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E/p vs p + energy and momentum [message #12985]

Wed, 25 January 2012 11:03

Dmitry Khaneft
Messages: 75
Registered: January 2009

continuous participant

From: *kph.uni-mainz.de

Dear all,

as we agreed on the last evo meeting I attach plots with E/p vs p together with EMC energy and momentum.

pandaroot version = nov11
external packages = may11

emc_raw_lab_3.3_0.0e.eps - EMC energy raw
mom_lab_3.3_0.0e.eps - momentum
p_versus_ep_RAW_3.3_0.0e.eps - E/p vs p (EMC energy raw)

Cheers,
Dmitry

Attachment: emc_raw_lab_3.3_0.0e.eps
(Size: 7.95KB, Downloaded 313 times)
Attachment: mom_lab_3.3_0.0e.eps
(Size: 9.74KB, Downloaded 310 times)
Attachment: p_versus_ep_RAW_3.3_0.0e.eps
(Size: 925.90KB, Downloaded 324 times)

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Re: E/p vs p + energy and momentum [message #12988 is a reply to message #12985]

Wed, 25 January 2012 11:28

Johan Messchendorp
Messages: 693
Registered: April 2007
Location: University of Groningen

first-grade participant

From: *KVI.nl

Hi,

Could you also plot Pmc vs (Eraw-Pmc) .... and Pmc vs (Prec-Pmc)?

Thanks,

Johan.

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Re: E/p vs p + energy and momentum [message #12990 is a reply to message #12985]

Wed, 25 January 2012 13:14

Gianluigi Boca
Messages: 177
Registered: March 2004

first-grade participant

From: *gsi.de

Dmitry Khaneft wrote on Wed, 25 January 2012 11:03

dear Dmitry,
do you understand why the Emc energy plot (emc_raw_lab_3.3_0.0e.eps) has a dip at 3 GeV ? And do you understand that very peculiar momentum distribution (mom_lab_3.3_0.0e.eps) ?
Gianluigi

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Re: E/p vs p + energy and momentum [message #12993 is a reply to message #12990]

Mon, 30 January 2012 17:17

Dmitry Khaneft
Messages: 75
Registered: January 2009

continuous participant

From: *kph.uni-mainz.de

Gianluigi Boca wrote on Wed, 25 January 2012 13:14

Dear Gianluigi,

sorry for the late answer.

This energy drop on the emc_raw_lab_3.3_0.0e.eps plots is explained by the transition from the barrel to forward endcap. Below you will find 3 plots for the backward/forward endcaps and for the barrel.

emc_raw_ba_lab_3.3_0.0e.eps - EMC barrel
emc_raw_bw_lab_3.3_0.0e.eps - EMC backward endcap
emc_raw_fw_lab_3.3_0.0e.eps - EMC forward endcap

As for momentum, I think it is a consequences of momentum distribution of initial electrons and positrons (see mom_neg_lab_3.3_0.0e.eps)

Dmitry

Attachment: emc_raw_ba_lab_3.3_0.0e.eps
(Size: 8.10KB, Downloaded 270 times)
Attachment: emc_raw_bw_lab_3.3_0.0e.eps
(Size: 6.89KB, Downloaded 285 times)
Attachment: emc_raw_fw_lab_3.3_0.0e.eps
(Size: 8.62KB, Downloaded 261 times)
Attachment: mom_neg_lab_3.3_0.0e.eps
(Size: 9.30KB, Downloaded 265 times)

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Re: E/p vs p + energy and momentum [message #12996 is a reply to message #12985]

Tue, 31 January 2012 14:08

Dmitry Khaneft
Messages: 75
Registered: January 2009

continuous participant

From: *kph.uni-mainz.de

Dear all,

I repeat the simulation w/o ideal hypothesis i.e. "recoKalman->SetIdealHyp(kTRUE);" was commented out. As one can see the E/p distribution is much narrower then before.

Can someone explain a kind of line at p=1 GeV on CAL plot where RAW looks pretty smooth?

Cheers,
Dmitry

Attachment: p_versus_ep_CAL_3.3_0.0e.eps
(Size: 803.62KB, Downloaded 291 times)
Attachment: p_versus_ep_RAW_3.3_0.0e.eps
(Size: 797.48KB, Downloaded 324 times)

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