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Journal of High Energy Physics

, 2017:130 | Cite as

About the rapidity and helicity distributions of the W bosons produced at LHC

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Regular Article - Experimental Physics
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Abstract

W bosons are produced at LHC from a forward-backward symmetric initial state. Their decay to a charged lepton and a neutrino has a strong spin analysing power. The combination of these effects results in characteristic distributions of the pseudorapidity of the leptons decaying from W+ and W− of different helicity. This observation may open the possibility to measure precisely the W+ and W− rapidity distributions for the two transverse polarisation states of W bosons produced at small transverse momentum.

Keywords

Electroweak interaction Hadron-Hadron scattering (experiments) 
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References

  1. [1]
    CDF collaboration, T. Aaltonen et al., Direct Measurement of the W Production Charge Asymmetry in \( p\overline{p} \) Collisions at \( \sqrt{s}=1.96 \) TeV, Phys. Rev. Lett. 102 (2009) 181801 [arXiv:0901.2169] [INSPIRE].
  2. [2]
    D0 collaboration, V.M. Abazov et al., Measurement of the W Boson Production Charge Asymmetry in \( p\overline{p}\to W+X\to e\nu +X \) Events at \( \sqrt{s}=1.96 \) TeV, Phys. Rev. Lett. 112 (2014) 151803 [Erratum ibid. 114 (2015) 049901] [arXiv:1312.2895] [INSPIRE].
  3. [3]
    A. Bodek, Y. Chung, B.-Y. Han, K.S. McFarland and E. Halkiadakis, New analysis technique to measure the W production charge asymmetry at the Fermilab Tevatron, Phys. Rev. D 77 (2008) 111301 [arXiv:0711.2859] [INSPIRE].
  4. [4]
    CDF collaboration, F. Abe et al., Measurement of the Lepton Charge Asymmetry in W Boson Decays Produced in pp Collisions, Phys. Rev. Lett. 81 (1998) 5754 [hep-ex/9809001] [INSPIRE].
  5. [5]
    CDF collaboration, D. Acosta et al., Measurement of the forward-backward charge asymmetry from W → eν production in \( p\overline{p} \) collisions at \( \sqrt{s}=1.96 \) TeV, Phys. Rev. D 71 (2005) 051104 [hep-ex/0501023] [INSPIRE].
  6. [6]
    D0 collaboration, V.M. Abazov et al., Measurement of the muon charge asymmetry from W boson decays, Phys. Rev. D 77 (2008) 011106 [arXiv:0709.4254] [INSPIRE].
  7. [7]
    D0 collaboration, V.M. Abazov et al., Measurement of the electron charge asymmetry in \( p\overline{p}\to W+X\to e\nu +X \) events at \( \sqrt{s}=1.96 \) TeV, Phys. Rev. Lett. 101 (2008) 211801 [arXiv:0807.3367] [INSPIRE].
  8. [8]
    D0 collaboration, V.M. Abazov et al., Measurement of the muon charge asymmetry in \( p\overline{p}\to W+X\to \mu \nu +X \) events at \( \sqrt{s}=1.96 \) TeV, Phys. Rev. D 88 (2013) 091102 [arXiv:1309.2591] [INSPIRE].
  9. [9]
    D0 collaboration, V.M. Abazov et al., Measurement of the electron charge asymmetry in \( p\overline{p}\to W+X\to e\nu +X \) decays in \( p\overline{p} \) collisions at \( \sqrt{s}=1.96 \) TeV, Phys. Rev. D 91 (2015) 032007 [Erratum ibid. 91 (2015) 079901] [arXiv:1412.2862] [INSPIRE].
  10. [10]
    ATLAS collaboration, Measurement of the W charge asymmetry in the W → μν decay mode in pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Phys. Lett. B 701 (2011) 31 [arXiv:1103.2929] [INSPIRE].
  11. [11]
    CMS collaboration, Measurement of the lepton charge asymmetry in inclusive W production in pp collisions at \( \sqrt{s}=7 \) TeV, JHEP 04 (2011) 050 [arXiv:1103.3470] [INSPIRE].
  12. [12]
    CMS collaboration, Measurement of the electron charge asymmetry in inclusive W production in pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Rev. Lett. 109 (2012) 111806 [arXiv:1206.2598] [INSPIRE].
  13. [13]
    CMS collaboration, Measurement of the muon charge asymmetry in inclusive pp → W + X production at \( \sqrt{s}=7 \) TeV and an improved determination of light parton distribution functions, Phys. Rev. D 90 (2014) 032004 [arXiv:1312.6283] [INSPIRE].
  14. [14]
    CMS collaboration, Measurement of the differential cross section and charge asymmetry for inclusive pp → W ± + X production at \( \sqrt{s}=8 \) TeV, Eur. Phys. J. C 76 (2016) 469 [arXiv:1603.01803] [INSPIRE].
  15. [15]
    LHCb collaboration, Measurement of forward W and Z boson production in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 01 (2016) 155 [arXiv:1511.08039] [INSPIRE].
  16. [16]
    LHCb collaboration, Measurement of forward W → eν production in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 10 (2016) 030 [arXiv:1608.01484] [INSPIRE].
  17. [17]
    K. Lohwasser, J. Ferrando and C. Issever, On direct measurement of the W production charge asymmetry at the LHC, JHEP 09 (2010) 079 [arXiv:1005.3196] [INSPIRE].ADSCrossRefGoogle Scholar
  18. [18]
    W.J. Stirling and A.D. Martin, Parton Distribution Uncertainty in the Measurement of M W in Proton-Antiproton Collisions, Phys. Lett. B 237 (1990) 551 [INSPIRE].ADSCrossRefGoogle Scholar
  19. [19]
    CDF collaboration, T.A. Aaltonen et al., Precise measurement of the W-boson mass with the Collider Detector at Fermilab, Phys. Rev. D 89 (2014) 072003 [arXiv:1311.0894] [INSPIRE].
  20. [20]
    D0 collaboration, V.M. Abazov et al., Measurement of the W boson mass with the D0 detector, Phys. Rev. D 89 (2014) 012005 [arXiv:1310.8628] [INSPIRE].
  21. [21]
    ATLAS collaboration, Measurement of the W-boson mass in pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, arXiv:1701.07240 [INSPIRE].
  22. [22]
    NNPDF collaboration, R.D. Ball et al., Parton distributions from high-precision collider data, Eur. Phys. J. C 77 (2017) 663 [arXiv:1706.00428] [INSPIRE].
  23. [23]
    T. Sjöstrand et al., An Introduction to PYTHIA 8.2, Comput. Phys. Commun. 191 (2015) 159 [arXiv:1410.3012] [INSPIRE].
  24. [24]
    S. Catani, D. de Florian, G. Ferrera and M. Grazzini, Vector boson production at hadron colliders: transverse-momentum resummation and leptonic decay, JHEP 12 (2015) 047 [arXiv:1507.06937] [INSPIRE].ADSGoogle Scholar

Copyright information

© The Author(s) 2017

Authors and Affiliations

  1. 1.Scuola Normale SuperiorePisaItaly
  2. 2.Istituto Nazionale di Fisica Nucleare (INFN) — Sezione di Pisa, Edificio C — Polo FibonacciPisaItaly
  3. 3.CERNGenevaSwitzerland

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