Search for heavy neutrinos and right-handed $W$ bosons in events with two leptons and jets in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

This letter reports on a search for hypothetical heavy neutrinos, N, and right-handed gauge bosons, WR, in events with two high transverse momentum leptons and at least one high transverse momentum hadronic jet. The results were obtained from data corresponding to an integrated luminosity of 2.1 fb^-1 collected in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector at the CERN Large Hadron Collider. No excess above the Standard Model background expectation is observed. Excluded mass regions for Majorana and Dirac neutrinos are presented using two approaches for interactions that violate lepton and lepton-flavour numbers. One approach uses an effective operator framework, the other approach is guided by the Left-Right Symmetric Model. The results described in this letter represent the most stringent limits to date on the masses of heavy neutrinos and WR bosons obtained in direct searches.

Note:

9 pages plus author list (23 pages total), 4 figures, 3 tables, revised author list, matches version to appear in European Physical Journal C

13.85.Rm
16.60.St
12.38.Qk
p p: interaction
new particle: search for
neutrino: massive
W: right-handed
dilepton: final state
dilepton: charge
jet: transverse momentum

References(54)

Figures(9)

Neutrino oscillations, masses and mixing

W.M. Alberico
(
- Turin U. and
- INFN, Turin
)
,
S.M. Bilenky
(
- Dubna, JINR and
- INFN, Turin and
- Turin U.
)

- Phys.Part.Nucl. 35 (2004) 297-323,
- Fiz.Elem.Chast.Atom.Yadra 35 (2004) 545-596
•
e-Print:
- hep-ph/0306239

Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion

KamLAND

Collaboration

•

T. Araki
(
- Tohoku U.
)

et al.

- Phys.Rev.Lett. 94 (2005) 081801
•
e-Print:
- hep-ex/0406035
•
DOI:
- 10.1103/PhysRevLett.94.081801

Neutrino Mass and Spontaneous Parity Nonconservation

- Phys.Rev.Lett. 44 (1980) 912,
•
DOI:
- 10.1103/PhysRevLett.44.912

Neutrino Masses and Mixings in Gauge Models with Spontaneous Parity Violation

Rabindra N. Mohapatra
(
- City Coll., N.Y.
)
,
Goran Senjanovic
(
- Fermilab and
- Maryland U.
)

- Phys.Rev.D 23 (1981) 165
•
DOI:
- 10.1103/PhysRevD.23.165

Family Mass Hierarchy From Universal Seesaw Mechanism

Aharon Davidson
(
- Syracuse U.
)
,
Kameshwar C. Wali
(
- Syracuse U.
)

- Phys.Rev.Lett. 60 (1988) 1813
•
DOI:
- 10.1103/PhysRevLett.60.1813

The Search for Heavy Majorana Neutrinos

Anupama Atre
(
- Santa Barbara, KITP and
- Fermilab
)
,
Tao Han
(
)
,
Silvia Pascoli
(
- Durham U. and
- Durham U., IPPP
)
,
Bin Zhang
(
- Tsinghua U., Beijing
)

- JHEP 05 (2009) 030
•
e-Print:
- 0901.3589
•
DOI:
- 10.1088/1126-6708/2009/05/030

Majorana Neutrinos and the Production of the Right-handed Charged Gauge Boson

Wai-Yee Keung
(
- Brookhaven
)
,
Goran Senjanovic
(
- Brookhaven
)

- Phys.Rev.Lett. 50 (1983) 1427,
- Phys. Rev. Lett. 50 (1983) 1427-1430 and Brookhaven Nat. Lab. Upton - BNL-32872 (83,REC.MAY) 10p
•
DOI:
- 10.1103/PhysRevLett.50.1427