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Measurement of the cross section ratio sigma(t t-bar b b- bar) / sigma(t t-bar jj) in pp collisions at sqrt(s) = 8 TeV


Khachatryan, Vardan; ...; Morović, Srećko; Ferenček, Dinko; Đurić, Senka; Godinović, Nikola; Lelas, Damir; Polić, Dunja; Puljak, Ivica; Antunović, Željko et al.
Measurement of the cross section ratio sigma(t t-bar b b- bar) / sigma(t t-bar jj) in pp collisions at sqrt(s) = 8 TeV // Physics letters B, 746 (2015), 132-153 doi:10.1016/j.physletb.2015.04.060 (međunarodna recenzija, članak, znanstveni)


Naslov
Measurement of the cross section ratio sigma(t t-bar b b- bar) / sigma(t t-bar jj) in pp collisions at sqrt(s) = 8 TeV
(Measurement of the cross section ratio σttbb/σttjj in pp collisions at √s=8 TeV)

Autori
Khachatryan, Vardan ; ... ; Morović, Srećko ; Ferenček, Dinko ; Đurić, Senka ; Godinović, Nikola ; Lelas, Damir ; Polić, Dunja ; Puljak, Ivica ; Antunović, Željko ; Kovač, Marko ; Brigljević, Vuko ; Kadija, Krešo ; Luetić, Jelena ; Mekterović, Darko ; Sudić, Lucija ; ... ; Woods, Nate

Izvornik
Physics letters B (0370-2693) 746 (2015); 132-153

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
High energy physics; experimental particle physics; LHC; CMS; standard model

Sažetak
The first measurement of the cross section ratio sigma(t t- bar b b-bar) / sigma(t t-bar jj) is presented using a data sample corresponding to an integrated luminosity of 19.6 inverse femtobarns collected in pp collisions at sqrt(s) = 8 TeV with the CMS detector at the LHC. Events with two leptons (e or mu) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum pt of both 20 and 40 GeV. The measured ratio is 0.022 +/- 0.003 (stat) +/- 0.005 (syst) for pt > 20 GeV. The absolute cross sections sigma(t t-bar b b-bar) and sigma(t t-bar jj) are also measured. The measured ratio for pt > 40 GeV is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
CMS Collaboration



POVEZANOST RADA


Projekt / tema
HRZZ-09.01/346 - Potraga za novim standardnim modelom elementarnih čestica na LHC-u: od preciznih mjerenja elektroslabih procesa do direktnih potraga za novom fizikom (Vuko Brigljević, )
HRZZ-IP-2013-11-7118 - Mjerenje svojstava Higgsovog bozona i potraga za novom fizikom detektorom CMS (Ivica Puljak, )

Ustanove
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Split

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Citati