Hunting Mixed Top Squark Decays - INSPIRE

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Hunting Mixed Top Squark Decays

Dec, 2012

5 pages

Published in:

Phys.Rev.Lett. 111 (2013) 12, 121802

Published: Sep 18, 2013

e-Print:

1212.4495 [hep-ph]

DOI:

10.1103/PhysRevLett.111.121802

Report number:

LA-UR-12-26897

View in:

ADS Abstract Service

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Abstract: (APS)

We point out that, in the irreducible natural supersymmetric spectrum, top squarks have comparable branching fractions to chargino-bottom and neutralino-top final states in the vast bulk of parameter space, provided only that both decay modes are kinematically accessible. The total top squark pair branching fractions into tt¯+MET (MET=missing transverse energy) can therefore be reduced to O(50%), whereas bb¯+X branching fractions are typically much smaller, O(10%), thus limiting the reach of traditional top squark searches. We propose a new top squark search targeting the asymmetric final state t˜t˜*→tχ0b¯χ-+H.c., which can restore sensitivity to natural top squarks in the 7 and 8 TeV LHC runs. In addition, we present a new variable, topness, which efficiently suppresses the dominant top backgrounds to semileptonic top partner searches. We demonstrate the utility of topness in both our asymmetric search channel and traditional t˜t˜*→tt¯+MET searches and show that it matches or outperforms existing variables.

Note:

5 pages, 4 figures. V2: version accepted for publication in PRL

14.65.Ha
13.85.Rm
12.60.Jv
14.80.Ly
top: pair production
top: background
branching ratio
asymmetry
CERN LHC Coll
supersymmetry

References(24)

Figures(7)

[1]

The More minimal supersymmetric standard model

Andrew G. Cohen
(
- Boston U.
)
,
D.B. Kaplan
(
- Washington U., Seattle
)
,
A.E. Nelson
(
- Washington U., Seattle
)

- Phys.Lett.B 388 (1996) 588-598
•
e-Print:
- hep-ph/9607394
•
DOI:
- 10.1016/S0370-2693(96)01183-5

[2]

SUSY, the Third Generation and the LHC

Christopher Brust
(
- Johns Hopkins U. and
- Maryland U.
)
,
Andrey Katz
(
- Maryland U. and
- Harvard U., Phys. Dept.
)
,
Scott Lawrence
(
- Maryland U.
)
,
Raman Sundrum
(
- Maryland U.
)

- JHEP 03 (2012) 103
•
e-Print:
- 1110.6670
•
DOI:
- 10.1007/JHEP03(2012)103

[2]

Natural SUSY Endures

Michele Papucci
(
- UC, Berkeley and
- LBL, Berkeley
)
,
Joshua T. Ruderman
(
- UC, Berkeley and
- LBL, Berkeley
)
,
Andreas Weiler
(
- CERN and
- DESY
)

- JHEP 09 (2012) 035
•
e-Print:
- 1110.6926
•
DOI:
- 10.1007/JHEP09(2012)035

[3]

Squark and gluino decays for large tan beta

- Z.Phys.C 64 (1994) 499-508,
- Z.Phys.C 68 (1995) 518 (erratum)
•
DOI:
- 10.1007/BF01560111

[4]

Natural Supersymmetry: LHC, dark matter and ILC searches

Howard Baer
(
- Oklahoma U.
)
,
Vernon Barger
(
- Wisconsin U., Madison
)
,
Peisi Huang
(
- Wisconsin U., Madison
)
,
Xerxes Tata
(
- Hawaii U.
)

- JHEP 05 (2012) 109
•
e-Print:
- 1203.5539
•
DOI:
- 10.1007/JHEP05(2012)109

[4]

Probing Natural SUSY from Stop Pair Production at the LHC

Junjie Cao
(
- Henan Normal U. and
- Peking U., CHEP
)
,
Chengcheng Han
(
- Beijing, Inst. Theor. Phys.
)
,
Lei Wu
(
- Beijing, Inst. Theor. Phys.
)
,
Jin Min Yang
(
- Beijing, Inst. Theor. Phys.
)
,
Yang Zhang
(
- Henan Normal U. and
- Beijing, Inst. Theor. Phys.
)

- JHEP 11 (2012) 039
•
e-Print:
- 1206.3865
•
DOI:
- 10.1007/JHEP11(2012)039

[4]

The Higgs Sector and Fine-Tuning in the pMSSM

- Phys.Rev.D 86 (2012) 075015
•
e-Print:
- 1206.5800
•
DOI:
- 10.1103/PhysRevD.86.075015

[5]

LEP2 SUSY Working Group, ALEPH, DELPHI, L3 and OPAL experiments, notes LEPSUSYWG/02-04.1 and LEPSUSYWG/01-03.1

- http://lepsusy.web.cern.ch/lepsusy

[6]

Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in sqrt(s) = 8 TeV pp collisions using 13.0 ifb of ATLAS data

ATLAS

Collaboration

[7]

Search for direct top squark pair production in events with a single isolated lepton, jets and missing transverse energy at sqrt(s) = 8 TeV

CMS

Collaboration

[8]

Search for supersymmetry with the razor variables at CMS

CMS

Collaboration

[9]

