Skip to main content
SpringerLink
Log in

Data Analysis

  • Chapter
  • First Online:
Measurement of Quarkonium Polarization to Probe QCD at the LHC

Part of the book series: Springer Theses ((Springer Theses))

  • 260 Accesses

Abstract

This chapter describes in detail the measurements of quarkonium polarization with the CMS detector. The general analysis strategy, applicable to all the CMS quarkonium polarization analyses, is described in Sect. 4.1, while the details of the individual analyses are described in Sects. 4.2 and 4.3, for the analysis of the polarizations of the \(\Upsilon (nS)\) and prompt \(\psi (nS)\) states, respectively. These measurements were conducted in a team effort, involving undergraduate and graduate students, as well as senior scientists, from several institutions, including HEPHY (Vienna, Austria), CERN (Geneva, Switzerland), LIP (Lisbon, Portugal) and PKU (Beijing, China).

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Log in via an institution
Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 39.99
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 54.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info
Hardcover Book
USD 54.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

Notes

  1. 1.

    Binning of the \(\rho \)-factor studies: 10 bins in \(\cos \vartheta ^{\scriptscriptstyle PX}\), 12 bins in \(\varphi ^{\scriptscriptstyle PX}\) and 5 bins in dimuon \(p_\mathrm {T}\), covering the range \(10<p_\mathrm {T}<50\) GeV.

  2. 2.

    Binning of the \(\rho \)-factor studies: 20 bins in \(\cos \vartheta ^{\scriptscriptstyle PX}\), 24 bins in \(\varphi ^{\scriptscriptstyle PX}\) and 16 bins in dimuon \(p_\mathrm {T}\), covering the range \(10<p_\mathrm {T}<70\) GeV.

References

  1. CMS Collaboration (2013) Measurement of the \(\Upsilon (1S)\), \(\Upsilon (2S)\) and \(\Upsilon (3S)\) polarizations in \(pp\) collisions at \(\sqrt{s}=7\,{\rm {TeV}}\). Phys Rev Lett 110:081802

    Google Scholar 

  2. CMS Collaboration (2013) Measurement of the prompt \(J/\psi \) and \(\psi \)(2S) polarizations in pp collisions at \(\sqrt{s} = 7~{\rm {TeV}}\). Phys Lett B 727:381

    Google Scholar 

  3. Faccioli P, Seixas J, Knünz V (2012) A new procedure for the determination of angular distribution parameters in dilepton vector meson decays. CMS AN-11-535 (Internal Note, Unpublished)

    Google Scholar 

  4. Wöhri H, Krätschmer I, Zhang L, Wang J (2012) T&P single muon efficiencies for low \(p_T\) dimuon triggers in 2011. CMS AN-11-417 (Internal Note, Unpublished)

    Google Scholar 

  5. Wöhri H, Krätschmer I, Zhang L, Knünz V et al (2012) Low \(p_T\) muon and dimuon efficiencies. CMS AN-12-088 (Internal Note, Unpublished)

    Google Scholar 

  6. Knünz V, Faccioli P, Lourenço C, Krätschmer I et al (2012) Measurement of the \(\Upsilon (1S)\), \(\Upsilon (2S)\) and \(\Upsilon (3S)\) polarizations in \(pp\) collisions at \(\sqrt{s} = 7~{\rm {TeV}}\). CMS AN-12-140 (Internal Note, Unpublished)

    Google Scholar 

  7. Krätschmer I, Zhang L, Knünz V, Wöhri H et al (2013) \(J/\psi \) and \(\psi (2S)\) polarizations in \(pp\) collisions at \(\sqrt{s}= 7~{\rm {TeV}}\). CMS AN-13-016 (Internal Note, Unpublished)

    Google Scholar 

  8. Faccioli P, Lourenço C, Seixas J, Wöhri H (2009) J/\(\psi \) polarization from fixed-target to collider energies. Phys Rev Lett 102:151802

    Article  ADS  Google Scholar 

  9. Faccioli P, Lourenço C, Seixas J (2010) Rotation-invariant relations in vector meson decays into fermion pairs. Phys Rev Lett 105:061601

    Article  ADS  Google Scholar 

  10. Faccioli P, Lourenço C, Seixas J (2010) A new approach to quarkonium polarization studies. Phys Rev D 81:111502

    Article  ADS  Google Scholar 

  11. Faccioli P, Lourenço C, Seixas J, Wöhri H (2011) Model-independent constraints on the shape parameters of dilepton angular distributions. Phys Rev D 83:056008

