum determination.
 
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Overview of the detector system

The Silicon Tracking System (STS) is the central component of the CBM experiment. It serves for track and momentum measurement of all charged particles produced at the target. Between the target and the STS, a Micro-Vertex Detector (MVD) enables to distinguish particle decay vertices from the event vertex. A benchmark observable is the D meson (“open charm”), a rare probe that has to be identified via its hadronic decays $ D^0 \rightarrow K^-\pi^+ $ and $ D^\pm \rightarrow K^\mp\pi^\pm\pi^\pm $. This challenging task requires a detector with high position resolution, very low material budget, high radiation tolerance and a fast self-triggered readout.
>
>
For a more detailed overview, see https://fair-center.eu/for-users/experiments/nuclear-matter-physics/cbm/projects/sts.html.
 
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The current STS-MVD layout consists of 8 stations that are placed inside a magnetic dipole field which provides the bending power required for momentum determination with an accuracy of about Δp/p = 1%.

The STS comprises 8 detector stations:
  • Stations are placed in 30, 35, 40, 50, 60, 75, 95, 100 cm distance from the target fully based on low-mass Silicon micro-strip detectors for the track point measurement. The stations have ladder structure and are build of 300 μm thick double-sided silicon micro strip sensors. To achieve low-mass detector with 60 μm strip pitch read-out electronics is placed at the perimeter of the STS. Signals from sectors are sent through thin capton micro-cables to the front-end boards.

The MVD comprises two detector stations:
  • They are located at 5 and 10 cm (alternatively 10 and 20 cm) downstream of the target and will be installed in a vacuum vessel. We plan to use very thin pixel detectors with very high spatial resulution there. Monolithic Active Pixel Sensors (MAPS) with a pixel size of 40x40 μm2, yielding a spatial resolution of 3 μm, and a thickness of 100 μm would perfectly fulfill our requirements concerning vertex resolution which is needed to measure the displaced vertices of D mesons. The R&D on MAPS concentrates on the improvement of radiation hardness and readout speed.

Simulations are being performed to optimize the number of STS and MVD stations, their layout and the material budget of the detectors, for efficient track finding, high-resolution momentum measurement and vertex selection. The simulations are closely linked to the detector R&D activities.


STS/MVD challenge

Au+Au collisions, 25 GeV/nucleon:
  • high track densities:
    600 charged particles in polar acceptance 2.5 - 25 deg
  • high r/o speed, radiation hardness:
    10 MHz interaction rate (109 ions/s on 1% λint target), only high-level triggers.



(Left) Simulation of a central Au+Au collision at 25 GeV/nucleon in the STS.
(Right) Illustration of rare "open charm" decays to be identified as detached vertices in about 100 μm distance from the event vertex.


STS/MVD detector layout

The standard STS/MVD detector in the CBM detector simulation.

test
(Left) Schematical cross section of the detector concept. The target is on the left hand side. The first two (or three) stations from the target are the Micro Vertex Detector (MVD). They will be built from thin MAPS pixel detectors that may be installed in vacuum. The remaining stations form the Silicon Tracking System (STS) for the track and momentum reconstruction of all charged particles. They will be built from micro-strip detectors.
(Right) View of the STS/MVD in the dipole magnet with the beam pipe and the vacuum section of the MVD shown.


STS Tracking station layout

The stations are built of sensors arranged in vertical modules with fixed horizontal size of 6cm. The strip length was matched to a maximum occupancy of less then 5% and results in a vertical size of one sensor from 2 to 6 cm. Stereo angle between front and back strips is 15 deg, wchich can be achieve in two setups: one side of the detector has its strips oriented vetricaly, while the other has strips under 15 deg, or strips are rotated by ±7.5 deg on the front and back planes. The arrangement of sensors and modules in a single station is presented in figure below.

station5


STS Performance

Tracking performed with two stations of hybrid pixel detectors (discs, no detailed internal structure yet) and four micro-strip stations of the "vertical" layout.

  • Track reconstruction efficiency
    • as function of the track momentum
    • Track finder: Cellular Automaton and Kalman Filter
    • vertex position included
    • tracks with hits in >3 consecutive stations
    • central URQMD events, Au+Au 25~GeV/nucleon

Track reconstruction efficiency.

