Papers
Topics
Authors
Recent
Search
2000 character limit reached

Multiplicity Based Background Subtraction for Jets in Heavy Ion Collisions

Published 8 Feb 2024 in hep-ex and nucl-ex | (2402.10945v1)

Abstract: Jet measurements in heavy ion collisions at low jet momentum can provide constraints on the properties of the quark gluon plasma but are overwhelmed by a significant, fluctuating background. We build upon our previous work which demonstrated the ability of the jet multiplicity method to extend jet measurements into the domain of low jet momentum [1, Mengel:2023]. We extend this method to a wide range of jet resolution parameters. We investigate the over-complexity of non-interpretable machine learning used to tackle the problem of jet background subtraction through network optimization. Finally, we show that the resulting shallow neural network is able to learn the underlying relationship between jet multiplicity and background fluctuations, with a lesser complexity, reinforcing the utility of interpretable methods.

Definition Search Book Streamline Icon: https://streamlinehq.com
References (46)
  1. K. Adcox et al. (PHENIX), Formation of dense partonic matter in relativistic nucleus nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration, Nucl. Phys. A757, 184 (2005), arXiv:nucl-ex/0410003 .
  2. J. Adams et al. (STAR), Experimental and theoretical challenges in the search for the quark gluon plasma: The STAR collaboration’s critical assessment of the evidence from RHIC collisions, Nucl. Phys. A757, 102 (2005), arXiv:nucl-ex/0501009 .
  3. B. B. Back et al., The PHOBOS perspective on discoveries at RHIC, Nucl. Phys. A757, 28 (2005), arXiv:nucl-ex/0410022 .
  4. I. Arsene et al. (BRAHMS), Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment, Nucl. Phys. A757, 1 (2005), arXiv:nucl-ex/0410020 .
  5. G. Aad et al. (ATLAS), Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at sNN=2.76subscript𝑠NN2.76\sqrt{s_{\mathrm{NN}}}=2.76square-root start_ARG italic_s start_POSTSUBSCRIPT roman_NN end_POSTSUBSCRIPT end_ARG = 2.76 TeV with the ATLAS Detector, Phys. Rev. Lett. 114, 072302 (2015), arXiv:1411.2357 [hep-ex] .
  6. K. Aamodt et al. (ALICE), Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sN⁢N=subscript𝑠𝑁𝑁absent\sqrt{s_{NN}}=square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 2.76 TeV, Phys. Lett. B 696, 30 (2011), arXiv:1012.1004 [nucl-ex] .
  7. K. M. Burke et al. (JET), Extracting the jet transport coefficient from jet quenching in high-energy heavy-ion collisions, Phys.Rev. C90, 014909 (2014), arXiv:1312.5003 [nucl-th] .
  8. S. Cao et al. (JETSCAPE), Determining the jet transport coefficient q from inclusive hadron suppression measurements using Bayesian parameter estimation, Phys. Rev. C 104, 024905 (2021), arXiv:2102.11337 [nucl-th] .
  9. S. A. Voloshin, A. M. Poskanzer, and R. Snellings, Collective phenomena in non-central nuclear collisions, Landolt-Bornstein 23, 293 (2010), arXiv:0809.2949 [nucl-ex] .
  10. L. Adamczyk et al. (STAR), Jet-Hadron Correlations in sN⁢N=200subscript𝑠𝑁𝑁200\sqrt{s_{NN}}=200square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 200 GeV p+p𝑝𝑝p+pitalic_p + italic_p and Central A⁢u+A⁢u𝐴𝑢𝐴𝑢Au+Auitalic_A italic_u + italic_A italic_u Collisions, Phys. Rev. Lett. 112, 122301 (2014), arXiv:1302.6184 [nucl-ex] .
  11. B. Abelev et al. (ALICE), Measurement of Event Background Fluctuations for Charged Particle Jet Reconstruction in Pb-Pb collisions at sN⁢N=2.76subscript𝑠𝑁𝑁2.76\sqrt{s_{NN}}=2.76square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 2.76 TeV, JHEP 03, 053, arXiv:1201.2423 [hep-ex] .
  12. C. Hughes, A. C. Oliveira Da Silva, and C. Nattrass, Model studies of fluctuations in the background for jets in heavy ion collisions, Phys. Rev. C 106, 044915 (2022), arXiv:2005.02320 [hep-ph] .
