Abstract
We carry out simple analytical calculations and Monte Carlo studies to better understand the impact of QCD radiation on some well-known jet substructure methods for jets arising from the decay of boosted Higgs bosons. Understanding differences between taggers for these signal jets assumes particular significance in situations where they perform similarly on QCD background jets. As an explicit example of this we compare the Y-splitter method to the more recently proposed Y-pruning technique. We demonstrate how the insight we gain can be used to significantly improve the performance of Y-splitter by combining it with trimming and show that this combination outperforms the other taggers studied here, at high p T . We also make analytical estimates for optimal parameter values, for a range of methods and compare to results from Monte Carlo studies.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
M.H. Seymour, Searches for new particles using cone and cluster jet algorithms: a comparative study, Z. Phys. C 62 (1994) 127 [INSPIRE].
J.M. Butterworth, B.E. Cox and J.R. Forshaw, WW scattering at the CERN LHC, Phys. Rev. D 65 (2002) 096014 [hep-ph/0201098] [INSPIRE].
J.M. Butterworth, A.R. Davison, M. Rubin and G.P. Salam, Jet substructure as a new Higgs search channel at the LHC, Phys. Rev. Lett. 100 (2008) 242001 [arXiv:0802.2470] [INSPIRE].
ATLAS collaboration, Jet mass and substructure of inclusive jets in \( \sqrt{s}=7 \) TeV pp collisions with the ATLAS experiment, JHEP 05 (2012) 128 [arXiv:1203.4606] [INSPIRE].
ATLAS collaboration, ATLAS measurements of the properties of jets for boosted particle searches, Phys. Rev. D 86 (2012) 072006 [arXiv:1206.5369] [INSPIRE].
ATLAS collaboration, Performance of jet substructure techniques for large-R jets in proton-proton collisions at \( \sqrt{s}=7 \) TeV using the ATLAS detector, JHEP 09 (2013) 076 [arXiv:1306.4945] [INSPIRE].
CMS collaboration, Studies of jet mass in dijet and W/Z + jet events, JHEP 05 (2013) 090 [arXiv:1303.4811] [INSPIRE].
ATLAS collaboration, Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at \( \sqrt{s}=7 \) TeV, JHEP 01 (2013) 116 [arXiv:1211.2202] [INSPIRE].
ATLAS collaboration, A search for \( t\overline{t} \) resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, JHEP 09 (2012) 041 [arXiv:1207.2409] [INSPIRE].
ATLAS collaboration, Search for pair production of massive particles decaying into three quarks with the ATLAS detector in √ s = 7 TeV pp collisions at the LHC, JHEP 12 (2012) 086 [arXiv:1210.4813] [INSPIRE].
ATLAS collaboration, Search for pair-produced massive coloured scalars in four-jet final states with the ATLAS detector in proton-proton collisions at \( \sqrt{s}=7 \) TeV, Eur. Phys. J. C 73 (2013)2263 [arXiv:1210.4826] [INSPIRE].
CMS collaboration, Search for anomalous \( t\overline{t} \) production in the highly-boosted all-hadronic final state, JHEP 09 (2012) 029 [Erratum ibid. 03 (2014) 132] [arXiv:1204.2488] [INSPIRE].
CMS collaboration, Search for resonant \( t\overline{t} \) production in lepton+jets events in pp collisions at \( \sqrt{s}=7 \) TeV, JHEP 12 (2012) 015 [arXiv:1209.4397] [INSPIRE].
CMS collaboration, Search for heavy resonances in the W/Z-tagged dijet mass spectrum in pp collisions at 7 TeV, Phys. Lett. B 723 (2013) 280 [arXiv:1212.1910] [INSPIRE].
G. Brooijmans, High p T hadronic top quark identification, ATL-PHYS-CONF-2008-008, CERN, Geneva Switzerland (2008).
CMS collaboration, Search for high mass tt resonances in the all-hadronic mode, CMS-PAS-EXO-09-002, CERN, Geneva Switzerland (2009).
D.E. Kaplan, K. Rehermann, M.D. Schwartz and B. Tweedie, Top tagging: a method for identifying boosted hadronically decaying top quarks, Phys. Rev. Lett. 101 (2008) 142001 [arXiv:0806.0848] [INSPIRE].
T. Plehn, M. Spannowsky, M. Takeuchi and D. Zerwas, Stop reconstruction with tagged tops, JHEP 10 (2010) 078 [arXiv:1006.2833] [INSPIRE].
S.D. Ellis, C.K. Vermilion and J.R. Walsh, Techniques for improved heavy particle searches with jet substructure, Phys. Rev. D 80 (2009) 051501 [arXiv:0903.5081] [INSPIRE].
S.D. Ellis, C.K. Vermilion and J.R. Walsh, Recombination algorithms and jet substructure: pruning as a tool for heavy particle searches, Phys. Rev. D 81 (2010) 094023 [arXiv:0912.0033] [INSPIRE].
D. Krohn, J. Thaler and L.-T. Wang, Jet trimming, JHEP 02 (2010) 084 [arXiv:0912.1342] [INSPIRE].
L.G. Almeida, S.J. Lee, G. Perez, G. Sterman and I. Sung, Template overlap method for massive jets, Phys. Rev. D 82 (2010) 054034 [arXiv:1006.2035] [INSPIRE].
L.G. Almeida, O. Erdogan, J. Juknevich, S.J. Lee, G. Perez and G. Sterman, Three-particle templates for a boosted Higgs boson, Phys. Rev. D 85 (2012) 114046 [arXiv:1112.1957] [INSPIRE].
S.D. Ellis, A. Hornig, T.S. Roy, D. Krohn and M.D. Schwartz, Qjets: a non-deterministic approach to tree-based jet substructure, Phys. Rev. Lett. 108 (2012) 182003 [arXiv:1201.1914] [INSPIRE].
D.E. Soper and M. Spannowsky, Finding physics signals with shower deconstruction, Phys. Rev. D 84 (2011) 074002 [arXiv:1102.3480] [INSPIRE].
A. Abdesselam et al., Boosted objects: a probe of beyond the standard model physics, Eur. Phys. J. C 71 (2011) 1661 [arXiv:1012.5412] [INSPIRE].
A. Altheimer et al., Jet substructure at the Tevatron and LHC: new results, new tools, new benchmarks, J. Phys. G 39 (2012) 063001 [arXiv:1201.0008] [INSPIRE].
A. Altheimer et al., Boosted objects and jet substructure at the LHC. Report of BOOST2012, held at IFIC Valencia, 23rd –27th of July 2012, Eur. Phys. J. C 74 (2014) 2792 [arXiv:1311.2708] [INSPIRE].
G.P. Salam, Towards jetography, Eur. Phys. J. C 67 (2010) 637 [arXiv:0906.1833] [INSPIRE].
A.J. Larkoski, G.P. Salam and J. Thaler, Energy correlation functions for jet substructure, JHEP 06 (2013) 108 [arXiv:1305.0007] [INSPIRE].
M. Dasgupta, A. Fregoso, S. Marzani and G.P. Salam, Towards an understanding of jet substructure, JHEP 09 (2013) 029 [arXiv:1307.0007] [INSPIRE].
M. Dasgupta, A. Fregoso, S. Marzani and A. Powling, Jet substructure with analytical methods, Eur. Phys. J. C 73 (2013) 2623 [arXiv:1307.0013] [INSPIRE].
A.J. Larkoski, S. Marzani, G. Soyez and J. Thaler, Soft drop, JHEP 05 (2014) 146 [arXiv:1402.2657] [INSPIRE].
M. Rubin, Non-global logarithms in filtered jet algorithms, JHEP 05 (2010) 005 [arXiv:1002.4557] [INSPIRE].
I. Feige, M.D. Schwartz, I.W. Stewart and J. Thaler, Precision jet substructure from boosted event shapes, Phys. Rev. Lett. 109 (2012) 092001 [arXiv:1204.3898] [INSPIRE].
A. Banfi and J. Cancino, Implications of QCD radiative corrections on high-p T Higgs searches, Phys. Lett. B 718 (2012) 499 [arXiv:1207.0674] [INSPIRE].
A.J. Larkoski, I. Moult and D. Neill, Building a better boosted top tagger, Phys. Rev. D 91 (2015) 034035 [arXiv:1411.0665] [INSPIRE].
M. Dasgupta, K. Khelifa-Kerfa, S. Marzani and M. Spannowsky, On jet mass distributions in Z+jet and dijet processes at the LHC, JHEP 10 (2012) 126 [arXiv:1207.1640] [INSPIRE].
J.R. Forshaw, A. Kyrieleis and M.H. Seymour, Super-leading logarithms in non-global observables in QCD, JHEP 08 (2006) 059 [hep-ph/0604094] [INSPIRE].
M. Dasgupta and G.P. Salam, Resummation of nonglobal QCD observables, Phys. Lett. B 512 (2001) 323 [hep-ph/0104277] [INSPIRE].
R.B. Appleby and M.H. Seymour, Nonglobal logarithms in interjet energy flow with k t clustering requirement, JHEP 12 (2002) 063 [hep-ph/0211426] [INSPIRE].
A. Banfi and M. Dasgupta, Problems in resumming interjet energy flows with k t clustering, Phys. Lett. B 628 (2005) 49 [hep-ph/0508159] [INSPIRE].
Y. Delenda, R. Appleby, M. Dasgupta and A. Banfi, On QCD resummation with k t clustering, JHEP 12 (2006) 044 [hep-ph/0610242] [INSPIRE].