  • Momentum resolution
    • as function of a simplified effective silicon detector thickness, taking into account sensors + support/cables etc
    • averaged over all momenta

Momentum resolution
material


MVD station layout

The MAPS based detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid.

MVD Performance together with the STS

  • Spatial resolution of the reconstructed primary and $ D^0 $ decay vertices:

MVD primary and D0 decay vertex resolution.

  • Mass resolution of $ D^0 $ decays with the STS-MVD:

Mass resolution of Do decays with the STS-MVD

  • $ D^0 $ reconstruction in the presence of background.:

D0 reconstruction in the presence of background.

Published articles on the STS/MVD

Follow this link: PublicStsPublishedArticles.


STS/MVD workgroup pages (login required)

Follow these links:


>
>
For the internal STS workgroup pages (login required) follow this link: internal STS workgroup pages.
 

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Revision 10
16 Feb 2009 - Main.AnnaKotynia
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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  The current STS-MVD layout consists of 8 stations that are placed inside a magnetic dipole field which provides the bending power required for momentum determination with an accuracy of about Δp/p = 1%.
Changed:
<
<
The STS comprises 6 detector stations:
  • The stations in 30 and 40 cm distance from the target may consist of hybrid pixel detectors. Those detectors are composed of sensor cells of 50x50 μm2 yielding a spatial resolution of about 15 μm. Sensors and matching readout electronics are placed on two separate chips, interconnected pixel by pixel through microscopic solder balls. Though hybrid pixel detectors are relatively thick and presumably require active cooling in the acceptance, the stations contribute in the current STS concept with unambiguous space points to the track finding where the track densities are high. For the moment we do not carry out ourselves R&D on hybrid pixel detectors.
  • For the stations in 50, 60, 75, and 100 cm distance from the target we consider to use low-mass Silicon micro-strip detectors for the track point measurement. We are conducting R&D on thin double-sided silicon micro-strip detectors with 50 μm strip pitch and a moderately large stereo angle that can serve as building blocks of detector modules for the tracking stations with readout electronics outside of the STS acceptance.
>
>
The STS comprises 8 detector stations:
  • Stations are placed in 30, 35, 40, 50, 60, 75, 95, 100 cm distance from the target fully based on low-mass Silicon micro-strip detectors for the track point measurement. The stations have ladder structure and are build of 300 μm thick double-sided silicon micro strip sensors. To achieve low-mass detector with 60 μm strip pitch read-out electronics is placed at the perimeter of the STS. Signals from sectors are sent through thin capton micro-cables to the front-end boards.
 

The MVD comprises two detector stations:
  • They are located at 5 and 10 cm (alternatively 10 and 20 cm) downstream of the target and will be installed in a vacuum vessel. We plan to use very thin pixel detectors with very high spatial resulution there. Monolithic Active Pixel Sensors (MAPS) with a pixel size of 40x40 μm2, yielding a spatial resolution of 3 μm, and a thickness of 100 μm would perfectly fulfill our requirements concerning vertex resolution which is needed to measure the displaced vertices of D mesons. The R&D on MAPS concentrates on the improvement of radiation hardness and readout speed.
Line: 48 to 47
 
test
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(Left) Schematical cross section of the detector concept. The target is on the left hand side. The first two (or three) stations from the target are the Micro Vertex Detector (MVD). They will be built from thin MAPS pixel detectors that may be installed in vacuum. The remaining stations form the Silicon Tracking System (STS) for the track and momentum reconstruction of all charged particles. They will be built from micro-strip detectors, eventually supported with hybrid pixel detectors.
>
>
(Left) Schematical cross section of the detector concept. The target is on the left hand side. The first two (or three) stations from the target are the Micro Vertex Detector (MVD). They will be built from thin MAPS pixel detectors that may be installed in vacuum. The remaining stations form the Silicon Tracking System (STS) for the track and momentum reconstruction of all charged particles. They will be built from micro-strip detectors.
  (Right) View of the STS/MVD in the dipole magnet with the beam pipe and the vacuum section of the MVD shown.


