Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV

Khachatryan, Vardan

doi:10.1007/JHEP01(2015)053

Title: Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $$ \sqrt{s}=8 $$ TeV

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP01(2015)053· OSTI ID:1234852

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI) (Armenia). et al.

We presented a measurement of the W boson helicity, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. We also found that the data sample corresponds to an integrated luminosity of 19.7 fb^-1. The measured helicity fractions are F_L = 0.298 ± 0.028 (stat) ± 0.032(syst), F ₀ = 0.720 ± 0.039 (stat) ± 0.037(syst), and F_R= -0.018 ± 0.019 (stat) ± 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g _L and g _R.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CMS Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1234852

Report Number(s):: FERMILAB-PUB-14-446-CMS; CERN-PH-EP-2014-242; CMS-TOP-12-020; arXiv eprint number arXiv:1410.1154; TRN: US1500489

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 1; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 27 works

Citation information provided by
Web of Science

References (25)

Observation of the Top Quark Abachi, S.; Abbott, B.; Abolins, M. Physical Review Letters, Vol. 74, Issue 14 https://doi.org/10.1103/PhysRevLett.74.2632	journal	April 1995
W polarisation beyond helicity fractions in top quark decays Aguilar-Saavedra, J. A.; Bernabéu, J. Nuclear Physics B, Vol. 840, Issue 1-2 https://doi.org/10.1016/j.nuclphysb.2010.07.012	journal	November 2010
The anti- k _t jet clustering algorithm Cacciari, Matteo; Salam, Gavin P.; Soyez, Gregory Journal of High Energy Physics, Vol. 2008, Issue 04 https://doi.org/10.1088/1126-6708/2008/04/063	journal	April 2008
Method for simulating electroweak top-quark production events in the NLO approximation: SingleTop event generator Boos, E. E.; Bunichev, V. E.; Dudko, L. V. Physics of Atomic Nuclei, Vol. 69, Issue 8 https://doi.org/10.1134/S1063778806080084	journal	August 2006
MadGraph 5: going beyond Alwall, Johan; Herquet, Michel; Maltoni, Fabio Journal of High Energy Physics, Vol. 2011, Issue 6 https://doi.org/10.1007/JHEP06(2011)128	journal	June 2011
A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms Nason, Paolo Journal of High Energy Physics, Vol. 2004, Issue 11 https://doi.org/10.1088/1126-6708/2004/11/040	journal	November 2004
A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX Alioli, Simone; Nason, Paolo; Oleari, Carlo Journal of High Energy Physics, Vol. 2010, Issue 6 https://doi.org/10.1007/JHEP06(2010)043	journal	June 2010
PYTHIA 6.4 physics and manual Sjöstrand, Torbjörn; Mrenna, Stephen; Skands, Peter Journal of High Energy Physics, Vol. 2006, Issue 05 https://doi.org/10.1088/1126-6708/2006/05/026	journal	May 2006
Observation of Electroweak Single Top-Quark Production Aaltonen, T.; Adelman, J.; Akimoto, T. Physical Review Letters, Vol. 103, Issue 9 https://doi.org/10.1103/PhysRevLett.103.092002	journal	August 2009
Observation of Single Top-Quark Production Abazov, V. M.; Abbott, B.; Abolins, M. Physical Review Letters, Vol. 103, Issue 9 https://doi.org/10.1103/PhysRevLett.103.092001	journal	August 2009
Minuit - a system for function minimization and analysis of the parameter errors and correlations James, F.; Roos, M. Computer Physics Communications, Vol. 10, Issue 6 https://doi.org/10.1016/0010-4655(75)90039-9	journal	December 1975
CompHEP 4.4—automatic computations from Lagrangians to events Boos, E.; Bunichev, V.; Dubinin, M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 534, Issue 1-2 https://doi.org/10.1016/j.nima.2004.07.096	journal	November 2004
Probing anomalous Wtb couplings in top pair decays Aguilar-Saavedra, J. A.; Carvalho, J.; Castro, N. The European Physical Journal C, Vol. 50, Issue 3 https://doi.org/10.1140/epjc/s10052-007-0289-4	journal	April 2007
Observation of Top Quark Production in $\bar{p} p$ Collisions with the Collider Detector at Fermilab Abe, F.; Akimoto, H.; Akopian, A. Physical Review Letters, Vol. 74, Issue 14 https://doi.org/10.1103/PhysRevLett.74.2626	journal	April 1995
Geant4—a simulation toolkit Agostinelli, S.; Allison, J.; Amako, K. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8	journal	July 2003
Observation of the Associated Production of a Single Top Quark and a $W$ Boson in $p p$ Collisions at $\sqrt{s} = 8 TeV$ Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M. Physical Review Letters, Vol. 112, Issue 23 https://doi.org/10.1103/PhysRevLett.112.231802	journal	June 2014
Matching NLO QCD computations with parton shower simulations: the POWHEG method Frixione, Stefano; Nason, Paolo; Oleari, Carlo Journal of High Energy Physics, Vol. 2007, Issue 11 https://doi.org/10.1088/1126-6708/2007/11/070	journal	November 2007
Combination of searches for anomalous top quark couplings with <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mn>5.4</mml:mn><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mtext>fb</mml:mtext></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:math> of <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> collisions Abazov, V. M.; Abbott, B.; Acharya, B. S. Physics Letters B, Vol. 713, Issue 3 https://doi.org/10.1016/j.physletb.2012.05.048	journal	July 2012
Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through $O (α_{S}^{4})$ Czakon, Michał; Fiedler, Paul; Mitov, Alexander Physical Review Letters, Vol. 110, Issue 25 https://doi.org/10.1103/PhysRevLett.110.252004	journal	June 2013
LHC Machine Evans, Lyndon; Bryant, Philip Journal of Instrumentation, Vol. 3, Issue 08 https://doi.org/10.1088/1748-0221/3/08/S08001	journal	August 2008
Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV collaboration, The CMS Journal of Instrumentation, Vol. 7, Issue 10 https://doi.org/10.1088/1748-0221/7/10/P10002	journal	October 2012
Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV Collaboration, Cms Journal of Instrumentation, Vol. 8, Issue 09, p. P09009-P09009 https://doi.org/10.1088/1748-0221/8/09/P09009	journal	September 2013
Single-top Wt-channel production matched with parton showers using the POWHEG method Re, Emanuele The European Physical Journal C, Vol. 71, Issue 2 https://doi.org/10.1140/epjc/s10052-011-1547-z	journal	February 2011
Determination of jet energy calibration and transverse momentum resolution in CMS collaboration, The CMS Journal of Instrumentation, Vol. 6, Issue 11 https://doi.org/10.1088/1748-0221/6/11/P11002	journal	November 2011
Identification of b-quark jets with the CMS experiment collaboration, The CMS Journal of Instrumentation, Vol. 8, Issue 04 https://doi.org/10.1088/1748-0221/8/04/P04013	journal	April 2013

