Difference between revisions of "L-PID"
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| + | PID issues: | ||
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| + | 1,I cut on a small spot on PRL2vs.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. | ||
[[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 | ||
| + | most of them should be electrons. However, when I cut on the electron peaks of PRL1&2, there are only | ||
| + | 87% of electrons | ||
[[Image:L.prl.eff.png]] | [[Image:L.prl.eff.png]] | ||
| + | |||
| + | 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. | ||
[[Image:L.beta.eff.png]] | [[Image:L.beta.eff.png]] | ||
Revision as of 18:09, 23 March 2011
PID issues:
1,I cut on a small spot on PRL2vs.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.
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
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.
