Single production of an exotic bottom partner at LHC

被引：4

作者：

Alvarez, Ezequiel ^{[1
,2
]}

Da Rold, Leandro ^{[3
,4
]}

Sanchez Vietto, Juan Ignacio ^{[1
,2
]}

机构：

[1] Univ Buenos Aires, FCEyN, CONICET, IFIBA, RA-1428 Buenos Aires, DF, Argentina

[2] Univ Buenos Aires, FCEyN, Dept Fis, RA-1428 Buenos Aires, DF, Argentina

[3] Consejo Nacl Invest Cient & Tecn, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 02期

关键词：

Beyond Standard Model; Heavy Quark Physics; Technicolor and Composite Models;

D O I：

10.1007/JHEP02(2014)010

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A We study single production and detection at the LHC run II of exotic partners of the bottom quark. For masses larger than 1 TeV single production can dominate over pair production that is suppressed due to phase space. The presence of exotic partners of the bottom is motivated in models aiming to solve the A(FB)(b) anomaly measured at LEP and SLC. Minimal models of this type with partial compositeness predict, as the lightest bottom partner, a new fermion V of electric charge -4/3, also called mirror. The relevant coupling for our study is a WVb vertex, which yields a signal that corresponds to a hard W, a hard b-jet and a forward light jet. We design a search strategy for the leptonic decay of the W, which avoids the large QCD multijet background and its large uncertainties. We find that the main backgrounds are W+jets and t (t) over bar, and the key variables to enhance the signal over them are a hard b-jet and the rapidity of the light jet. We determine the discovery reach for the LHC run II, in particular we predict that, for couplings of order similar to g/10, this signal could be detected at a 95% confidence level with a mass up to 2.4 TeV using the first 100 fb(-1).

引用

页数：27

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