Szczegóły publikacji
Opis bibliograficzny
Search for $t\bar{t}$ resonances in the lepton plus jets final state with ATLAS using $4.7 fb^{-1}$ of pp collisions at $\sqrt{s}$=7 TeV / G. Aad, [et al.], L. ADAMCZYK, [et al.], T. BOŁD, [et al.], W. DĄBROWSKI, [et al.], M. DWUŻNIK, [et al.], I. GRABOWSKA-BOŁD, [et al.], D. KISIELEWSKA, [et al.], S. KOPERNY, [et al.], T. Z. KOWALSKI, [et al.], B. MINDUR, [et al.], M. PRZYBYCIEŃ, [et al.] // Physical Review. D, Particles, fields, gravitation, and cosmology ; ISSN 1550-7998. — 2013 — vol. 88 iss. 1, s. 012004-1–012004-28. — Bibliogr. s. 012004-14–012004-15
Autorzy (2000)
Dane bibliometryczne
| ID BaDAP | 77731 |
|---|---|
| Data dodania do BaDAP | 2013-11-18 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevD.88.012004 |
| Rok publikacji | 2013 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Review, D |
Abstract
A search for new particles that decay into top quark pairs (t (t) over bar) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb(-1) of proton-proton (pp) collision data collected at a center-of-mass energy root s = 7 TeV. In the t (t) over bar) -> WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The t (t) over bar) system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the t (t) over bar) invariant mass spectrum is performed. No evidence for a t (t) over bar) resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z' resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z' resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with m 15.3%. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.07 TeV.