STS Tracking station layout

Changed:
<
<
The pixel detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid. For the micro-strip tracking stations, two different layouts are currently studied.
>
>
The stations are built of sensors arranged in vertical modules with fixed horizontal size of 6cm. The strip length was matched to a maximum occupancy of less then 5% and results in a vertical size of one sensor from 2 to 6 cm. Stereo angle between front and back strips is 15 deg, wchich can be achieve in two setups: one side of the detector has its strips oriented vetricaly, while the other has strips under 15 deg, or strips are rotated by ±7.5 deg on the front and back planes. The arrangement of sensors and modules in a single station is presented in figure below.
 

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<
  1. The Micro-strip detector modules are "radially" arranged in super-modules around the beam axis.
    micro-strip-station-type1
  2. The tracking stations are built from detector modules that are "vertically" arranged with the strips oriented perpendicular to the main bending plane in the magnetic field.
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micro-strip-station-type2
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station5

 
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Revision 9
13 Feb 2009 - Main.AnnaKotynia
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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The standard STS/MVD detector in the CBM detector simulation.
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>

 
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test
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test
  (Left) Schematical cross section of the detector concept. The target is on the left hand side. The first two (or three) stations from the target are the Micro Vertex Detector (MVD). They will be built from thin MAPS pixel detectors that may be installed in vacuum. The remaining stations form the Silicon Tracking System (STS) for the track and momentum reconstruction of all charged particles. They will be built from micro-strip detectors, eventually supported with hybrid pixel detectors.
(Right) View of the STS/MVD in the dipole magnet with the beam pipe and the vacuum section of the MVD shown.
Line: 152 to 153
 
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Revision 8
16 Dec 2006 - Main.JohannMHeuser
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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The STS comprises 6 detector stations:
Changed:
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  • The stations in 30 and 40 cm distance from the target may consist of hybrid pixel detectors. Those detectors are composed of sensor cells of 50x50 μm2 but are considerably thicker than MAPS. Sensors and matching readout electronics are placed on two separate chips, interconnected pixel by pixel through microscopic solder balls. Though hybrid pixel detectors are relatively thick and presumably require active cooling in the acceptance, the stations contribute in the current STS concept with unambiguous space points to the track finding where the track densities are high. For the moment we do not carry out ourselves R&D on hybrid pixel detectors.
>
>
  • The stations in 30 and 40 cm distance from the target may consist of hybrid pixel detectors. Those detectors are composed of sensor cells of 50x50 μm2 yielding a spatial resolution of about 15 μm. Sensors and matching readout electronics are placed on two separate chips, interconnected pixel by pixel through microscopic solder balls. Though hybrid pixel detectors are relatively thick and presumably require active cooling in the acceptance, the stations contribute in the current STS concept with unambiguous space points to the track finding where the track densities are high. For the moment we do not carry out ourselves R&D on hybrid pixel detectors.
 
  • For the stations in 50, 60, 75, and 100 cm distance from the target we consider to use low-mass Silicon micro-strip detectors for the track point measurement. We are conducting R&D on thin double-sided silicon micro-strip detectors with 50 μm strip pitch and a moderately large stereo angle that can serve as building blocks of detector modules for the tracking stations with readout electronics outside of the STS acceptance.

The MVD comprises two detector stations:
Changed:
<
<
  • They are located at 5 and 10 cm (alternatively 10 and 20 cm) downstream of the target and will be installed in a vacuum vessel. We plan to use very thin pixel detectors with very high spatial resulution there. Monolithic Active Pixel Sensors (MAPS) with a pixel size of 40x40 μm2 and a thickness of 100 μm would perfectly fulfill our requirements concerning vertex resolution which is needed to measure the displaced vertices of D mesons. The R&D on MAPS concentrates on the improvement of radiation hardness and readout speed.
>
>
  • They are located at 5 and 10 cm (alternatively 10 and 20 cm) downstream of the target and will be installed in a vacuum vessel. We plan to use very thin pixel detectors with very high spatial resulution there. Monolithic Active Pixel Sensors (MAPS) with a pixel size of 40x40 μm2, yielding a spatial resolution of 3 μm, and a thickness of 100 μm would perfectly fulfill our requirements concerning vertex resolution which is needed to measure the displaced vertices of D mesons. The R&D on MAPS concentrates on the improvement of radiation hardness and readout speed.
 

