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Proceedings 2019, 10(1), 26; https://doi.org/10.3390/proceedings2019010026

Improved Event Mixing for Resonance Yield Extraction

Division of Particle Physics, Department of Physics, Lund University, lSE-221 00 Lund, Sweden
Presented at Hot Quarks 2018—Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions, Texel, The Netherlands, 7–14 September 2018.
Published: 15 April 2019
PDF [516 KB, uploaded 15 April 2019]

Abstract

Resonance particles, such as the K*(892) meson, are reconstructed from the invariant mass (M i n v ) distribution of possible particle pairs. To extract the yield with the highest precision, the combinatorial background must be determined as precisely as possible. An event-mixed M i n v distribution is often used to describe the combinatorial background. However, this distribution will not contain the mini-jet-like structures present inside an event. This analysis introduces a new re-weighing scheme, where two M i n v distributions of like-sign particles in the same-event and in mixed-events are used to correct the mixed-event background estimate for the mini-jet-like structure. Using PYTHIA 8.2 generated proton-proton collisions at s NN = 5.02 TeV, it is shown that the new method can be used to more accurately describe the combinatorial background.
Keywords: experimental techniques; resonance yield extraction; event mixing experimental techniques; resonance yield extraction; event mixing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nassirpour, A.F. Improved Event Mixing for Resonance Yield Extraction. Proceedings 2019, 10, 26.

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