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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 Go to previous messageGo to previous message
Dmitry Khaneft is currently offline  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 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

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

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