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Improving topological cluster reconstruction using calorimeter cell timing in ATLAS

Aad, G.·Abbott, B. (ORCID:0000000258882734)·Abeling, K. (ORCID:0000000210021652)·Abicht, N. J. (ORCID:0000000157632760)·Abidi, S. H. (ORCID:0000000284969294)·Aboulhorma, A. (ORCID:0000000299872292)·Abramowicz, H. (ORCID:0000000153296640)·Abreu, H. (ORCID:0000000215992896)·Abulaiti, Y. (ORCID:0000000304033697)·Acharya, B. S. (ORCID:0000000285889157)·Bourdarios, C. Adam (ORCID:0000000226344958)·Adamczyk, L. (ORCID:0000000258592075)·Addepalli, S. V. (ORCID:0000000229196663)·Addison, M. J. (ORCID:0000000283873661)·Adelman, J. (ORCID:0000000210413496)·Adiguzel, A. (ORCID:0000000166440517)·Adye, T. (ORCID:0000000306275059)·Affolder, A. A. (ORCID:0000000290587217)·Afik, Y. (ORCID:000000018102356X)·Agaras, M. N. (ORCID:0000000243555589)·Agarwala, J. (ORCID:0000000247547455)·Aggarwal, A. (ORCID:0000000219222039)·Agheorghiesei, C. (ORCID:0000000336951847)·Ahmad, A. (ORCID:0000000186380582)·Ahmadov, F. (ORCID:000000033644540X)·Ahmed, W. S. (ORCID:0000000301283279)·Ahuja, S. (ORCID:0000000343689285)·Ai, X. (ORCID:0000000338562415)·Aielli, G. (ORCID:0000000205738114)·Aikot, A. (ORCID:0000000165786890)·Tamlihat, M. Ait (ORCID:0000000213224666)·Aitbenchikh, B. (ORCID:0000000280201181)·Aizenberg, I. (ORCID:0000000321501624)·Akbiyik, M. (ORCID:0000000273423130)·Åkesson, T. A. (ORCID:0000000341415408)·Akimov, A. V. (ORCID:0000000228462958)·Akiyama, D. (ORCID:0000000176236421)·Akolkar, N. N. (ORCID:0000000334242123)·Aktas, S. (ORCID:0000000282506501)·Khoury, K. Al (ORCID:0000000205478199)·Alberghi, G. L. (ORCID:000000032388987X)·Albert, J. (ORCID:0000000302532505)·Albicocco, P. (ORCID:0000000164301038)·Albouy, G. L. (ORCID:0000000308300107)·Alderweireldt, S. (ORCID:0000000282247036)·Aleksa, M. (ORCID:0000000219369217)·Aleksandrov, I. N. (ORCID:0000000173816762)·Alexa, C. (ORCID:0000000309227669)·Alexopoulos, T. (ORCID:000000028977279X)·Alfonsi, F. (ORCID:0000000209660211)·Algren, M. (ORCID:0000000317931787)·Alhroob, M. (ORCID:0000000175697111)·Ali, B. (ORCID:0000000186535556)·Ali, H. J. (ORCID:0000000245077349)·Ali, S. (ORCID:0000000152163133)·Alibocus, S. W. (ORCID:0000000293778852)·Aliev, M. (ORCID:0000000290123746)·Alimonti, G. (ORCID:0000000271289046)·Alkakhi, W. (ORCID:0000000193554245)·Allaire, C. (ORCID:000000034745538X)·Allbrooke, B. M. (ORCID:0000000257382471)·Allen, J. F. (ORCID:0000000199907486)·Flores, C. Allendes (ORCID:0000000215093217)·Allport, P. P. (ORCID:0000000173032570)·Aloisio, A. (ORCID:0000000238836693)·Alonso, F. (ORCID:0000000194318156)·Alpigiani, C. (ORCID:0000000276415814)·Estevez, M. Alvarez (ORCID:0000000281816532)·Fernandez, A. Alvarez (ORCID:0000000315254620)·Cardoso, M. Alves (ORCID:000000020042292X)·Alviggi, M. G. (ORCID:000000030026982X)·Aly, M. (ORCID:0000000330433715)·Coutinho, Y. Amaral (ORCID:0000000217987230)·Ambler, A. (ORCID:0000000321843480)·Amelung, C.