  13. G. Soyez, Jet areas as a tool for background subtraction, in 25th Winter Workshop on Nuclear Dynamics (2009) arXiv:0905.2851 [hep-ph] .
  14. B. Abelev et al. (ALICE), Measurement of charged jet suppression in Pb-Pb collisions at sN⁢Nsubscript𝑠𝑁𝑁\sqrt{s_{NN}}square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 2.76 TeV, JHEP 03, 013, arXiv:1311.0633 [nucl-ex] .
  15. J. Adam et al. (ALICE), Measurement of jet suppression in central Pb-Pb collisions at sNNsubscript𝑠NN\sqrt{s_{\rm NN}}square-root start_ARG italic_s start_POSTSUBSCRIPT roman_NN end_POSTSUBSCRIPT end_ARG = 2.76 TeV, Phys. Lett. B 746, 1 (2015), arXiv:1502.01689 [nucl-ex] .
  16. S. Acharya et al. (ALICE), Measurements of inclusive jet spectra in pp and central Pb-Pb collisions at sNNsubscript𝑠NN\sqrt{s_{\rm{NN}}}square-root start_ARG italic_s start_POSTSUBSCRIPT roman_NN end_POSTSUBSCRIPT end_ARG = 5.02 TeV, Phys. Rev. C 101, 034911 (2020a), arXiv:1909.09718 [nucl-ex] .
  17. J. Adam et al. (STAR), Measurement of inclusive charged-particle jet production in Au + Au collisions at sN⁢N=subscript𝑠𝑁𝑁absent\sqrt{s_{NN}}=square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG =200 GeV, Phys. Rev. C 102, 054913 (2020), arXiv:2006.00582 [nucl-ex] .
  18. J. A. Hanks et al., Method for separating jets and the underlying event in heavy ion collisions at the BNL Relativistic Heavy Ion Collider, Phys. Rev. C 86, 024908 (2012), arXiv:1203.1353 [nucl-ex] .
  19. V. Khachatryan et al. (CMS), Measurement of inclusive jet cross sections in p⁢p𝑝𝑝ppitalic_p italic_p and PbPb collisions at sN⁢N=subscript𝑠𝑁𝑁absent\sqrt{s_{NN}}=square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 2.76 TeV, Phys. Rev. C 96, 015202 (2017), arXiv:1609.05383 [nucl-ex] .
  20. G. Aad et al. (ATLAS), Measurement of the jet radius and transverse momentum dependence of inclusive jet suppression in lead-lead collisions at sN⁢Nsubscript𝑠𝑁𝑁\sqrt{s_{NN}}square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG= 2.76 TeV with the ATLAS detector, Phys. Lett. B 719, 220 (2013), arXiv:1208.1967 [hep-ex] .
  21. P. Achenbach et al., The Present and Future of QCD (2023) arXiv:2303.02579 [hep-ph] .
  22. R. Haake and C. Loizides, Machine Learning based jet momentum reconstruction in heavy-ion collisions, Phys. Rev. C 99, 064904 (2019), arXiv:1810.06324 [nucl-ex] .
  23. Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at sNNsubscript𝑠NN\sqrt{s_{\rm NN}}square-root start_ARG italic_s start_POSTSUBSCRIPT roman_NN end_POSTSUBSCRIPT end_ARG = 5.02 TeV,   (2023), arXiv:2303.00592 [nucl-ex] .
  24. M. Tannenbaum, The distribution function of the event-by-event average pt for statistically independent emission, Physics Letters B 498, 29 (2001).
  25. C. Hughes and T. Mengel, Github: TennGen (2019).
  26. T. Mengel and C. Hughes, Github: tenngen200 (2022).
  27. A. Adare et al. (PHENIX), Spectra and ratios of identified particles in Au+Au and d𝑑ditalic_d+Au collisions at sN⁢N=200subscript𝑠𝑁𝑁200\sqrt{s_{NN}}=200square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 200 GeV, Phys. Rev. C 88, 024906 (2013), arXiv:1304.3410 [nucl-ex] .
  28. A. Adare et al. (PHENIX), Measurement of the higher-order anisotropic flow coefficients for identified hadrons in Au+++Au collisions at sN⁢Nsubscript𝑠𝑁𝑁\sqrt{s_{{}_{NN}}}square-root start_ARG italic_s start_POSTSUBSCRIPT start_FLOATSUBSCRIPT italic_N italic_N end_FLOATSUBSCRIPT end_POSTSUBSCRIPT end_ARG = 200 GeV, Phys. Rev. C 93, 051902 (2016a), arXiv:1412.1038 [nucl-ex] .
  29. J. Adam et al. (ALICE), Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at sNNsubscript𝑠NN\sqrt{s_{\rm NN}}square-root start_ARG italic_s start_POSTSUBSCRIPT roman_NN end_POSTSUBSCRIPT end_ARG = 2.76 TeV, JHEP 09, 164, arXiv:1606.06057 [nucl-ex] .
  30. K. Aamodt et al. (ALICE Collaboration), Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at sN⁢Nsubscript𝑠𝑁𝑁\sqrt{s_{NN}}square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 2.76 TeV, Phys. Rev. Lett. 106, 032301. 14 p (2010).
