This Letter reports the observation of a high transverse momentum Z→bb¯ signal in proton–proton collisions at √s=8 TeV and the measurement of its production cross section. The data analysed were collected in 2012 with the ATLAS detector at the LHC and correspond to an integrated luminosity of 19.5 fb −1 . The Z→bb¯ decay is reconstructed from a pair of b -tagged jets, clustered with the anti- kt jet algorithm with R=0.4 , that have low angular separation and form a dijet with pT>200 GeV . The signal yield is extracted from a fit to the dijet invariant mass distribution, with the dominant, multi-jet background mass shape estimated by employing a fully data-driven technique that reduces the dependence of the analysis on simulation. The fiducial cross section is determined to be σZ→bb¯fid=2.02±0.20 (stat.) ±0.25 (syst.)±0.06 (lumi.) pb=2.02±0.33 pb, in good agreement with next-to-leading-order theoretical predictions.

Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., et al. (2014). Measurement of the cross section of high transverse momentum Z → bb production in proton–proton collisions at √s = 8 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 738, 25-43 [10.1016/j.physletb.2014.09.020].

Measurement of the cross section of high transverse momentum Z → bb production in proton–proton collisions at √s = 8 TeV with the ATLAS detector

V. Bortolotto;F. Ceradini;B. Di Micco;D. Orestano;F. Petrucci;M. Trovatelli;
2014-01-01

Abstract

This Letter reports the observation of a high transverse momentum Z→bb¯ signal in proton–proton collisions at √s=8 TeV and the measurement of its production cross section. The data analysed were collected in 2012 with the ATLAS detector at the LHC and correspond to an integrated luminosity of 19.5 fb −1 . The Z→bb¯ decay is reconstructed from a pair of b -tagged jets, clustered with the anti- kt jet algorithm with R=0.4 , that have low angular separation and form a dijet with pT>200 GeV . The signal yield is extracted from a fit to the dijet invariant mass distribution, with the dominant, multi-jet background mass shape estimated by employing a fully data-driven technique that reduces the dependence of the analysis on simulation. The fiducial cross section is determined to be σZ→bb¯fid=2.02±0.20 (stat.) ±0.25 (syst.)±0.06 (lumi.) pb=2.02±0.33 pb, in good agreement with next-to-leading-order theoretical predictions.
2014
Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., et al. (2014). Measurement of the cross section of high transverse momentum Z → bb production in proton–proton collisions at √s = 8 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 738, 25-43 [10.1016/j.physletb.2014.09.020].
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S0370269314006704-main.pdf

accesso aperto

Descrizione: Articolo principale
Tipologia: Versione Editoriale (PDF)
Licenza: DRM non definito
Dimensione 1.35 MB
Formato Adobe PDF
1.35 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/118032
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 11
social impact