·Amerl, M. (ORCID:0000000311557982)·Ames, C. G. (ORCID:0000000221264246)·Amidei, D. (ORCID:0000000268140355)·Dos Santos, S. Amor (ORCID:0000000175666067)·Amos, K. R. (ORCID:0000000317575620)·Ananiev, V. (ORCID:0000000336497621)·Anastopoulos, C. (ORCID:0000000315875830)·Andeen, T. (ORCID:000000024413871X)·Anders, J. K. (ORCID:0000000218460262)·Andrean, S. Y. (ORCID:0000000297662670)·Andreazza, A. (ORCID:0000000151615759)·Angelidakis, S. (ORCID:0000000282746118)·Angerami, A. (ORCID:0000000178348750)·Anisenkov, A. V. (ORCID:0000000272015936)·Annovi, A. (ORCID:0000000246494398)·Antel, C. (ORCID:0000000196830890)·Anthony, M. T. (ORCID:0000000252700143)·Antipov, E. (ORCID:0000000266787665)·Antonelli, M. (ORCID:0000000222935726)·Anulli, F. (ORCID:000000032734130X)·Aoki, M. (ORCID:0000000174980097)·Aoki, T. (ORCID:0000000266185170)·Pozo, J. Aparisi (ORCID:0000000174014331)·Aparo, M. A. (ORCID:0000000346757810)·Bella, L. Aperio (ORCID:0000000339421702)
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Abstract

Clusters of topologically connected calorimeter cells around cells with large absolute signal-to-noise ratio (topo-clusters) are the basis for calorimeter signal recon struction in the ATLAS experiment. Topological cell clus tering has proven performant in LHC Runs 1 and 2. It is, however, susceptible to out-of-time pile-up of signals from soft collisions outside the 25 ns proton-bunch-crossing window associated with the event’s hard collision. To reduce this effect, a calorimeter-cell timing criterion was added to the signal-to-noise ratio requirement in the clustering algorithm. Multiple versions of this criterion were tested by reconstructing hadronic signals in simulated events and Run 2 ATLAS data. The preferred version is found to reduce the out-of-time pile-up jet multiplicity by ~50% for jet p T ~ 20 GeV and by ~80% for jet p T ≳ 50 GeV, while not disrupting the reconstruction of hadronic signals of interest, and improving the jet energy resolution by up to 5% for 20 < p T < 30 GeV. Pile-up is also suppressed for other physics objects based on topo-clusters (electrons, photons, τ-leptons), reducing the overall event size on disk by about 6% in early Run 3 pile up conditions. Offline reconstruction for Run 3 includes the timing requirement.

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Aad, G., Abbott, B. (ORCID:0000000258882734), Abeling, K. (ORCID:0000000210021652), Abicht, N. J. (ORCID:0000000157632760), Abidi, S. H. (ORCID:0000000284969294), Aboulhorma, A. (ORCID:0000000299872292), Abramowicz, H. (ORCID:0000000153296640), Abreu, H. (ORCID:0000000215992896), Abulaiti, Y. (ORCID:0000000304033697), Acharya, B. S. (ORCID:0000000285889157), Bourdarios, C. Adam (ORCID:0000000226344958), Adamczyk, L. (ORCID:0000000258592075), Addepalli, S. V. (ORCID:0000000229196663), Addison, M. J. (ORCID:0000000283873661), Adelman, J. (ORCID:0000000210413496), Adiguzel, A. (ORCID:0000000166440517), Adye, T. (ORCID:0000000306275059), Affolder, A. A. (ORCID:0000000290587217), Afik, Y. (ORCID:000000018102356X), Agaras, M. N. (ORCID:0000000243555589), Agarwala, J. (ORCID:0000000247547455), Aggarwal, A. (ORCID:0000000219222039), Agheorghiesei, C. (ORCID:0000000336951847), Ahmad, A. (ORCID:0000000186380582), Ahmadov, F. (ORCID:000000033644540X), Ahmed, W. S. (ORCID:0000000301283279), Ahuja, S. (ORCID:0000000343689285), Ai, X. (ORCID:0000000338562415), Aielli, G. (ORCID:0000000205738114), Aikot, A. (ORCID:0000000165786890), Tamlihat, M. Ait (ORCID:0000000213224666), Aitbenchikh, B. (ORCID:0000000280201181), Aizenberg, I. (ORCID:0000000321501624), Akbiyik, M. (ORCID:0000000273423130), Åkesson, T. A. (ORCID:0000000341415408), Akimov, A. V. (ORCID:0000000228462958), Akiyama, D. (ORCID:0000000176236421), Akolkar, N. N. (ORCID:0000000334242123), Aktas, S. (ORCID:0000000282506501), Khoury, K. Al (ORCID:0000000205478199), Alberghi, G. L. (ORCID:000000032388987X), Albert, J. (ORCID:0000000302532505), Albicocco, P. (ORCID:0000000164301038), Albouy, G. L. (ORCID:0000000308300107), Alderweireldt, S. (ORCID:0000000282247036), Aleksa, M. (ORCID:0000000219369217), Aleksandrov, I. N. (ORCID:0000000173816762), Alexa, C. (ORCID:0000000309227669), Alexopoulos, T. (ORCID:000000028977279X), Alfonsi, F. (ORCID:0000000209660211), Algren, M. (ORCID:0000000317931787), Alhroob, M. (ORCID:0000000175697111), Ali, B. (ORCID:0000000186535556), Ali, H. J. (ORCID:0000000245077349), Ali, S. (ORCID:0000000152163133), Alibocus, S. W. (ORCID:0000000293778852), Aliev, M. (ORCID:0000000290123746), Alimonti, G. (ORCID:0000000271289046), Alkakhi, W. (ORCID:0000000193554245), Allaire, C. (ORCID:000000034745538X), Allbrooke, B. M. (ORCID:0000000257382471), Allen, J. F. (ORCID:0000000199907486), Flores, C. Allendes (ORCID:0000000215093217), Allport, P. P. (ORCID:0000000173032570), Aloisio, A. (ORCID:0000000238836693), Alonso, F. (ORCID:0000000194318156), Alpigiani, C. (ORCID:0000000276415814), Estevez, M. Alvarez (ORCID:0000000281816532), Fernandez, A. Alvarez (ORCID:0000000315254620), Cardoso, M. Alves (ORCID:000000020042292X), Alviggi, M. G. (ORCID:000000030026982X), Aly, M. (ORCID:0000000330433715), Coutinho, Y. Amaral (ORCID:0000000217987230), Ambler, A. (ORCID:0000000321843480), Amelung, C., Amerl, M. (ORCID:0000000311557982), Ames, C. G. (ORCID:0000000221264246), Amidei, D. (ORCID:0000000268140355), Dos Santos, S. Amor (ORCID:0000000175666067), Amos, K. R. (ORCID:0000000317575620), Ananiev, V. (ORCID:0000000336497621), Anastopoulos, C. (ORCID:0000000315875830), Andeen, T. (ORCID:000000024413871X), Anders, J. K. (ORCID:0000000218460262), Andrean, S. Y. (ORCID:0000000297662670), Andreazza, A. (ORCID:0000000151615759), Angelidakis, S. (ORCID:0000000282746118), Angerami, A. (ORCID:0000000178348750), Anisenkov, A. V. (ORCID:0000000272015936), Annovi, A. (ORCID:0000000246494398), Antel, C. (ORCID:0000000196830890), Anthony, M. T. (ORCID:0000000252700143), Antipov, E. (ORCID:0000000266787665), Antonelli, M. (ORCID:0000000222935726), Anulli, F. (ORCID:000000032734130X), Aoki, M. (ORCID:0000000174980097), Aoki, T. (ORCID:0000000266185170), Pozo, J. Aparisi (ORCID:0000000174014331), Aparo, M. A. (ORCID:0000000346757810), Bella, L. Aperio (ORCID:0000000339421702). 2024-05-03. Improving topological cluster reconstruction using calorimeter cell timing in ATLAS. https://doi.org/10.1140/epjc%2Fs10052-024-12657-1

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