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Test of muon momentum resolution with Jan14 release [message #15866]

Wed, 12 February 2014 17:54

binsong
Messages: 10
Registered: December 2011

occasional visitor

From: *in2p3.fr

Dear all,

I have checked the momentum resolution of muon for two angles with the new release (p = 1GeV/c, theta = 15deg and theta = 60 deg).

the result at Barrel region is normal, deltap/p = 1.56%, comparable to the result from TDR.

But, for the Forward region, I found deltap/p = 2.1%, very different from the TDR result which is about 1.5%.

Then, I also checked them with the apr13 release, both of them seem correct.

Has anyone some idea, why the momentum resolution in forward between apr13 and jan14 changes a lot?

Binsong

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Re: Test of muon momentum resolution with Jan14 release [message #15873 is a reply to message #15866]

Mon, 17 February 2014 11:17

Susanna Costanza
Messages: 33
Registered: January 2008
Location: Pavia

continuous participant

From: *pv.infn.it

Dear Binsong,
I've downloaded the jan14 release and I simulated two sets of 1000 events with a momentum of 1 GeV/c; one set was generated at theta = 15 deg and the other one at theta = 60 deg.
For both data sets, I obtain nearly the same resolution: 1.60% at 15 deg and 1.62% at 60 deg, as shown in the plot attached.
So I don't see any difference with respect to the TDR results.
Are you using the macros in the macro/run directory?
Cheers,
Susanna

Attachment: resolution_1GeV.png
(Size: 19.48KB, Downloaded 302 times)

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Re: Test of muon momentum resolution with Jan14 release [message #15874 is a reply to message #15873]

Mon, 17 February 2014 13:32

binsong
Messages: 10
Registered: December 2011

occasional visitor

From: *in2p3.fr

hi Susanna,
Thanks for your answer. The revision I used is 23659, external package is dec13, and the macro in macro/run.

But the result for 15deg is different with yours.

My delta p / p is 2.2%.

Cheers

Attachment: mom_mu_15deg.png
(Size: 19.31KB, Downloaded 306 times)

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Re: Test of muon momentum resolution with Jan14 release [message #15875 is a reply to message #15874]

Mon, 17 February 2014 13:43

Susanna Costanza
Messages: 33
Registered: January 2008
Location: Pavia

continuous participant

From: *pv.infn.it

I'm still using the apr13 release of the external packages.
I'll install the dec13 release and I'll let you know if/how my results change.

Susanna

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Re: Test of muon momentum resolution with Jan14 release [message #15878 is a reply to message #15875]

Mon, 17 February 2014 16:29

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

Hi,
why are you using dec13? It was never announced since it has bugs inside, in this case geane is not working properly.
Please try again with apr13 externals.

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