Simulations are being performed to optimize the number of STS and MVD stations, their layout and the material budget of the detectors, for efficient track finding, high-resolution momentum measurement and vertex selection. The simulations are closely linked to the detector R&D activities.
Line: 52 to 52
 


STS Tracking station layout

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For the micro-strip tracking stations, two different layouts are currently studied.

  • The pixel detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid.
>
>
The pixel detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid. For the micro-strip tracking stations, two different layouts are currently studied.
 
Changed:
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<
  • The Micro-strip detector modules are "radially" arranged in super-modules around the beam axis.
>
>
  1. The Micro-strip detector modules are "radially" arranged in super-modules around the beam axis.
 
micro-strip-station-type1
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  • The tracking stations are built from detector modules that are "vertically" arranged with the strips oriented perpendicular to the main bending plane in the magnetic field.
>
>
  1. The tracking stations are built from detector modules that are "vertically" arranged with the strips oriented perpendicular to the main bending plane in the magnetic field.
 
micro-strip-station-type2
Revision 7
15 Dec 2006 - Main.JohannMHeuser
Line: 1 to 1
 
META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


Line: 53 to 53
 

STS Tracking station layout

For the micro-strip tracking stations, two different layouts are currently studied.
Changed:
<
<
The pixel detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid.
>
>

  • The pixel detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid.
 

  • The Micro-strip detector modules are "radially" arranged in super-modules around the beam axis.
Revision 6
11 Dec 2006 - Main.JohannMHeuser
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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STS/MVD workgroup pages (login required)

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Follow this link: Internal Pages
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>
Follow these links:
 


Revision 5
11 Dec 2006 - Main.JohannMHeuser
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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Momentum resolution
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material
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material
 


Revision 4
08 Dec 2006 - Main.JohannMHeuser
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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Internal Pages
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STS/MVD workgroup pages (login required)

Follow this link: Internal Pages
 


Revision 3
08 Dec 2006 - Main.FlorianUhlig
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META TOPICPARENT name="WebHome"

Silicon Tracking System and Micro-Vertex Detector


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  Follow this link: PublicStsPublishedArticles.


Added:
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Internal Pages
 

META FILEATTACHMENT attr="h" comment="no comment" date="1164644863" moveby="JohannMHeuser" movedto="Public.PublicSts" movedwhen="1165494201" movefrom="STS.WebHome" name="sts-mvd.gif" path="sts-mvd.gif" size="68694" user="JohannMHeuser" version="1.1"
Revision 2
07 Dec 2006 - Main.JohannMHeuser
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META TOPICPARENT name="WebHome"
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The Silicon Tracking System (STS)

>
>

Silicon Tracking System and Micro-Vertex Detector


 
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Information to be added soon
>
>

Table of Contents
 
Changed:
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-- VolkerFriese - 06 Dec 2006
>
>

Overview of the detector system

The Silicon Tracking System (STS) is the central component of the CBM experiment. It serves for track and momentum measurement of all charged particles produced at the target. Between the target and the STS, a Micro-Vertex Detector (MVD) enables to distinguish particle decay vertices from the event vertex. A benchmark observable is the D meson (“open charm”), a rare probe that has to be identified via its hadronic decays $ D^0 \rightarrow K^-\pi^+ $ and $ D^\pm \rightarrow K^\mp\pi^\pm\pi^\pm $. This challenging task requires a detector with high position resolution, very low material budget, high radiation tolerance and a fast self-triggered readout.
 
Added:
>
>
The current STS-MVD layout consists of 8 stations that are placed inside a magnetic dipole field which provides the bending power required for momentum determination with an accuracy of about Δp/p = 1%.

