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New method of out-of-time energy subtraction for the CMS hadronic calorimeter

Lawhorn, Jay (2019) New method of out-of-time energy subtraction for the CMS hadronic calorimeter. Journal of Physics: Conference Series, 1162 (1). Art. No. 012036. ISSN 1742-6596. doi:10.1088/1742-6596/1162/1/012036.

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The CMS hadronic calorimeter employs plastic scintillator active material in the barrel and endcap (HBHE). In Run 2, the LHC operates at 13 TeV center-of-mass energy with up to 50 simultaneous collisions per bunch crossing (pileup) and a 25 ns bunch spacing. The HBHE scintillator light pulse is only 60% contained in a 25 ns window, resulting in significant pulse overlap for consecutive events (out-of-time pileup). This talk presents a novel algorithm that will be used in 2018 for subtracting out-of-time pileup in HBHE both online in the software trigger and offline. The algorithm includes methods for both the barrel with hybrid photodiode photosensors and QIE8 digitizers, and the endcap with silicon photomultipliers and QIE11 digitizers, including the challenging charge-dependent pulse shaping effects of the QIEs. The on-detector pulse shape measurement method and results are also shown. The new algorithm is five-to-ten times faster than the previous one, and for the first time CMS will use the offline method at the trigger level.

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Lawhorn, Jay0000-0002-8597-9259
Additional Information:© 2019 Published under licence by IOP Publishing Ltd. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Issue or Number:1
Record Number:CaltechAUTHORS:20190801-124141076
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Official Citation:Jay Lawhorn and CMS HCAL Collaboration 2019 J. Phys.: Conf. Ser. 1162 012036
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97587
Deposited By: Tony Diaz
Deposited On:01 Aug 2019 19:57
Last Modified:12 Jul 2022 16:58

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