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phase2:experts [2015/01/27 09:54] – dsalerno | phase2:experts [2015/01/28 09:42] (current) – dsalerno | ||
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* [[phase2: | * [[phase2: | ||
* [[phase2: | * [[phase2: | ||
+ | * [[phase2: | ||
+ | * [[phase2: | ||
Comparison of different scenarios | Comparison of different scenarios | ||
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B-jet ID (Yong+Thea): | B-jet ID (Yong+Thea): | ||
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+ | [[phase2: | ||
0) Are we treating the sign of the impact parameter in the tagger the correct way ? | 0) Are we treating the sign of the impact parameter in the tagger the correct way ? | ||
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Jet-ID (Andreas): | Jet-ID (Andreas): | ||
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+ | [[phase2: | ||
1) Is particle flow being used in the jet energy calculation ? | 1) Is particle flow being used in the jet energy calculation ? | ||
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1) What is the eta distribution of the 4 jets from HH -> bb decay ? | 1) What is the eta distribution of the 4 jets from HH -> bb decay ? | ||
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+ | {{: | ||
2) What is the eta distribution of the most central jet ? The second | 2) What is the eta distribution of the most central jet ? The second | ||
most central jet ? The third most central jet ? The most forward jet ? | most central jet ? The third most central jet ? The most forward jet ? | ||
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+ | Most central jet: | ||
+ | {{: | ||
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+ | Second most central jet: | ||
+ | {{: | ||
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+ | Third most central jet: | ||
+ | {{: | ||
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+ | Most forward jet: | ||
+ | {{: | ||
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3) From (2) above, can we define eta regions we are most interested in | 3) From (2) above, can we define eta regions we are most interested in | ||
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4) What is the median track PT in the most central jet ? The second | 4) What is the median track PT in the most central jet ? The second | ||
most central jet ? The third most central jet ? The most forward jet ? | most central jet ? The third most central jet ? The most forward jet ? | ||
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+ | Median track PT in most central jet: | ||
+ | {{: | ||
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+ | Median track PT in second most central jet: | ||
+ | {{: | ||
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+ | Median track PT in third most central jet: | ||
+ | {{: | ||
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+ | Median track PT in most forward jet: | ||
+ | {{: | ||
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5) From (4) above, can we define track PT regions that we are most interested | 5) From (4) above, can we define track PT regions that we are most interested | ||
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2) remove an outer tracker layer (the 5th one or 2nd one) in one design and see | 2) remove an outer tracker layer (the 5th one or 2nd one) in one design and see | ||
the effect on resolutions | the effect on resolutions | ||
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+ | Removing one layer from the outer tracker did not affect in a relevant way the resolution. The effect on the impact parameter resolution is negligible. The pt resolution results to be degraded a bit. More details under " | ||
3) what is the effect on resolution of doubling the material in the pixel material configuration | 3) what is the effect on resolution of doubling the material in the pixel material configuration | ||
by just doubling the mass of all the components ? | by just doubling the mass of all the components ? | ||
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+ | Resolutions degrade (look at " | ||
4) what is the effect if we instead approximate the doubling of the material by | 4) what is the effect if we instead approximate the doubling of the material by | ||
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resolution (10 times bigger). | resolution (10 times bigger). | ||
- | 5) Are (3) and (4) consistent ? | + | Resolutions degrade in this case as well, but less wrt the previous solution (look at " |
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+ | 5) Are (3) and (4) consistent ? | ||
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+ | They are not consistent, it is better to have a thicker sensor with respect to having heavier component material. | ||
7) * Can we implement tilted pixel modules - perhaps in the FPIX region ? | 7) * Can we implement tilted pixel modules - perhaps in the FPIX region ? | ||
- | There are examples on how to do this in Mersi’s private area. | + | There are examples on how to do this in Mersi’s private area. |
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+ | Possible for the barrel, not possible for the end cap. See page " | ||
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to charm jets and light jets and b-jet id to b-jets. | to charm jets and light jets and b-jet id to b-jets. | ||
b-jet, charm-jet, light jet b-tag parametrizations. | b-jet, charm-jet, light jet b-tag parametrizations. | ||
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+ | ============= Exciting observations ============== | ||
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+ | Everyone can add your observations here : | ||
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+ | * To b-tag all 4 jets in HH->bbb @ 95% (?) efficiency, we need to consider b-tagging out to Eta < 4 (Ben) | ||
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+ | 1) TEST | ||
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+ | Check efficiency at parton level cutting on |eta| < 1, |eta| < 2, |eta| < 3: | ||
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+ | First most central parton: | ||
+ | {{: | ||
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+ | Second most central parton: | ||
+ | {{: | ||
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+ | Third most central parton: | ||
+ | {{: | ||
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+ | Most forward parton: | ||
+ | {{: | ||
+ |