  31. T. Sjostrand, S. Mrenna, and P. Z. Skands, A Brief Introduction to PYTHIA 8.1, Comput. Phys. Commun. 178, 852 (2008), arXiv:0710.3820 [hep-ph] .
  32. P. Skands, S. Carrazza, and J. Rojo, Tuning PYTHIA 8.1: the Monash 2013 Tune, Eur. Phys. J. C 74, 3024 (2014), arXiv:1404.5630 [hep-ph] .
  33. M. Cacciari, G. P. Salam, and G. Soyez, FastJet User Manual, Eur. Phys. J. C 72, 1896 (2012), arXiv:1111.6097 [hep-ph] .
  34. M. Cacciari, G. P. Salam, and G. Soyez, The Catchment Area of Jets, JHEP 04, 005, arXiv:0802.1188 [hep-ph] .
  35. B. B. Abelev et al. (ALICE), Charged jet cross sections and properties in proton-proton collisions at s=7𝑠7\sqrt{s}=7square-root start_ARG italic_s end_ARG = 7 TeV, Phys. Rev. D 91, 112012 (2015), arXiv:1411.4969 [nucl-ex] .
  36. S. Chatrchyan et al. (CMS), Measurement of Jet Fragmentation in PbPb and pp Collisions at sN⁢N=2.76subscript𝑠𝑁𝑁2.76\sqrt{s_{NN}}=2.76square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 2.76 TeV, Phys. Rev. C 90, 024908 (2014), arXiv:1406.0932 [nucl-ex] .
  37. M. Aaboud et al. (ATLAS), Measurement of jet fragmentation in Pb+Pb and p⁢p𝑝𝑝ppitalic_p italic_p collisions at sN⁢N=5.02subscript𝑠𝑁𝑁5.02\sqrt{s_{NN}}=5.02square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 5.02 TeV with the ATLAS detector, Phys. Rev. C 98, 024908 (2018), arXiv:1805.05424 [nucl-ex] .
  38. U. Acharya et al. (PHENIX), Measurement of jet-medium interactions via direct photon-hadron correlations in Au+++Au and d𝑑ditalic_d +++Au collisions at sN⁢N=200subscript𝑠𝑁𝑁200\sqrt{s_{{}_{NN}}}=200square-root start_ARG italic_s start_POSTSUBSCRIPT start_FLOATSUBSCRIPT italic_N italic_N end_FLOATSUBSCRIPT end_POSTSUBSCRIPT end_ARG = 200 GeV, Phys. Rev. C 102, 054910 (2020b), arXiv:2005.14270 [hep-ex] .
  39. A. Adare et al. (PHENIX), Transverse energy production and charged-particle multiplicity at midrapidity in various systems from sN⁢N=7.7subscript𝑠𝑁𝑁7.7\sqrt{s_{NN}}=7.7square-root start_ARG italic_s start_POSTSUBSCRIPT italic_N italic_N end_POSTSUBSCRIPT end_ARG = 7.7 to 200 GeV, Phys. Rev. C 93, 024901 (2016b), arXiv:1509.06727 [nucl-ex] .
  40. R. Tibshirani, Regression shrinkage and selection via the lasso, Journal of the Royal Statistical Society. Series B (Methodological) 58, 267 (1996).
  41. M. Cranmer, Pysr: Fast & parallelized symbolic regression in python/julia (2020).
  42. I. Guyon and A. Elisseeff, An introduction to variable and feature selection, J. Mach. Learn. Res. 3, 1157–1182 (2003).
  43. L. Yu and H. Liu, Feature selection for high-dimensional data: A fast correlation-based filter solution (2003) pp. 856–863.
  44. J. R. Vergara and P. A. Estévez, A review of feature selection methods based on mutual information, Neural Computing and Applications 24, 175 (2013).
  45. A. Kraskov, H. Stögbauer, and P. Grassberger, Estimating mutual information, Phys. Rev. E 69, 066138 (2004).
  46. K. Pearson, VII. Note on regression and inheritance in the case of two parents, Proceedings of the Royal Society of London 58, 240 (1895), publisher: Royal Society.
Citations (1)
View on Semantic Scholar

Summary

No one has generated a summary of this paper yet.

Sign Up to Summarize

Paper to Video (Beta)

No one has generated a video about this paper yet.

Sign Up to Generate All Videos Subscribe on YouTube

Whiteboard

No one has generated a whiteboard explanation for this paper yet.

Sign Up to Generate

Open Problems

We haven't generated a list of open problems mentioned in this paper yet.

Generate Now

Continue Learning

We haven't generated follow-up questions for this paper yet.

Generate Now

Collections

Sign up for free to add this paper to one or more collections.

Sign Up

Tweets

Sign up for free to view the 1 tweet with 0 likes about this paper.

Sign Up for Free