Measuring masses of semiinvisibly decaying particles pair produced at hadron colliders

C.G. Lester
(
- Cambridge U.
)
,
D.J. Summers
(
- Cambridge U.
)

- Phys.Lett.B 463 (1999) 99-103
•
e-Print:
- hep-ph/9906349
•
DOI:
- 10.1016/S0370-2693(99)00945-4

[10]

Supersymmetric particle mass measurement with the boost-corrected contransverse mass

Giacomo Polesello
(
- INFN, Pavia
)
,
Daniel R. Tovey
(
- Sheffield U.
)

- JHEP 03 (2010) 030
•
e-Print:
- 0910.0174
•
DOI:
- 10.1007/JHEP03(2010)030

[11]

Stop the Top Background of the Stop Search

- JHEP 07 (2012) 110
•
e-Print:
- 1203.4813
•
DOI:
- 10.1007/JHEP07(2012)110

[12]

Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=7$ TeV $pp$ collisions using 4.7 $fb^{-1}$ of ATLAS data

ATLAS

Collaboration

•

Georges Aad
(
- Freiburg U.
)

et al.

- Phys.Rev.Lett. 109 (2012) 211803
•
e-Print:
- 1208.2590
•
DOI:
- 10.1103/PhysRevLett.109.211803

[13]

(Light) Stop Signs

Zhenyu Han
(
- Harvard U., Phys. Dept.
)
,
Andrey Katz
(
- Harvard U., Phys. Dept.
)
,
David Krohn
(
- Harvard U., Phys. Dept.
)
,
Matthew Reece
(
- Harvard U., Phys. Dept.
)

- JHEP 08 (2012) 083
•
e-Print:
- 1205.5808
•
DOI:
- 10.1007/JHEP08(2012)083

[14]

NLL soft and Coulomb resummation for squark and gluino production at the LHC

- JHEP 06 (2012) 052
•
e-Print:
- 1202.2260
•
DOI:
- 10.1007/JHEP06(2012)052

[15]

The total top-pair production cross section at NNLL

M. Beneke
(
- Munich, Tech. U. and
- RWTH Aachen U.
)
,
P. Falgari
(
- Utrecht U.
)
,
S. Klein
(
- RWTH Aachen U.
)
,
J. Piclum
(
- Munich, Tech. U. and
- RWTH Aachen U.
)
,
C. Schwinn
(
- Freiburg U.
)

et al.

- Nucl.Phys.B Proc.Suppl. 234 (2013) 101-104
•
e-Print:
- 1208.5578
•
DOI:
- 10.1016/j.nuclphysbps.2012.11.024

[16]

NNLL threshold resummation for top-pair and single-top production

Nikolaos Kidonakis
(
- Kennesaw State U.
)

- Phys.Part.Nucl. 45 (2014) 4, 714-722
•
e-Print:
- 1210.7813
•
DOI:
- 10.1134/S1063779614040091

[17]

MadGraph 5 : Going Beyond

Johan Alwall
(
- Fermilab
)
,
Michel Herquet
(
- NIKHEF, Amsterdam
)
,
Fabio Maltoni
(
- Louvain U., CP3
)
,
Olivier Mattelaer
(
- Louvain U., CP3
)
,
Tim Stelzer
(
- Illinois U., Urbana
)

- JHEP 06 (2011) 128
•
e-Print:
- 1106.0522
•
DOI:
- 10.1007/JHEP06(2011)128

[18]

PYTHIA 6.4 Physics and Manual

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)
,
Stephen Mrenna
(
- Fermilab
)
,
Peter Z. Skands
(
- Fermilab
)

- JHEP 05 (2006) 026
•
e-Print:
- hep-ph/0603175
•
DOI:
- 10.1088/1126-6708/2006/05/026

[19]

FastJet User Manual

Matteo Cacciari
(
- Paris, LPTHE and
- Diderot U., Paris
)
,
Gavin P. Salam
(
- CERN and
- Princeton U. and
- Paris, LPTHE
)
,
Gregory Soyez
(
- Saclay, SPhT
)

- Eur.Phys.J.C 72 (2012) 1896
•
e-Print:
- 1111.6097
•
DOI:
- 10.1140/epjc/s10052-012-1896-2

[20]

Single-top hadroproduction in association with a W boson

Stefano Frixione
(
- CERN and
- ITPP, Lausanne
)
,
Eric Laenen
(
- Amsterdam U. and
- NIKHEF, Amsterdam and
- Utrecht U.
)
,
Patrick Motylinski
(
- NIKHEF, Amsterdam
)
,
Bryan R. Webber
(
- Cambridge U.
)
,
Chris D. White
(
- NIKHEF, Amsterdam
)

- JHEP 07 (2008) 029
•
e-Print:
- 0805.3067
•
DOI:
- 10.1088/1126-6708/2008/07/029

[21]

QCD radiation in the production of heavy colored particles at the LHC

Johan Alwall
(
- SLAC
)
,
Simon de Visscher
(
- Louvain U., CP3
)
,
Fabio Maltoni
(
- Louvain U., CP3
)

- JHEP 02 (2009) 017
•
e-Print:
- 0810.5350
•
DOI:
- 10.1088/1126-6708/2009/02/017