Measurements of jet charge with dijet events in pp collisions at sqrt(s) = 8 TeV

Jet charge is an estimator of the electric charge of a quark, antiquark, or gluon initiating a jet. It is based on the momentum-weighted sum of the electric charges of the jet constituents. Measurements of three charge observables of the leading jet in transverse momentum pT are performed with dijet events. The analysis is carried out with data collected by the CMS experiment at the CERN LHC in proton-proton collisions at √ s = 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. The results are presented as a function of the pT of the leading jet and compared to predictions from leadingand next-to-leading-order event generators combined with parton showers. Measured jet charge distributions, unfolded for detector effects, are reported, which expand on previous measurements of the jet charge average and standard deviation in pp collisions. Published in the Journal of High Energy Physics as doi:10.1007/JHEP10(2017)131. c © 2017 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license ∗See Appendix A for the list of collaboration members ar X iv :1 70 6. 05 86 8v 2 [ he pex ] 2 3 O ct 2 01 7

[1]  C. Collaboration,et al.  Particle-flow reconstruction and global event description with the CMS detector , 2017, 1706.04965.

[2]  Alberto Guffanti,et al.  Unbiased global determination of parton distributions and their uncertainties at NNLO and at LO , 2011, 1107.2652.

[3]  J. Huston,et al.  New parton distributions for collider physics , 2010, 1007.2241.

[4]  E. al.,et al.  Measurement of trilinear gauge boson couplings WWV (V=Z,gamma) in e+e- collisions at 189 GeV , 1999, hep-ex/0102041.

[5]  P. Nason,et al.  Matching NLO QCD computations with Parton Shower simulations: the POWHEG method , 2007, 0709.2092.

[6]  V. M. Ghete,et al.  Determination of jet energy calibration and transverse momentum resolution in CMS , 2011 .

[7]  R. Erickson,et al.  Charge retention in deep-inelastic electroproduction , 1979 .

[8]  Richard J. K. Taylor,et al.  Measurement of triple gauge boson couplings from W+W- production at LEP energies up to 189 GeV , 2001 .

[9]  Simone Alioli,et al.  Jet pair production in POWHEG , 2010, 1012.3380.

[10]  T. Tuuva,et al.  Identification techniques for highly boosted W bosons that decay into hadrons , 2014 .

[11]  A. G. Frodesen,et al.  A measurement of sin2θw from the charge asymmetry of hadronic events at the Z0 peak , 1992 .

[12]  E. Re,et al.  A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX , 2010, 1002.2581.

[13]  M. D. Pietra,et al.  Measurement of jet charge in dijet events from √s = 8 TeV p p collisions with the ATLAS detector , 2016 .

[14]  William H. Richardson,et al.  Bayesian-Based Iterative Method of Image Restoration , 1972 .

[15]  W. Waalewijn.  Calculating the charge of a jet , 2012, 1209.3019.

[16]  M. Dorigo,et al.  Exclusion of exotic top-like quarks with -4/3 electric charge using jet-charge tagging in single-lepton tt̄ events at CDF , 2013, 1304.4141.

[17]  J. Huston,et al.  New generation of parton distributions with uncertainties from global QCD analysis , 2002, hep-ph/0201195.

[18]  Tim Adye,et al.  Unfolding algorithms and tests using RooUnfold , 2011, 1105.1160.

[19]  B. Webber.  A QCD model for jet fragmentation including soft gluon interference , 1984 .

[20]  V. M. Ghete,et al.  Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV , 2015 .

[21]  P. G. Verdini,et al.  Measurement of triple gauge boson couplings at 172-GeV , 1998 .

[22]  L. Lucy.  An iterative technique for the rectification of observed distributions , 1974 .

[23]  T. Sjöstrand.  The merging of jets , 1984 .

[24]  M. Cacciari,et al.  FastJet user manual , 2011, 1111.6097.

[25]  João Paulo Teixeira,et al.  The CMS experiment at the CERN LHC , 2008 .

[26]  Burke,et al.  Measurement of the parity-violation parameter Ab from the left-right forward-backward asymmetry of b quark production in Z0 decays using a momentum-weighted track-charge technique. , 1995, Physical review letters.

[27]  A. Hoecker,et al.  SVD APPROACH TO DATA UNFOLDING , 1995, hep-ph/9509307.

[28]  Richard D Field,et al.  A Parametrization of the Properties of Quark Jets , 1978 .

[29]  New formalism for QCD parton showers , 2003, hep-ph/0310083.

[30]  M. Gigg,et al.  Herwig++ physics and manual , 2008, 0803.0883.

[31]  P. Nason.  A new method for combining NLO QCD with shower Monte Carlo algorithms , 2004, hep-ph/0409146.

[32]  G. E. Richards,et al.  Measurement of the time dependence of B0d↔B0d mixing using a jet charge technique , 1994 .

[33]  M. Cacciari,et al.  A pr 2 00 8 The anti-k t jet clustering algorithm , 2008 .

[34]  M. Schwartz,et al.  Jet charge at the LHC. , 2012, Physical review letters.

[35]  V. M. Ghete,et al.  Event generator tunes obtained from underlying event and multiparton scattering measurements , 2015, 1512.00815.

[36]  S. Forte,et al.  Parton distributions with QED corrections The NNPDF Collaboration : , 2013 .

[37]  R. Field,et al.  Min-Bias and the Underlying Event at the LHC , 2011, 1202.0901.

[38]  T. Sjöstrand,et al.  Parton fragmentation and string dynamics , 1983 .

[39]  P. G. Verdini,et al.  Measurement of charge asymmetry in hadronic Z decays , 1991 .

[40]  G. D'Agostini,et al.  A Multidimensional unfolding method based on Bayes' theorem , 1995 .

[41]  C. Collaboration,et al.  Description and performance of track and primary-vertex reconstruction with the CMS tracker , 2014, 1405.6569.