    Article  ADS  Google Scholar 

  12. Faccioli P, Lourenço C, Seixas J, Wöhri H (2010) Towards the experimental clarification of quarkonium polarization. Eur Phys J C 69:657

    Article  ADS  Google Scholar 

  13. Faccioli P, Lourenço C, Seixas J, Wöhri H (2011) Determination of \(\chi _c\) and \(\chi _b\) polarizations from dilepton angular distributions in radiative decays. Phys Rev D 83:096001

    Article  ADS  Google Scholar 

  14. James F, Winkler M (2004) Minuit user’s guide. CERN, Geneva. http://seal.web.cern.ch/seal/documents/minuit/mnusersguide.pdf

  15. Knünz V, Adam W, Frühwirth R, Strauss J (2011) Studies of the \(J/\psi \) polarization fit with a toy Monte Carlo program. CMS AN-11-087 (Internal Note, Unpublished)

    Google Scholar 

  16. CMS Collaboration (2011) Measurements of inclusive \(W\) and \(Z\) cross sections in pp collisions at \(\sqrt{s}=7\,{\rm {TeV}}\). J High Energy Phys 1101:080

    Google Scholar 

  17. Hastings WK (1970) Monte Carlo sampling methods using Markov chains and their applications. Biometrika 57:97

    Google Scholar 

  18. HERA-B Collaboration (2009) Kinematic distributions and nuclear effects of \(J/\psi \) production in 920-GeV fixed-target proton-nucleus collisions. Eur Phys J C 60:525

    Google Scholar 

  19. CMS Collaboration (2012) \(J/\psi \) and \(\psi (2S)\) production in \(pp\) collisions at \(\sqrt{s}=7\,{\rm {TeV}}\). J High Energy Phys 1202:011

    Google Scholar 

  20. CMS Collaboration (2013) Measurement of the \(\Upsilon (1S), \Upsilon (2S)\), and \(\Upsilon (3S)\) cross sections in pp collisions at \(\sqrt{s} = 7~{\rm {TeV}}\). Phys Lett B 727:101

    Google Scholar 

  21. Olive KA et al (2014) Particle data group. Chin Phys C 38:090001

    Article  ADS  Google Scholar 

  22. Sjostrand T, Mrenna S, Skands PZ (2006) PYTHIA 6.4 physics and manual. J High Energy Phys 0605:026

    Article  ADS  Google Scholar 

  23. Krätschmer I (2012) Understanding Muon Detection Efficiencies for Quarkonium Polarization Measurements at the Compact Muon Solenoid. Diploma thesis, Institute of High Energy Physics, Vienna University of Technology

    Google Scholar 

  24. Drell SD, Yan TM (1970) Massive lepton pair production in hadron–hadron collisions at high-energies. Phys Rev Lett 25:316

    Article  ADS  Google Scholar 

  25. Supplemental Material. Rev Lett 110:081802 (2013)

    Google Scholar 

  26. ATLAS Collaboration (2011) Measurement of the differential cross-sections of inclusive, prompt and non-prompt \(J/\psi \) production in proton–proton collisions at \(\sqrt{s}=7~{\rm {TeV}}\). Nucl Phys B 850:387

    Google Scholar 

  27. ATLAS Collaboration (2014) Measurement of the production cross-section of \(\psi (2S) \rightarrow J/\psi ( \rightarrow \mu ^{+} \mu ^{-}) \pi ^{+} \pi ^{-}\) in pp collisions at \(\sqrt{s} = 7~{\rm {TeV}}\) at ATLAS. J High Energy Phys 1409:79

    Google Scholar 

  28. Supplemental Material of Phys Lett B 727:381 (2013)

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Experimental Physics Department, CERN, Geneva, Switzerland

    Valentin Knünz

Authors
  1. Valentin Knünz
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Valentin Knünz .

Rights and permissions

Reprints and permissions

Copyright information

© 2017 Springer International Publishing Switzerland

About this chapter

Cite this chapter

Knünz, V. (2017). Data Analysis. In: Measurement of Quarkonium Polarization to Probe QCD at the LHC. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-49935-2_4

Download citation

Publish with us

Policies and ethics

Search

Navigation