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SoftKiller, a particle-level pileup removal method.

Cacciari M, Salam GP, Soyez G - Eur Phys J C Part Fields (2015)

Bottom Line: It removes the softest particles in an event, up to a transverse momentum threshold that is determined dynamically on an event-by-event basis.In simulations, this simple procedure appears to be reasonably robust and brings superior jet resolution performance compared to existing jet-based approaches.It is also nearly two orders of magnitude faster than methods based on jet areas.

View Article: PubMed Central - PubMed

Affiliation: Université Paris Diderot, Paris, France ; Sorbonne Universités, UPMC Univ Paris 06, UMR 7589, LPTHE, 75005 Paris, France ; CNRS, UMR 7589, LPTHE, 75005 Paris, France.

ABSTRACT

Existing widely used pileup removal approaches correct the momenta of individual jets. In this article we introduce an event-level, particle-based pileup correction procedure, SoftKiller. It removes the softest particles in an event, up to a transverse momentum threshold that is determined dynamically on an event-by-event basis. In simulations, this simple procedure appears to be reasonably robust and brings superior jet resolution performance compared to existing jet-based approaches. It is also nearly two orders of magnitude faster than methods based on jet areas.

No MeSH data available.


Performance of SoftKiller for 50 GeV jets and  Poisson-distributed pileup events. We plot the distribution of the shift  between the jet  after pileup removal and the jet  in the hard event alone. Results are compared between the area-median approach and the SoftKiller. For comparison, the (orange) dash-dotted line corresponds to the situation where no pileup corrections are applied
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Fig4: Performance of SoftKiller for 50 GeV jets and Poisson-distributed pileup events. We plot the distribution of the shift between the jet after pileup removal and the jet in the hard event alone. Results are compared between the area-median approach and the SoftKiller. For comparison, the (orange) dash-dotted line corresponds to the situation where no pileup corrections are applied

Mentions: Next, let us compare the performance of the SoftKiller to that of area–median subtraction. Figure 4 shows the distribution of shift in , for (hard) jets with in a dijet sample. The average number of pileup events is , with a Poisson distribution. One sees that in the SoftKiller approach, the peak is about higher than what is obtained with the area–median approach and the distribution correspondingly narrower. The peak, in this specific case, is well centred on .Fig. 4


SoftKiller, a particle-level pileup removal method.

Cacciari M, Salam GP, Soyez G - Eur Phys J C Part Fields (2015)

Performance of SoftKiller for 50 GeV jets and  Poisson-distributed pileup events. We plot the distribution of the shift  between the jet  after pileup removal and the jet  in the hard event alone. Results are compared between the area-median approach and the SoftKiller. For comparison, the (orange) dash-dotted line corresponds to the situation where no pileup corrections are applied
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4376401&req=5

Fig4: Performance of SoftKiller for 50 GeV jets and Poisson-distributed pileup events. We plot the distribution of the shift between the jet after pileup removal and the jet in the hard event alone. Results are compared between the area-median approach and the SoftKiller. For comparison, the (orange) dash-dotted line corresponds to the situation where no pileup corrections are applied
Mentions: Next, let us compare the performance of the SoftKiller to that of area–median subtraction. Figure 4 shows the distribution of shift in , for (hard) jets with in a dijet sample. The average number of pileup events is , with a Poisson distribution. One sees that in the SoftKiller approach, the peak is about higher than what is obtained with the area–median approach and the distribution correspondingly narrower. The peak, in this specific case, is well centred on .Fig. 4

Bottom Line: It removes the softest particles in an event, up to a transverse momentum threshold that is determined dynamically on an event-by-event basis.In simulations, this simple procedure appears to be reasonably robust and brings superior jet resolution performance compared to existing jet-based approaches.It is also nearly two orders of magnitude faster than methods based on jet areas.

View Article: PubMed Central - PubMed

Affiliation: Université Paris Diderot, Paris, France ; Sorbonne Universités, UPMC Univ Paris 06, UMR 7589, LPTHE, 75005 Paris, France ; CNRS, UMR 7589, LPTHE, 75005 Paris, France.

ABSTRACT

Existing widely used pileup removal approaches correct the momenta of individual jets. In this article we introduce an event-level, particle-based pileup correction procedure, SoftKiller. It removes the softest particles in an event, up to a transverse momentum threshold that is determined dynamically on an event-by-event basis. In simulations, this simple procedure appears to be reasonably robust and brings superior jet resolution performance compared to existing jet-based approaches. It is also nearly two orders of magnitude faster than methods based on jet areas.

No MeSH data available.