The STS comprises 6 detector stations:
  • The stations in 30 and 40 cm distance from the target may consist of hybrid pixel detectors. Those detectors are composed of sensor cells of 50x50 μm2 but are considerably thicker than MAPS. Sensors and matching readout electronics are placed on two separate chips, interconnected pixel by pixel through microscopic solder balls. Though hybrid pixel detectors are relatively thick and presumably require active cooling in the acceptance, the stations contribute in the current STS concept with unambiguous space points to the track finding where the track densities are high. For the moment we do not carry out ourselves R&D on hybrid pixel detectors.
  • For the stations in 50, 60, 75, and 100 cm distance from the target we consider to use low-mass Silicon micro-strip detectors for the track point measurement. We are conducting R&D on thin double-sided silicon micro-strip detectors with 50 μm strip pitch and a moderately large stereo angle that can serve as building blocks of detector modules for the tracking stations with readout electronics outside of the STS acceptance.

The MVD comprises two detector stations:
  • They are located at 5 and 10 cm (alternatively 10 and 20 cm) downstream of the target and will be installed in a vacuum vessel. We plan to use very thin pixel detectors with very high spatial resulution there. Monolithic Active Pixel Sensors (MAPS) with a pixel size of 40x40 μm2 and a thickness of 100 μm would perfectly fulfill our requirements concerning vertex resolution which is needed to measure the displaced vertices of D mesons. The R&D on MAPS concentrates on the improvement of radiation hardness and readout speed.

Simulations are being performed to optimize the number of STS and MVD stations, their layout and the material budget of the detectors, for efficient track finding, high-resolution momentum measurement and vertex selection. The simulations are closely linked to the detector R&D activities.


STS/MVD challenge

Au+Au collisions, 25 GeV/nucleon:
  • high track densities:
    600 charged particles in polar acceptance 2.5 - 25 deg
  • high r/o speed, radiation hardness:
    10 MHz interaction rate (109 ions/s on 1% λint target), only high-level triggers.



(Left) Simulation of a central Au+Au collision at 25 GeV/nucleon in the STS.
(Right) Illustration of rare "open charm" decays to be identified as detached vertices in about 100 μm distance from the event vertex.


STS/MVD detector layout

The standard STS/MVD detector in the CBM detector simulation.

test
(Left) Schematical cross section of the detector concept. The target is on the left hand side. The first two (or three) stations from the target are the Micro Vertex Detector (MVD). They will be built from thin MAPS pixel detectors that may be installed in vacuum. The remaining stations form the Silicon Tracking System (STS) for the track and momentum reconstruction of all charged particles. They will be built from micro-strip detectors, eventually supported with hybrid pixel detectors.
(Right) View of the STS/MVD in the dipole magnet with the beam pipe and the vacuum section of the MVD shown.


STS Tracking station layout

For the micro-strip tracking stations, two different layouts are currently studied.
The pixel detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid.

  • The Micro-strip detector modules are "radially" arranged in super-modules around the beam axis.
    micro-strip-station-type1

  • The tracking stations are built from detector modules that are "vertically" arranged with the strips oriented perpendicular to the main bending plane in the magnetic field.
micro-strip-station-type2


STS Performance

Tracking performed with two stations of hybrid pixel detectors (discs, no detailed internal structure yet) and four micro-strip stations of the "vertical" layout.

  • Track reconstruction efficiency
    • as function of the track momentum
    • Track finder: Cellular Automaton and Kalman Filter
    • vertex position included
    • tracks with hits in >3 consecutive stations
    • central URQMD events, Au+Au 25~GeV/nucleon

Track reconstruction efficiency.

  • Momentum resolution
    • as function of a simplified effective silicon detector thickness, taking into account sensors + support/cables etc
    • averaged over all momenta

Momentum resolution material


MVD station layout

The MAPS based detector stations have no detailed layout yet. In the simulation, they are treated as silicon discs segmented into a pixel grid.

MVD Performance together with the STS

  • Spatial resolution of the reconstructed primary and $ D^0 $ decay vertices:

MVD primary and D0 decay vertex resolution.

  • Mass resolution of $ D^0 $ decays with the STS-MVD:

Mass resolution of Do decays with the STS-MVD

  • $ D^0 $ reconstruction in the presence of background.:

D0 reconstruction in the presence of background.

Published articles on the STS/MVD

Follow this link: PublicStsPublishedArticles.



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