Abstract
We introduce a new jet shape — N-subjettiness — designed to identify boosted hadronically-decaying objects like electroweak bosons and top quarks. Combined with a jet invariant mass cut, N-subjettiness is an effective discriminating variable for tagging boosted objects and rejecting the background of QCD jets with large invariant mass. In efficiency studies of boosted W bosons and top quarks, we find tagging efficiencies of 30% are achievable with fake rates of 1%. We also consider the discovery potential for new heavy resonances that decay to pairs of boosted objects, and find significant improvements are possible using N-subjettiness. In this way, N-subjettiness combines the advantages of jet shapes with the discriminating power seen in previous jet substructure algorithms.
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 [SPIRES].
J.M. Butterworth, B.E. Cox and J.R. Forshaw, W W scattering at the CERN LHC, Phys. Rev. D 65 (2002) 096014 [hep-ph/0201098] [SPIRES].
J.M. Butterworth, A. Davison, E. Ozcan and P. Sherwood, Y splitter: An athena tool for studying jet substructure, ATL-PHYS-INT-2007-015.
G. Brooijmans, High pT Hadronic Top Quark Identification, Part 1: Jet Mass and Y Splitter., ATL-COM-PHYS-2008-001 (2008).
J. Thaler and L.-T. Wang, Strategies to Identify Boosted Tops, JHEP 07 (2008) 092 [arXiv:0806.0023] [SPIRES].
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] [SPIRES].
L.G. Almeida et al., Substructure of high-p T Jets at the LHC, Phys. Rev. D 79 (2009) 074017 [arXiv:0807.0234] [SPIRES].
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] [SPIRES].
J.M. Butterworth, A.R. Davison, M. Rubin and G.P. Salam, Jet substructure as a new Higgs search channel at the Large Hadron Collider, arXiv:0810.0409 [SPIRES].
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] [SPIRES].
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] [SPIRES].
D. Krohn, J. Thaler and L.-T. Wang, Jet Trimming, JHEP 02 (2010) 084 [arXiv:0912.1342] [SPIRES].
D.E. Soper and M. Spannowsky, Combining subjet algorithms to enhance ZH detection at the LHC, JHEP 08 (2010) 029 [arXiv:1005.0417] [SPIRES].
J.M. Butterworth, J.R. Ellis, A.R. Raklev and G.P. Salam, Discovering baryon-number violating neutralino decays at the LHC, Phys. Rev. Lett. 103 (2009) 241803 [arXiv:0906.0728] [SPIRES].
T. Plehn, G.P. Salam and M. Spannowsky, Fat Jets for a Light Higgs, Phys. Rev. Lett. 104 (2010) 111801 [arXiv:0910.5472] [SPIRES].
G.D. Kribs, A. Martin, T.S. Roy and M. Spannowsky, Discovering the Higgs Boson in New Physics Events using Jet Substructure, Phys. Rev. D 81 (2010) 111501 [arXiv:0912.4731] [SPIRES].
J. Gallicchio and M.D. Schwartz, Seeing in Color: Jet Superstructure, Phys. Rev. Lett. 105 (2010) 022001 [arXiv:1001.5027] [SPIRES].
C.-R. Chen, M.M. Nojiri and W. Sreethawong, Search for the Elusive Higgs Boson Using Jet Structure at LHC, JHEP 11 (2010) 012 [arXiv:1006.1151] [SPIRES].
A. Falkowski, D. Krohn, L.-T. Wang, J. Shelton and A. Thalapillil, Unburied Higgs, arXiv:1006.1650 [SPIRES].
G.D. Kribs, A. Martin, T.S. Roy and M. Spannowsky, Discovering Higgs Bosons of the MSSM using Jet Substructure, Phys. Rev. D 82 (2010) 095012 [arXiv:1006.1656] [SPIRES].
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] [SPIRES].
T. Plehn, M. Spannowsky, M. Takeuchi and D. Zerwas, Stop Reconstruction with Tagged Tops, JHEP 10 (2010) 078 [arXiv:1006.2833] [SPIRES].
B. Bhattacherjee, M. Guchait, S. Raychaudhuri and K. Sridhar, Boosted Top Quark Signals for Heavy Vector Boson Excitations in a Universal Extra Dimension Model, Phys. Rev. D 82 (2010) 055006 [arXiv:1006.3213] [SPIRES].
