Search for direct pair production of sleptons and charginos decaying to two leptons and neutralinos with mass splittings near the W-boson mass in $ \sqrt{s} $ = 13 TeV pp collisions with the ATLAS detector

A search for the electroweak production of pairs of charged sleptons or charginos decaying into two-lepton final states with missing transverse momentum is presented. Two simplified models of R-parity-conserving supersymmetry are considered: direct pair-production of sleptons

\left(\overset{\sim }{\ell}\overset{\sim }{\ell}\right)

, with each decaying into a charged lepton and a

{\overset{\sim }{\chi}}_1^0

neutralino, and direct pair-production of the lightest charginos

\left({\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_1^{\mp}\right)

, with each decaying into a W-boson and a

{\overset{\sim }{\chi}}_1^0

. The lightest neutralino

\left({\overset{\sim }{\chi}}_1^0\right)

is assumed to be the lightest supersymmetric particle (LSP). The analyses target the experimentally challenging mass regions where

m\left(\overset{\sim }{\ell}\right)-m\left({\overset{\sim }{\chi}}_1^0\right)

and

m\left({\overset{\sim }{\chi}}_1^{\pm}\right)-m\left({\overset{\sim }{\chi}}_1^0\right)

are close to the W-boson mass (‘moderately compressed’ regions). The search uses 139 fb

^{−1}

of

\sqrt{s}

= 13 TeV proton-proton collisions recorded by the ATLAS detector at the Large Hadron Collider. No significant excesses over the expected background are observed. Exclusion limits on the simplified models under study are reported in the

\left(\overset{\sim }{\ell },{\overset{\sim }{\chi}}_1^0\right)

and

\left({\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_1^0\right)

mass planes at 95% confidence level (CL). Sleptons with masses up to 150 GeV are excluded at 95% CL for the case of a mass-splitting between sleptons and the LSP of 50 GeV. Chargino masses up to 140 GeV are excluded at 95% CL for the case of a mass-splitting between the chargino and the LSP down to about 100 GeV.[graphic not available: see fulltext]

Note:

58 pages in total, author list starting page 41, 9 figures, 11 tables, published in JHEP 06 (2023) 031. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2019-02/

Hadron-Hadron Scattering
Supersymmetry
p p: scattering
p p: colliding beams
slepton: direct production
chargino: direct production
slepton: pair production
chargino: pair production
transverse momentum: missing-energy
chargino: mass: lower limit

References(125)

Figures(23)

[1]

Extension of the Algebra of Poincare Group Generators and Violation of p Invariance

Yu.A. Golfand
(
- Lebedev Inst.
)
,
E.P. Likhtman
(
- Lebedev Inst.
)

- JETP Lett. 13 (1971) 323-326,
- Pisma Zh.Eksp.Teor.Fiz. 13 (1971) 452-455,
•
DOI:
- 10.1142/9789814542340_0001

[2]

Is the Neutrino a Goldstone Particle?

D.V. Volkov
(
- Kharkov, KIPT
)
,
V.P. Akulov
(
- Kharkov, KIPT
)

- Phys.Lett.B 46 (1973) 109-110,
- also in *FERRARA, S. (ED.): SUPERSYMMETRY, VOL. 1*, 11-12
•
DOI:
- 10.1016/0370-2693(73)90490-5

Supergauge Transformations in Four-Dimensions

J. Wess
(
- Karlsruhe U.
)
,
B. Zumino
(
- CERN
)

- Nucl.Phys.B 70 (1974) 39-50,
- In *Ferrara, S. (ed.): Supersymmetry, Vol. 1*, 13-24,
•
DOI:
- 10.1016/0550-3213(74)90355-1

Supergauge Invariant Extension of Quantum Electrodynamics

J. Wess
(
- Karlsruhe U.
)
,
B. Zumino
(
- CERN
)

- Nucl.Phys.B 78 (1974) 1,
- IN *FERRARA, S. (ED.): SUPERSYMMETRY, VOL. 1*, 80-92. (NUCL. PHYS. B78 (1974) 1-13) AND CERN GENEVA - TH. 1857 (74,REC.MAY) 16 P. (SEE BOOK INDEX)
•
DOI:
- 10.1016/0550-3213(74)90112-6

[5]

Supergauge Invariant Yang-Mills Theories

S. Ferrara
(
- CERN
)
,
B. Zumino
(
- CERN
)

- Nucl.Phys.B 79 (1974) 413,
- IN *FERRARA, S. (ED.): SUPERSYMMETRY, VOL. 1*, 93-101. (NUCL. PHYS. B79 (1974) 413-421) AND CERN GENEVA - TH. 1866 (74,REC.JUN.) 12 P. (SEE BOOK INDEX)
•
DOI:
- 10.1016/0550-3213(74)90559-8

[6]

Supersymmetry and Nonabelian Gauges

Abdus Salam
(
- ICTP, Trieste and
- Imperial Coll., London
)
,
J.A. Strathdee
(
- ICTP, Trieste
)

- Phys.Lett.B 51 (1974) 353-355,
- Also in *Ferrara, S. (ed.): Supersymmetry, vol. 1*, 102-104,
- Also in *Ali, A. (ed.) et al.: Selected papers of Abdus Salam* 420-422
•
DOI:
- 10.1016/0370-2693(74)90226-3