Abstract
Having pure samples of quark and gluon jets would greatly facilitate the study of jet properties and substructure, with many potential standard model and new physics applications. To this end, we consider multijet and jets + X samples, to determine the purity that can be achieved by simple kinematic cuts leaving reasonable production cross sections. We find, for example, that at the 7TeV LHC, the pp → γ+2jets sample can provide 98% pure quarkjets with 200 GeV of transverse momentum and a cross section of 5 pb. Toget 10 pb of 200 GeV jets with 90% gluon purity, the pp → 3jets sample can be used. b+2jets is also useful for gluons, but only if the b-tagging is very efficient.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
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 [ar**v:0806.0848] [ inSPIRE].
T. Han, D. Krohn, L.-T. Wang and W. Zhu, New Physics Signals in Longitudinal Gauge Boson Scattering at the LHC, JHEP 03 (2010) 082 [ar**v:0911.3656] [ inSPIRE].
J. Thaler and K. Van Tilburg, Identifying Boosted Objects with N-subjettiness, JHEP 03 (2011) 015 [ar**v:1011.2268] [ inSPIRE].
J. Gallicchio, J. Huth, M. Kagan, M.D. Schwartz, K. Black, et al., Multivariate discrimination and the Higgs + W/Z search, JHEP 04 (2011) 069 [ar**v:1010.3698] [ inSPIRE].
Y. Cui, Z. Han and M.D. Schwartz, W-jet Tagging: Optimizing the Identification of Boosted Hadronically-Decaying W Bosons, Phys. Rev. D 83 (2011) 074023 [ar**v:1012.2077] [ inSPIRE].
A. Abdesselam, E. Kuutmann, U. Bitenc, G. Brooijmans, J. Butterworth, et al., Boosted objects: A Probe of beyond the Standard Model physics, Eur. Phys. J. C 71 (2011) 1661 [ar**v:1012.5412] [ 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 [ar**v:0802.2470] [ inSPIRE].
D. Krohn, J. Shelton and L.-T. Wang, Measuring the Polarization of Boosted Hadronic Tops, JHEP 07 (2010) 041 [ar**v:0909.3855] [ inSPIRE].
A. Banfi, G.P. Salam and G. Zanderighi, Infrared safe definition of jet flavor, Eur. Phys. J. C 47 (2006) 113 [hep-ph/0601139] [ inSPIRE].
J. Gallicchio and M.D. Schwartz, Seeing in Color: Jet Superstructure, Phys. Rev. Lett. 105 (2010) 022001 [ar**v:1001.5027] [ inSPIRE].
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 [ar**v:1001.0014] [ inSPIRE].
R. Kelley, M.D. Schwartz and H.X. Zhu, Resummation of jet mass with and without a jet veto, ar**v:1102.0561 [ inSPIRE].
J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, et al., MadGraph/MadEvent v4: The New Web Generation, JHEP 09 (2007) 028 [ar**v:0706.2334] [ inSPIRE].
D. Stump, J. Huston, J. Pumplin, W.-K. Tung, H. Lai, et al., Inclusive jet production, parton distributions and the search for new physics, JHEP 10 (2003) 046 [hep-ph/0303013] [ inSPIRE].
A. Hoecker et al., TMVA Toolkit for Multivariate Data Analysis with ROOT, http://tmva.sourceforge.net/.
R. Brun and F. Rademakers, ROOT: An object oriented data analysis framework, Nucl. Instrum. Meth. A 389 (1997) 81 [ inSPIRE].
OPAL collaboration, O. Biebel, A comparison of b and uds quarks to gluon jets, SPIRES Conference C96/08/11.1 (1996) [ inSPIRE].
M. Dasgupta and G. Salam, Resummation of nonglobal QCD observables, Phys. Lett. B 512 (2001) 323 [hep-ph/0104277] [ inSPIRE].
R. Kelley, M.D. Schwartz, R.M. Schabinger and H.X. Zhu, The two-loop hemisphere soft function, Phys. Rev. D 84 (2011) 045022 [ar**v:1105.3676] [ inSPIRE].
A. Hornig, C. Lee, I.W. Stewart, J.R. Walsh and S. Zuberi, Non-global Structure of the \( O\left( {\alpha_s^2} \right) \) Dijet Soft Function, JHEP 08 (2011) 054 [ar**v:1105.4628] [ inSPIRE].
C.W. Bauer, S. Fleming, D. Pirjol and I.W. Stewart, An Effective field theory for collinear and soft gluons: Heavy to light decays, Phys. Rev. D 63 (2001) 114020 [hep-ph/0011336] [ inSPIRE].
C.W. Bauer, D. Pirjol and I.W. Stewart, Soft collinear factorization in effective field theory, Phys. Rev. D 65 (2002) 054022 [hep-ph/0109045] [ inSPIRE].
T. Becher and M.D. Schwartz, Direct photon production with effective field theory, JHEP 02 (2010) 040 [ar**v:0911.0681] [ inSPIRE].
J. Gallicchio and M.D. Schwartz, Quark and Gluon Tagging at the LHC, ar**v:1106.3076 [ inSPIRE].
Author information
Authors and Affiliations
Corresponding author
Additional information
Ar**v ePrint: 1104.1175
Rights and permissions
About this article
Cite this article
Gallicchio, J., Schwartz, M.D. Pure samples of quark and gluon jets at the LHC. J. High Energ. Phys. 2011, 103 (2011). https://doi.org/10.1007/JHEP10(2011)103
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP10(2011)103