Difference between revisions of "L-PID"
From Hall A Wiki
| (4 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
PID issues: | PID issues: | ||
| − | + | 1,I cut on a small spot on PRL2.vs.PRL1 to select electrons, and look at the L.cer.asum_c (blue line). | |
| − | + | ||
| − | 1,I cut on a small spot on | + | |
As you can see, there still have many low ADC channels in Cerenkov SUM, which means that from Cer, | As you can see, there still have many low ADC channels in Cerenkov SUM, which means that from Cer, | ||
| − | there are still many Pions. | + | there are still many Pions. After I cut on L.cer.asum_c at >300, where the single electron peak is, |
| + | the efficiency of electron already reduces to 97%. | ||
[[Image:L.prl.cer.png]] | [[Image:L.prl.cer.png]] | ||
2, I did the reverse way by cutting on high ADC channels of Cer Sum (4000~5900), which indicates that | 2, I did the reverse way by cutting on high ADC channels of Cer Sum (4000~5900), which indicates that | ||
most of them should be electrons. However, when I cut on the electron peaks of PRL1&2, there are only | most of them should be electrons. However, when I cut on the electron peaks of PRL1&2, there are only | ||
| − | 87% of electrons | + | 87% of electrons. It looks like some pions deposite very big energy in Cerenkov, which does not make |
| + | sence since their energy must be very huge to produce big signals in cerenkov PMTs. | ||
[[Image:L.prl.eff.png]] | [[Image:L.prl.eff.png]] | ||
| Line 15: | Line 15: | ||
to pick electrons, in the beta spectrum, the peak of pion is still very comparable to electron peaks. | to pick electrons, in the beta spectrum, the peak of pion is still very comparable to electron peaks. | ||
[[Image:L.beta.eff.png]] | [[Image:L.beta.eff.png]] | ||
| + | |||
| + | 4, After only applying cut on L.cer.asum_c>4000, which basically can remove most of pion, I plot of L.tr.beta, | ||
| + | and still find that there is a pion peak. | ||
| + | [[Image:L.beta.eff2.png]] | ||
| + | |||
| + | 5, Cerrenkov ADC vs PRL ADC | ||
| + | [[Image:L.cer.prl.png]] | ||
Latest revision as of 11:34, 24 March 2011
PID issues:
1,I cut on a small spot on PRL2.vs.PRL1 to select electrons, and look at the L.cer.asum_c (blue line). As you can see, there still have many low ADC channels in Cerenkov SUM, which means that from Cer, there are still many Pions. After I cut on L.cer.asum_c at >300, where the single electron peak is, the efficiency of electron already reduces to 97%.
2, I did the reverse way by cutting on high ADC channels of Cer Sum (4000~5900), which indicates that most of them should be electrons. However, when I cut on the electron peaks of PRL1&2, there are only 87% of electrons. It looks like some pions deposite very big energy in Cerenkov, which does not make sence since their energy must be very huge to produce big signals in cerenkov PMTs.
3, I look at the L.tr.beta (raw beta before timing calibration). As you can see, even I cut on PRL1.vs.PRL2 to pick electrons, in the beta spectrum, the peak of pion is still very comparable to electron peaks.
4, After only applying cut on L.cer.asum_c>4000, which basically can remove most of pion, I plot of L.tr.beta, and still find that there is a pion peak.
5, Cerrenkov ADC vs PRL ADC
