Abstract
Hadrons have finite interaction size with dense material, a basic feature common to known forms of hadronic calorimeters (HCAL). We argue that substructure variables cannot use HCAL information to access the microscopic nature of jets much narrower than the hadronic shower size, which we call superboosted massive jets. It implies that roughly 15% of their transverse energy profile remains inaccessible due to the presence of long-lived neutral hadrons. This part of the jet substructure is also subject to order-one fluctuations. We demonstrate that the effects of the fluctuations are not reduced when a global correction to jet variables is applied. The above leads to fundamental limitations in the ability to extract intrinsic information from jets in the superboosted regime. The neutral fraction of a jet is correlated with its flavor. This leads to an interesting and possibly useful difference between superboosted W/. Z/. h/. t jets and their corresponding backgrounds. The QCD jets that form the background to the signal superboosted jets might also be qualitatively different in their substructure as their mass might lie at or below the Sudakov mass peak. Finally, we introduce a set of zero-cone longitudinal jet substructure variables and show that while they carry information that might be useful in certain situations, they are not in general sensitive to the jet substructure.
| Original language | English |
|---|---|
| Pages (from-to) | 137-141 |
| Number of pages | 5 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 756 |
| DOIs | |
| Publication status | Published - 2016 May 10 |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
Hadronic calorimeter shower size : Challenges and opportunities for jet substructure in the superboosted regime. / Bressler, Shikma; Flacke, Thomas; Kats, Yevgeny; Lee, Seung Joon; Perez, Gilad.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 756, 10.05.2016, p. 137-141.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hadronic calorimeter shower size
T2 - Challenges and opportunities for jet substructure in the superboosted regime
AU - Bressler, Shikma
AU - Flacke, Thomas
AU - Kats, Yevgeny
AU - Lee, Seung Joon
AU - Perez, Gilad
PY - 2016/5/10
Y1 - 2016/5/10
N2 - Hadrons have finite interaction size with dense material, a basic feature common to known forms of hadronic calorimeters (HCAL). We argue that substructure variables cannot use HCAL information to access the microscopic nature of jets much narrower than the hadronic shower size, which we call superboosted massive jets. It implies that roughly 15% of their transverse energy profile remains inaccessible due to the presence of long-lived neutral hadrons. This part of the jet substructure is also subject to order-one fluctuations. We demonstrate that the effects of the fluctuations are not reduced when a global correction to jet variables is applied. The above leads to fundamental limitations in the ability to extract intrinsic information from jets in the superboosted regime. The neutral fraction of a jet is correlated with its flavor. This leads to an interesting and possibly useful difference between superboosted W/. Z/. h/. t jets and their corresponding backgrounds. The QCD jets that form the background to the signal superboosted jets might also be qualitatively different in their substructure as their mass might lie at or below the Sudakov mass peak. Finally, we introduce a set of zero-cone longitudinal jet substructure variables and show that while they carry information that might be useful in certain situations, they are not in general sensitive to the jet substructure.
AB - Hadrons have finite interaction size with dense material, a basic feature common to known forms of hadronic calorimeters (HCAL). We argue that substructure variables cannot use HCAL information to access the microscopic nature of jets much narrower than the hadronic shower size, which we call superboosted massive jets. It implies that roughly 15% of their transverse energy profile remains inaccessible due to the presence of long-lived neutral hadrons. This part of the jet substructure is also subject to order-one fluctuations. We demonstrate that the effects of the fluctuations are not reduced when a global correction to jet variables is applied. The above leads to fundamental limitations in the ability to extract intrinsic information from jets in the superboosted regime. The neutral fraction of a jet is correlated with its flavor. This leads to an interesting and possibly useful difference between superboosted W/. Z/. h/. t jets and their corresponding backgrounds. The QCD jets that form the background to the signal superboosted jets might also be qualitatively different in their substructure as their mass might lie at or below the Sudakov mass peak. Finally, we introduce a set of zero-cone longitudinal jet substructure variables and show that while they carry information that might be useful in certain situations, they are not in general sensitive to the jet substructure.
UR - http://www.scopus.com/inward/record.url?scp=84960510456&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84960510456&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2016.02.068
DO - 10.1016/j.physletb.2016.02.068
M3 - Article
AN - SCOPUS:84960510456
VL - 756
SP - 137
EP - 141
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -