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Title: Revealing compressed stops using high-momentum recoils

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [1];  [3]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Rutgers Univ., Piscataway, NJ (United States); Stanford Univ., Stanford, CA (United States)
  3. Univ. of Pittsburgh, Pittsburgh, PA (United States)
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In this study, searches for supersymmetric top quarks at the LHC have been making great progress in pushing sensitivity out to higher mass, but are famously plagued by gaps in coverage around lower-mass regions where the decay phase space is closing off. Within the common stop-NLSP/neutralino-LSP simplified model, the line in the mass plane where there is just enough phase space to produce an on-shell top quark remains almost completely unconstrained. Here, we show that is possible to define searches capable of probing a large patch of this difficult region, with S/B ~ 1 and significances often well beyond 5σ. The basic strategy is to leverage the large energy gain of LHC Run 2, leading to a sizable population of stop pair events recoiling against a hard jet. The recoil not only re-establishes a ET, but also leads to a distinctive anti-correlation between the ET and the recoil jet transverse vectors when the stops decay all-hadronically. Accounting for jet combinatorics, backgrounds, and imperfections in ET measurements, we estimate that Run 2 will already start to close the gap in exclusion sensitivity with the first few 10s of fb–1. By 300 fb–1, exclusion sensitivity may extend from stop masses of 550 GeV on the high side down to below 200 GeV on the low side, approaching the “stealth” point at mt¯ = mt and potentially overlapping with limits from tt¯ cross section and spin correlation measurements.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States); Univ. of Wisconsin, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0003883; FG02-95ER40896
OSTI ID:
1326973
Journal Information:
Journal of High Energy Physics (Online), Vol. 2016, Issue 3; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

References (24)

Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in p p Collisions at s = 8     TeV Using the ATLAS Detector journal April 2015
Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in p p collisions at s = 8     TeV with the ATLAS detector journal September 2014
Measurement of the $$t\overline{t}$$ t t ¯ production cross-section using $$e\mu $$ e μ events with $$b$$ b -tagged jets in $$pp$$ p p collisions at $$\sqrt{s}=7$$ s = 7 and 8 TeV with the ATLAS detector journal October 2014
Search for direct top squark pair production in events with a $$Z$$ Z boson, $$b$$ b -jets and missing transverse momentum in $$\sqrt{s}=8$$ s = 8 TeV $$pp$$ p p collisions with the ATLAS detector journal June 2014
Search for supersymmetry using razor variables in events with b -tagged jets in p p collisions at s = 8     TeV journal March 2015
Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at s = 8 TeV journal September 2014
Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$ journal December 2013
Search for Top Squark and Higgsino Production Using Diphoton Higgs Boson Decays journal April 2014
Search for pair-produced resonances decaying to jet pairs in proton–proton collisions at s = 8  TeV journal July 2015
(Light) stop signs journal August 2012
Removing Gaps in the Exclusion of Top Squark Parameter Space journal November 2014
Sneaky light stop journal April 2015
Probing light stops with stoponium journal July 2015
Cornering light stops with dileptonic m T2 journal April 2013
The status of GMSB after 1/fb at the LHC journal February 2012
Improving the sensitivity of stop searches with on-shell constrained invariant mass variables journal May 2015
The anti- k t jet clustering algorithm journal April 2008
Dispelling the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>N</mml:mi><mml:mn>3</mml:mn></mml:msup></mml:math> myth for the <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msub><mml:mi>k</mml:mi><mml:mi>t</mml:mi></mml:msub></mml:math> jet-finder journal September 2006
Boosting stop searches with a 100 TeV proton collider journal November 2014
Top partners in little Higgs theories with T parity journal September 2006
Opening Up the Compressed Region of Top Squark Searches at 13 TeV LHC journal October 2015
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations journal July 2014
PYTHIA 6.4 physics and manual journal May 2006
ALPGEN, a generator for hard multiparton processes in hadronic collisions journal July 2003

Cited By (8)

Enhancing the discovery prospects for SUSY-like decays with a forgotten kinematic variable journal May 2019
Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths journal July 2018
Compressed stop searches with two leptons and two b -jets journal February 2019
Top-philic dark matter within and beyond the WIMP paradigm text January 2018
Exploring the nearly degenerate stop region with sbottom decays text January 2016
Top-philic dark matter within and beyond the WIMP paradigm text January 2018
Compressed Stop Searches with Two Leptons and Two b-jets text January 2017
Magnifying the ATLAS Stealth Stop Splinter: Impact of Spin Correlations and Finite Widths text January 2018

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Hadronic Colliders
Supersymmetry Phenomenology