M. Bahr et al., HERWIG++ physics and manual, Eur. Phys. J. C 58 (2008) 639 [arXiv:0803.0883] [INSPIRE].
J. Bellm et al., HERWIG++ 2.7 release note, arXiv:1310.6877 [INSPIRE].
M.H. Seymour and A. Siodmok, Constraining MPI models using σ eff and recent Tevatron and LHC underlying event data, JHEP 10 (2013) 113 [arXiv:1307.5015] [INSPIRE].
A. Buckley et al., Rivet user manual, Comput. Phys. Commun. 184 (2013) 2803 [arXiv:1003.0694] [INSPIRE].
Y.L. Dokshitzer, G.D. Leder, S. Moretti and B.R. Webber, Better jet clustering algorithms, JHEP 08 (1997) 001 [hep-ph/9707323] [INSPIRE].
M. Wobisch and T. Wengler, Hadronization corrections to jet cross-sections in deep inelastic scattering, in Monte Carlo generators for HERA physics, Hamburg Germany (1999), pg. 270 [hep-ph/9907280] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet user manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
S. Gieseke, C. Rohr and A. Siodmok, Colour reconnections in HERWIG++, Eur. Phys. J. C 72 (2012) 2225 [arXiv:1206.0041] [INSPIRE].
M. Bahr, M. Myska, M.H. Seymour and A. Siodmok, Extracting σ effective from the CDF γ + 3 jets measurement, JHEP 03 (2013) 129 [arXiv:1302.4325] [INSPIRE].
CDF, D0 collaboration, T. Aaltonen, A. Buzatu, B. Kilminster, Y. Nagai and W. Yao, Improved b-jet energy correction for \( H\to b\overline{b} \) searches at CDF, arXiv:1107.3026 [INSPIRE].
M. Dasgupta, L. Magnea and G.P. Salam, Non-perturbative QCD effects in jets at hadron colliders, JHEP 02 (2008) 055 [arXiv:0712.3014] [INSPIRE].
G. Soyez, G.P. Salam, J. Kim, S. Dutta and M. Cacciari, Pileup subtraction for jet shapes, Phys. Rev. Lett. 110 (2013) 162001 [arXiv:1211.2811] [INSPIRE].
D. Krohn, M.D. Schwartz, M. Low and L.-T. Wang, Jet cleansing: pileup removal at high luminosity, Phys. Rev. D 90 (2014) 065020 [arXiv:1309.4777] [INSPIRE].
M. Cacciari and G.P. Salam, Pileup subtraction using jet areas, Phys. Lett. B 659 (2008) 119 [arXiv:0707.1378] [INSPIRE].
P. Richardson and D. Winn, Investigation of Monte Carlo uncertainties on Higgs boson searches using jet substructure, Eur. Phys. J. C 72 (2012) 2178 [arXiv:1207.0380] [INSPIRE].
A. Buckley et al., General-purpose event generators for LHC physics, Phys. Rept. 504 (2011) 145 [arXiv:1101.2599] [INSPIRE].
S.D. Ellis and D.E. Soper, Successive combination jet algorithm for hadron collisions, Phys. Rev. D 48 (1993) 3160 [hep-ph/9305266] [INSPIRE].
J. Thaler and L.-T. Wang, Strategies to identify boosted tops, JHEP 07 (2008) 092 [arXiv:0806.0023] [INSPIRE].
J. Thaler and K. Van Tilburg, Identifying boosted objects with N -subjettiness, JHEP 03 (2011) 015 [arXiv:1011.2268] [INSPIRE].
M. Dasgupta, A. Powling and A. Siodmok, work in progress.
D.E. Soper and M. Spannowsky, Combining subjet algorithms to enhance ZH detection at the LHC, JHEP 08 (2010) 029 [arXiv:1005.0417] [INSPIRE].
G. Soyez, Theory lessons from LHC Run I, talk delivered at BOOST 2014, http://www.hep.ucl.ac.uk/boost2014, University College London, London U.K. August 18–22 2014.
S. Catani and M.H. Seymour, The dipole formalism for the calculation of QCD jet cross-sections at next-to-leading order, Phys. Lett. B 378 (1996) 287 [hep-ph/9602277] [INSPIRE].
T. Gleisberg et al., Event generation with SHERPA 1.1, JHEP 02 (2009) 007 [arXiv:0811.4622] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Studying the underlying event in Drell-Yan and high transverse momentum jet production at the Tevatron, Phys. Rev. D 82 (2010) 034001 [arXiv:1003.3146] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1503.01088
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Dasgupta, M., Powling, A. & Siodmok, A. On jet substructure methods for signal jets. J. High Energ. Phys. 2015, 79 (2015). https://doi.org/10.1007/JHEP08(2015)079
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP08(2015)079