Cited By (6)

Top-quark physics at the Large Hadron Collider Cristinziani, Markus; Mulders, Martijn Journal of Physics G: Nuclear and Particle Physics, Vol. 44, Issue 6 https://doi.org/10.1088/1361-6471/44/6/063001	journal	May 2017
$T$ -odd correlations in polarized top quark decays in the sequential decay $t (↑) \to X_{b} + W^{+} (\to ℓ^{+} + ν_{ℓ})$ and in the quasi-three-body decay $t (↑) \to X_{b} + ℓ^{+} + ν_{ℓ}$ Fischer, M.; Groote, S.; Körner, J. G. Physical Review D, Vol. 97, Issue 9 https://doi.org/10.1103/physrevd.97.093001	journal	May 2018
Probing anomalous $W t b$ couplings at the LHC in single $t$ -channel top quark production Jueid, Adil Physical Review D, Vol. 98, Issue 5 https://doi.org/10.1103/physrevd.98.053006	journal	September 2018
Pinning down electroweak dipole operators of the top quark Schulze, Markus; Soreq, Yotam The European Physical Journal C, Vol. 76, Issue 8 https://doi.org/10.1140/epjc/s10052-016-4263-x	journal	August 2016
Search for new physics in top quark production in dilepton final states in proton-proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$s=13TeV Sirunyan, A. M.; Tumasyan, A.; Adam, W. The European Physical Journal C, Vol. 79, Issue 11 https://doi.org/10.1140/epjc/s10052-019-7387-y	journal	November 2019
Alternatives to an Elementary Higgs Csaki, Csaba; Grojean, Christophe; Terning, John Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2017-00308	text	January 2016

Linked Research (4)

Similar Records

Measurement of the W boson helicity in top quark decays using 5.4 fb{sup -1} of pp collision data

Journal Article · Tue Feb 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields · OSTI ID:1234852

Abazov, V M; Alexeev, G D; Golovanov, G; +17 more

Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at

\sqrt{s} = 8 TeV

Journal Article · Tue Nov 01 00:00:00 EDT 2016 · Physics Letters B · OSTI ID:1234852

Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; +2255 more

Measurement of the W boson helicity in top quark decays using 5.4 fb⁻¹ of pp̄ collision data

Journal Article · Fri Feb 18 00:00:00 EST 2011 · Physical Review. D, Particles, Fields, Gravitation and Cosmology · OSTI ID:1234852

Abazov, V. M.; Abbott, B.; Acharya, B. S.; +425 more

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
electroweak interaction
hadron-hadron scattering

Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV [Supplementary Data] Khachatryan, Vardan; Sirunyan, Albert M; Tumasyan, Armen https://doi.org/10.17182/hepdata.66567 The current record is supplemented by this dataset	dataset	February 2015
Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV [Supplemental Data] Khachatryan, Vardan; Sirunyan, Albert M.; Tumasyan, Armen https://doi.org/10.17182/hepdata.66567.v1 The current record is supplemented by this dataset	dataset	February 2015
"Table 1" of "Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at sqrt(s)=8 TeV" Collaboration, Cms https://doi.org/10.17182/hepdata.66567.v1/t1 The current record is supplemented by this dataset	dataset	January 2015
"Table 3" of "Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at sqrt(s)=8 TeV" Collaboration, Cms https://doi.org/10.17182/hepdata.66567.v1/t3 The current record is supplemented by this dataset	dataset	January 2015