ExperimentFAQ: Difference between revisions
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• Also, with muon to electron conversion, the standard model background rate is ~ 10<sup>-54</sup> while the background for taus is ~10<sup>-14</sup>. Background for mu2e is over 35 orders of magnitude away while taus are only 4-5 orders of magnitude away from the reach of the next generation of experiments (Belle II). | • Also, with muon to electron conversion, the standard model background rate is ~ 10<sup>-54</sup> while the background for taus is ~10<sup>-14</sup>. Background for mu2e is over 35 orders of magnitude away while taus are only 4-5 orders of magnitude away from the reach of the next generation of experiments (Belle II). | ||
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! style="background-color:white;" | What is the DIO end point. Does it include radiative corrections?|| | |||
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| colspan="2"| 104.971 (1) MeV. This Number includes interaction of the incoming muon and the outgoing electron with the nucleus' coulomb field. | |||
Link to research paper https://journals-aps-org.ezp2.lib.umn.edu/prd/abstract/10.1103/PhysRevD.94.051301 | |||
Link to archive https://arxiv.org/abs/1608.05447 | |||
Link to docdb file (internal file) https://mu2e-docdb.fnal.gov/cgi-bin/sso/RetrieveFile?docid=17910&filename=2018-06-07-rad-corr.pdf | |||
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{|class="mw-collapsible mw-collapsed wikitable" | |||
! style="background-color:white;" | what mass scale reach does mu2e would have?|| | |||
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| colspan="2"| Mu2e will probe between ~ 2000-10000 TeV, depending if the interaction the produces the conversion is a loop type interaction or contact type interaction. | |||
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== Detector Solenoid == | == Detector Solenoid == | ||
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! style= "background-color: white;" | what is the magnetic field strength in the tracker region?|| | |||
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| colspan="2"| 1 Tesla. | |||
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== Stopping Target == | == Stopping Target == | ||
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| colspan="2"|a panel is 120 degrees arc that holds 96 straws and the electronics (see fig.1). This is our 2nd smallest tracker block (the first being a straw). A plane is made of 6 panels (see fig.2). a station is made of 2 planes, meaning that a station is made of 12 panels (see fig.3) | | colspan="2"|a panel is 120 degrees arc that holds 96 straws and the electronics (see fig.1). This is our 2nd smallest tracker block (the first being a straw). A plane is made of 6 panels (see fig.2). a station is made of 2 planes, meaning that a station is made of 12 panels (see fig.3) | ||
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! style="background-color: white;" | What would the pressure be in tracker? What is the pressure of the gas in the straws?|| | |||
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| colspan="2"|To reduce Multiple scattering, the tracker is in near vacuum with a pressure of 10<sup>-4</sup> Torr. The gas is at 1 atmospheric pressure, equivalent to 51.7149 Torr. | |||
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! style="background-color:white;" | What is the drift gas gain?|| | |||
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| colspan="2"|3-5 × 10<sup>4</sup>. There isn't a precise value for the gain, Lower gain leads to less aging effects on the straws, higher gain leads to better track resolution. The actual value will be decided upon taking data and might also be adjusted through out the experiment. | |||
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! style="background-color:white;" | What are the most likely factors for gas gain loss?|| | |||
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| colspan="2"| Contaminated gas and accumulated charge on the walls of straws. | |||
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| colspan="2"| testing | | colspan="2"| testing | ||
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==Asking Mu2e collaboration (Beta)== | |||
{| class="mw-collapsible mw-collapsed wikitable" | |||
! style="background-color: white;" | Collaborators || | |||
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| colspan="2"| If you can't find your question in the FAQ page, login to you Fermilab account and post it to the wiki. Someone will answer it or direct you to the answer. Don't wonder whether or not it belongs to the FAQ page, if it doesn't someone will put it in the appropriate page. | |||
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! style="background-color: white;" | Non-collaborators || | |||
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| colspan="2"| If you can't find your question in the FAQ page, click the link below to ask it and someone will answer it. | |||
https://goo.gl/forms/AzmfVQmCXcHdDdom1 | |||
|} | |} | ||
[[Category:Experiment]] | [[Category:Experiment]] |
Latest revision as of 13:15, 10 May 2022
Mu2e Newcomer FAQ: Physics and the Experiment
The FAQ section is organized so that questions related to a specific subsystem are grouped together. For example, questions about the tracker and its many parts are found in a section called tracker.
Mu2e Physics
What is Mu2e trying to measure? | Expand |
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What physics beyond the Standard Model could the experiment be sensitive to? | Expand |
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Where did the idea originate? -- answer needed | Expand |
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What competing and complementary measurements are being done by other experiments and what is the current best limit? | Expand |
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Where do the muons come from? | Expand |
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How can we determine the type of interaction that produces muon to electron conversion? | Expand |
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how sensitive is mu2e to the decay of a negative muon to a positron (LVF) (µ- → e+ )? | Expand |
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In case of a signal, will mu2e be able to exclude certain physics models? | Expand |
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Why use muons and not taus, don’t taus have lower rates than muons in many new physics models? | Expand |
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What is the DIO end point. Does it include radiative corrections? | Expand |
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what mass scale reach does mu2e would have? | Expand |
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Mu2e Challenges
What are the primary experimental challenges? | Expand |
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Proton Beam
Production Solenoid
Production Target
Why does the production target have fins? | Expand |
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Extinction Monitor
Transport Solenoid
Why does the TS have two bends instead of one | Expand |
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If the field is only along the axis of the transport solenoid (TS) what makes the muons direction of motion follow the bends of transport solenoid (TS)? | Expand |
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Detector Solenoid
what is the magnetic field strength in the tracker region? | Expand |
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Stopping Target
Was use 34 disks of aluminum for the stopping target? Why not a continuous aluminum disk of the same mass? | Expand |
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Why Aluminum for the stopping target? Is there any other choice? | Expand |
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Tracker
Why put gold on the inside of the drift tubes and not copper? | Expand |
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What is mu2e using for measuring electron energy loss? | Expand |
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Why are the tubes 5 mm in diameter? Was this optimized based on calculation or simulation to get the best momentum resolution? | Expand |
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How was the muon lifetime calculated? Was it measured? | Expand |
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How many tracks do we expect to have over the entire run period? | Expand |
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What is a station, a plane and a panel in the tracker? | Expand |
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What would the pressure be in tracker? What is the pressure of the gas in the straws? | Expand |
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What is the drift gas gain? | Expand |
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What are the most likely factors for gas gain loss? | Expand |
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Calorimeter
Cosmic Ray Veto (CRV)
What is the dead time of the CRV? | Expand |
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Stopping Target Monitor
Why not use characteristic X rays from muons kicking K-shell electrons out to count stopped muons? | Expand |
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Trigger and DAQ
Calibration
Miscellaneous FAQs
How can I learn more about the experiment? | Expand |
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Mu2e Newcomer FAQ: Organization and Logistics
HELP! What does that acronym mean? | Expand |
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How is the Project organized? | Expand |
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How is the Collaboration Organized? | Expand |
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How do collaborators communicate? | Expand |
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Where can documentation be found? | Expand |
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Asking Mu2e collaboration (Beta)
Collaborators | Expand |
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Non-collaborators | Expand |
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