K. Rehermann and B. Tweedie, Efficient Identification of Boosted Semileptonic Top Quarks at the LHC, arXiv:1007.2221 [SPIRES].
C. Hackstein and M. Spannowsky, Boosting Higgs discovery - the forgotten channel, Phys. Rev. D 82 (2010) 113012 [arXiv:1008.2202] [SPIRES].
C. Englert, C. Hackstein and M. Spannowsky, Measuring spin and CP from semi-hadronic ZZ decays using jet substructure, Phys. Rev. D 82 (2010) 114024 [arXiv:1010.0676] [SPIRES].
A. Katz, M. Son and B. Tweedie, Jet Substructure and the Search for Neutral Spin-One Resonances in Electroweak Boson Channels, arXiv:1010.5253 [SPIRES].
I.W. Stewart, F.J. Tackmann and W.J. Waalewijn, N-Jettiness: An Inclusive Event Shape to Veto Jets, Phys. Rev. Lett. 105 (2010) 092002 [arXiv:1004.2489] [SPIRES].
S.D. Ellis, C.K. Vermilion, J.R. Walsh, A. Hornig and C. Lee, Jet Shapes and Jet Algorithms in SCET, JHEP 11 (2010) 101 [arXiv:1001.0014] [SPIRES].
A. Banfi, M. Dasgupta, K. Khelifa-Kerfa and S. Marzani, Non-global logarithms and jet algorithms in high-pT jet shapes, JHEP 08 (2010) 064 [arXiv:1004.3483] [SPIRES].
M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [SPIRES].
E. Farhi, A QCD Test for Jets, Phys. Rev. Lett. 39 (1977) 1587 [SPIRES].
S. Catani, Y.L. Dokshitzer, M.H. Seymour and B.R. Webber, Longitudinally invariant K t clustering algorithms for hadron hadron collisions, Nucl. Phys. B 406 (1993) 187 [SPIRES].
S.D. Ellis and D.E. Soper, Successive combination jet algorithm for hadron collisions, Phys. Rev. D 48 (1993) 3160 [hep-ph/9305266] [SPIRES].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP 05 (2006) 026 [hep-ph/0603175] [SPIRES].
T. Sjöstrand, S. Mrenna and P.Z. Skands, A Brief Introduction to PYTHIA 8.1, Comput. Phys. Commun. 178 (2008) 852 [arXiv:0710.3820] [SPIRES].
M. Cacciari, G.P. Salam and G. Soyez, FastJet, http://fastjet.fr/.
M. Cacciari and G.P. Salam, Dispelling the N 3 myth for the k t jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [SPIRES].
J. Alwall et al., Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions, Eur. Phys. J. C 53 (2008) 473 [arXiv:0706.2569] [SPIRES].
Y.L. Dokshitzer, G.D. Leder, S. Moretti and B.R. Webber, Better Jet Clustering Algorithms, JHEP 08 (1997) 001 [hep-ph/9707323] [SPIRES].
M. Wobisch and T. Wengler, Hadronization corrections to jet cross sections in deep-inelastic scattering, hep-ph/9907280 [SPIRES].
G. Altarelli, B. Mele and M. Ruiz-Altaba, SEARCHING for new heavy vector bosons in \( p\bar{p} \) colliders, Z. Phys. C 45 (1989) 109 [SPIRES].
J.-H. Kim, Rest Frame Subjet Algorithm With SISCone Jet For Fully Hadronic Decaying Higgs Search, Phys. Rev. D 83 (2011) 011502(R) [arXiv:1011.1493] [SPIRES].
C.F. Berger, T. Kucs and G.F. Sterman, Event shape/energy flow correlations, Phys. Rev. D 68 (2003) 014012 [hep-ph/0303051] [SPIRES].
S. Catani, G. Turnock and B.R. Webber, Jet broadening measures in e + e − annihilation, Phys. Lett. B 295 (1992) 269 [SPIRES].
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1011.2268
Rights and permissions
About this article
Cite this article
Thaler, J., Van Tilburg, K. Identifying boosted objects with N-subjettiness. J. High Energ. Phys. 2011, 15 (2011). https://doi.org/10.1007/JHEP03(2011)015
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP03(2011)015