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Track perpendicular to Strip/Pixel [message #17704]

Sat, 03 January 2015 03:54

Shyam Kumar
Messages: 78
Registered: September 2012
Location: Mumbai, Maharashtra India

continuous participant

From: 103.21.126*

Hi All,
I have seen a thing when I am running pid_complete.C, there are several time on the screen Track perpendicular to strip pixel not addded to eloss. Is it for only barrel part (lorentz angle shift will be large since B is in Z-direction) or also forward part (lorentz angle shift will be small). Are the sensors skewed by some angles to neutralize the lorentz effect?.

Thank You
Shyam

[Updated on: Sat, 03 January 2015 03:56]

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Re: Track perpendicular to Strip/Pixel [message #17708 is a reply to message #17704]

Sat, 03 January 2015 12:42

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *ip71.fastwebnet.it

Most probably those hits are bad associated by the pattern recognition or maybe the momentum calculation has some problems there.

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Re: Track perpendicular to Strip/Pixel [message #17709 is a reply to message #17708]

Sat, 03 January 2015 13:33

Shyam Kumar
Messages: 78
Registered: September 2012
Location: Mumbai, Maharashtra India

continuous participant

From: 103.21.127*

Hi Stefano,
Thank you for reply, yeah these are bad hits but this effect is neutralized by tilting the sensor as image attached, in which it is shown that the single strip cluster (track perpendicular to strip) can be a multistrip cluster in presence of magnetic field due to lorentz force (hit reconstruction will not be correct) and this effect is neutralized by tilting the sensor. Are the sensors of MVD Tilted to neutralize this effect?

Shyam

Attachment: test.png
(Size: 17.97KB, Downloaded 233 times)

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Re: Track perpendicular to Strip/Pixel [message #17710 is a reply to message #17709]

Sat, 03 January 2015 15:41

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *ip71.fastwebnet.it

These tracks are parallel to the sensor, not perpendicular.
In any case, you need to collect energy on more sensors in order to use center-of-mass technique for a better position resolution. if you hit only one sensor then your resolution will be just size/sqrt(12).

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Re: Track perpendicular to Strip/Pixel [message #17711 is a reply to message #17710]

Sat, 03 January 2015 17:06

Shyam Kumar
Messages: 78
Registered: September 2012
Location: Mumbai, Maharashtra India

continuous participant

From: 103.21.125*

Thank You, Then I am wrong, I was interpreting these tracks are perpendicular.

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