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Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector
This Letter presents a search for heavy charged long-lived particles produced in proton--proton collisions at $\sqrt{s}=13$ TeV at the LHC using a data sample corresponding to an integrated luminosity of $36.1$ fb$^{-1}$ collected by the ATLAS experiment in 2015 and 2016. These particles are expected to travel with a velocity significantly below the speed of light, and therefore have a specific ionisation higher than any high-momentum Standard Model particle of unit charge. The pixel subsystem of the ATLAS detector is used in this search to measure the ionisation energy loss of all reconstructed charged particles which traverse the pixel detector. Results are interpreted assuming the pair production of $R$-hadrons as composite colourless states of a long-lived gluino and Standard Model partons. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on $R$-hadron production cross-sections and gluino masses are set, assuming the gluino always decays in two quarks and a stable neutralino. $R$-hadrons with lifetimes above 1.0 ns are excluded at the $95\%$ confidence level, with lower limits on the gluino mass ranging between 1290 GeV and 2060 GeV. In the case of stable $R$-hadrons, the lower limit on the gluino mass at the $95\%$ confidence level is 1890 GeV.
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The number of events in each CR, VR, and SR for the predicted background, for the expected contribution from the...
Event Yields 2
10.17182/hepdata.83962.v1/t2
The number of events in each CR, VR, and SR for the predicted background, for the expected contribution from the...
Cutflow 1
10.17182/hepdata.83962.v1/t3
Expected number of $R$-hadron signal events at different stages of the selection, normalised to $36.1$ fb$^{-1}$. Shown for three different...
Cross section UL 1
10.17182/hepdata.83962.v1/t4
The observed and expected 95% CL upper limits on model-independent visible cross-sections, along with the observed $p0$ values, for the...
Cross section UL 2
10.17182/hepdata.83962.v1/t5
The observed and expected 95% CL upper limits on model-independent visible cross-sections, along with the observed $p0$ values, for the...
Mass windows definition
10.17182/hepdata.83962.v1/t6
For each gluino lifetime and mass in the signal samples, the lower boundary of the mass window in which at...
Acceptance / Efficiency 1
10.17182/hepdata.83962.v1/t7
Acceptance and efficiency for a representative set of pair-produced gluino signal samples. The mass of the gluino ($m(\tilde{g})$), its lifetime...
SR plot 1
10.17182/hepdata.83962.v1/t8
The reconstructed candidate track mass distributions for observed data, predicted background, and the expected contribution from two signal models in...
SR plot 2
10.17182/hepdata.83962.v1/t9
The reconstructed candidate track mass distributions for observed data, predicted background, and the expected contribution from two signal models in...
UL Cross section 1
10.17182/hepdata.83962.v1/t10
The 95% CL upper limit on the cross-section as a function of mass for gluinos with lifetime $\tau = 10$...
UL Cross section 2
10.17182/hepdata.83962.v1/t11
The 95% CL upper limit on the cross-section as a function of mass for stable gluino $R$-hadrons, with the observed...
Exclusion contour 1 (obs.)
10.17182/hepdata.83962.v1/t12
Observed 95% lower limits on the gluino mass in the gluino lifetime--mass plane. The excluded area is to the left...
Exclusion contour 1 (exp.)
10.17182/hepdata.83962.v1/t13
Expected 95% lower limits on the gluino mass in the gluino lifetime--mass plane. The excluded area is to the left...
UL Cross section 3
10.17182/hepdata.83962.v1/t14
The 95% CL upper limit on the cross-section as a function of mass for gluinos with lifetime $\tau = 1$...
UL Cross section 4
10.17182/hepdata.83962.v1/t15
The 95% CL upper limit on the cross-section as a function of mass for gluinos with lifetime $\tau = 3$...
UL Cross section 5
10.17182/hepdata.83962.v1/t16
The 95% CL upper limit on the cross-section as a function of mass for gluinos with lifetime $\tau = 30$...
UL Cross section 6
10.17182/hepdata.83962.v1/t17
The 95% CL upper limit on the cross-section as a function of mass for gluinos with lifetime $\tau = 50$...
Reconstructed Mass 1
10.17182/hepdata.83962.v1/t18
The relationship between generated and reconstructed mass for gluino $R$-hadrons. Above 1500 GeV, the reconstructed mass falls below the generated...
Acceptance / Efficiency MET 1
10.17182/hepdata.83962.v1/t19
The parameterised efficiency for events to pass metastable event selections (including trigger, E$_{T}^{miss}$, and event cleaning requirements) as a function...
Acceptance / Efficiency MET 2
10.17182/hepdata.83962.v1/t20
The parameterised efficiency for events to pass metastable event selections (including trigger, E$_{T}^{miss}$, and event cleaning requirements) as a function...
Acceptance / Efficiency Particle 1
10.17182/hepdata.83962.v1/t21
The parameterised efficiency for particles to pass full track selections in the metastable signal region, as function of the particle’s...
Acceptance / Efficiency Particle 2
10.17182/hepdata.83962.v1/t22
The parameterised efficiency for particles to pass full track selections in the metastable signal region, as function of the particle’s...
Acceptance / Efficiency Particle 3
10.17182/hepdata.83962.v1/t23
The parameterised efficiency for particles to pass full track selections in the metastable signal region, as function of the particle’s...
Acceptance / Efficiency Particle 4
10.17182/hepdata.83962.v1/t24
The parameterised efficiency for particles to pass full track selections in the metastable signal region, as function of the particle’s...
Acceptance / Efficiency Particle 5
10.17182/hepdata.83962.v1/t25
The parameterised efficiency for particles to pass full track selections in the metastable signal region, as function of the particle’s...
Acceptance / Efficiency Particle 6
10.17182/hepdata.83962.v1/t26
The parameterised efficiency for particles to pass full track selections in the metastable signal region, as function of the particle’s...
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When using this data, please cite the original publication:
ATLAS
Collaboration
(2019).
Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector. Phys.Lett.B 788 (2019) 96-116.
Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector. HEPData (collection).
https://doi.org/10.17182/hepdata.83962
or, if you prefer, a specific version of the
record:
ATLAS
Collaboration
(2018).
Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector (Version 1). HEPData (collection).
https://doi.org/10.17182/hepdata.83962.v1
You can also cite the 26 data
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Data tables
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ATLAS
Collaboration
(2018).
“Event Yields 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t1
ATLAS
Collaboration
(2018).
“Event Yields 2” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t2
ATLAS
Collaboration
(2018).
“Cutflow 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t3
ATLAS
Collaboration
(2018).
“Cross section UL 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t4
ATLAS
Collaboration
(2018).
“Cross section UL 2” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t5
ATLAS
Collaboration
(2018).
“Mass windows definition” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t6
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t7
ATLAS
Collaboration
(2018).
“SR plot 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t8
ATLAS
Collaboration
(2018).
“SR plot 2” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t9
ATLAS
Collaboration
(2018).
“UL Cross section 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t10
ATLAS
Collaboration
(2018).
“UL Cross section 2” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t11
ATLAS
Collaboration
(2018).
“Exclusion contour 1 (obs.)” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t12
ATLAS
Collaboration
(2018).
“Exclusion contour 1 (exp.)” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t13
ATLAS
Collaboration
(2018).
“UL Cross section 3” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t14
ATLAS
Collaboration
(2018).
“UL Cross section 4” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t15
ATLAS
Collaboration
(2018).
“UL Cross section 5” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t16
ATLAS
Collaboration
(2018).
“UL Cross section 6” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t17
ATLAS
Collaboration
(2018).
“Reconstructed Mass 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t18
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency MET 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t19
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency MET 2” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t20
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency Particle 1” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t21
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency Particle 2” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t22
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency Particle 3” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t23
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency Particle 4” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t24
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency Particle 5” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t25
ATLAS
Collaboration
(2018).
“Acceptance / Efficiency Particle 6” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.83962.v1/t26
Additional resources
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ATLAS
Collaboration
(2018).
“acceptance.C” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (other).
https://doi.org/10.17182/hepdata.83962.v1/r1
ATLAS
Collaboration
(2018).
“py6_setup_1600_10ns.dat” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (other).
https://doi.org/10.17182/hepdata.83962.v1/r2
ATLAS
Collaboration
(2018).
“py6_setup_1600_stable.dat” of “Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector” (Version 1). HEPData (other).
https://doi.org/10.17182/hepdata.83962.v1/r3
When using this data, please cite the original publication:
ATLAS
Collaboration
(2019).
Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the ATLAS detector. Phys.Lett.B 788 (2019) 96-116.
or, if you prefer, a specific version of the
record:
You can also cite the 26 data
tables
or the 3 additional
resources
individually.
Data tables
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Additional resources
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