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Search for decays of stopped exotic long-lived particles produced in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The collaboration
JHEP, 2017

Abstract
A search is presented for the decays of heavy exotic long-lived particles (LLPs) that are produced in proton-proton collisions at a center-of-mass energy of 13\TeV at the CERN LHC and come to rest in the CMS detector. Their decays would be visible during periods of time well separated from proton-proton collisions. Two decay scenarios of stopped LLPs are explored: a hadronic decay detected in the calorimeter and a decay into muons detected in the muon system. The calorimeter (muon) search covers a period of sensitivity totaling 721 (744) hours in 38.6 (39.0) fb$^{-1}$ of data collected by the CMS detector in 2015 and 2016. The results are interpreted in several scenarios that predict LLPs. Production cross section limits are set as a function of the mean proper lifetime and the mass of the LLPs, for lifetimes between 100 ns and 10 days. These are the most stringent limits to date on the mass of hadronically decaying stopped LLPs, and this is the first search at the LHC for stopped LLPs that decay to muons.

• #### Table 1

Data from Figure 1 (left).

10.17182/hepdata.83010.v1/t1

The $\Delta t_{\text{DT}}$ distribution for 2016 data, MC simulated cosmic ray muon, 1000 GeV gluino signal, and 600 GeV MCHAMP...

• #### Table 2

Data from Figure 1 (right).

10.17182/hepdata.83010.v1/t2

The $\Delta t_{\text{RPC}}$ distribution for 2016 data, MC simulated cosmic ray muon, 1000 GeV gluino signal, and 600 GeV MCHAMP...

• #### Table 3

Data from Figure 2 (left).

10.17182/hepdata.83010.v1/t3

The $\varepsilon_{\text{reco}}$ values as a function of $E_{g}$, for $\tilde{g}$ R-hadrons that stop in the EB or HB, in the...

• #### Table 4

Data from Figure 2 (left).

10.17182/hepdata.83010.v1/t4

The $\varepsilon_{\text{reco}}$ values as a function of $E_{g}$, for $\tilde{g}$ R-hadrons that stop in the EB or HB, in the...

• #### Table 5

Data from Figure 2 (left).

10.17182/hepdata.83010.v1/t5

The $\varepsilon_{\text{reco}}$ values as a function of $E_{g}$, for $\tilde{g}$ R-hadrons that stop in the EB or HB, in the...

• #### Table 6

Data from Figure 2 (left).

10.17182/hepdata.83010.v1/t6

The $\varepsilon_{\text{reco}}$ values as a function of $E_{t}$, for $\tilde{t}$ R-hadrons that stop in the EB or HB, in the...

• #### Table 7

Data from Figure 2 (left).

10.17182/hepdata.83010.v1/t7

The $\varepsilon_{\text{reco}}$ values as a function of $E_{t}$, for $\tilde{t}$ R-hadrons that stop in the EB or HB, in the...

• #### Table 8

Data from Figure 2 (left).

10.17182/hepdata.83010.v1/t8

The $\varepsilon_{\text{reco}}$ values as a function of $E_{t}$, for $\tilde{t}$ R-hadrons that stop in the EB or HB, in the...

• #### Table 9

Data from Figure 2 (right).

10.17182/hepdata.83010.v1/t9

The $\varepsilon_{\text{reco}}$ values as a function of $m_{\tilde{g}} - m_{\tilde{\chi}^{0}}$, for $\tilde{g}$ R-hadrons that stop in the EB or HB,...

• #### Table 10

Data from Figure 2 (right).

10.17182/hepdata.83010.v1/t10

The $\varepsilon_{\text{reco}}$ values as a function of $m_{\tilde{g}} - m_{\tilde{\chi}^{0}}$, for $\tilde{g}$ R-hadrons that stop in the EB or HB,...

• #### Table 11

Data from Figure 3.

10.17182/hepdata.83010.v1/t11

The background extrapolation for the muon search. The integral of the fit function to $\Delta t_{DT}$ with the sum of...

• #### Table 12

Data from Figure 4 (upper left).

10.17182/hepdata.83010.v1/t12

The 95% CL upper limits on $\mathcal{B}\sigma$ for gluino pair production, using the cloud model of R-hadron interactions, as a...

• #### Table 13

Data from Figure 4 (upper right).

10.17182/hepdata.83010.v1/t13

The 95% CL upper limits on $\mathcal{B}\sigma$ for top squark pair production, using the cloud model of R-hadron interactions, as...

• #### Table 14

Data from Figure 4 (lower middle).

10.17182/hepdata.83010.v1/t14

The 95% CL upper limits on $\mathcal{B}\sigma$ for gluino pair production, using the cloud model of R-hadron interactions, as a...

• #### Table 15

Data from Figure 5 (left).

10.17182/hepdata.83010.v1/t15

The 95% CL upper limits on the gluino mass, using the cloud model of R-hadron interactions, as a function of...

• #### Table 16

Data from Figure 5 (left).

10.17182/hepdata.83010.v1/t16

The 95% CL upper limits on the top squark mass, using the cloud model of R-hadron interactions, as a function...

• #### Table 17

Data from Figure 5 (right).

10.17182/hepdata.83010.v1/t17

The 95% CL upper limits on the gluino mass, using the cloud model of R-hadron interactions, as a function of...

• #### Table 18

Data from Figure 6 (upper left).

10.17182/hepdata.83010.v1/t18

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 19

Data from Figure 6 (upper left).

10.17182/hepdata.83010.v1/t19

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 20

Data from Figure 6 (upper left).

10.17182/hepdata.83010.v1/t20

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 21

Data from Figure 6 (upper left).

10.17182/hepdata.83010.v1/t21

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 22

Data from Figure 6 (upper right).

10.17182/hepdata.83010.v1/t22

The 95% CL upper limits in the neutralino mass vs.~top squark mass plane, for lifetimes between 10 $\mu$s and 1000...

• #### Table 23

Data from Figure 6 (upper right).

10.17182/hepdata.83010.v1/t23

The 95% CL upper limits in the neutralino mass vs.~top squark mass plane, for lifetimes between 10 $\mu$s and 1000...

• #### Table 24

Data from Figure 6 (upper right).

10.17182/hepdata.83010.v1/t24

The 95% CL upper limits in the neutralino mass vs.~top squark mass plane, for lifetimes between 10 $\mu$s and 1000...

• #### Table 25

Data from Figure 6 (upper right).

10.17182/hepdata.83010.v1/t25

The 95% CL upper limits in the neutralino mass vs.~top squark mass plane, for lifetimes between 10 $\mu$s and 1000...

• #### Table 26

Data from Figure 6 (lower).

10.17182/hepdata.83010.v1/t26

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 27

Data from Figure 6 (lower).

10.17182/hepdata.83010.v1/t27

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 28

Data from Figure 6 (lower).

10.17182/hepdata.83010.v1/t28

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 29

Data from Figure 6 (lower).

10.17182/hepdata.83010.v1/t29

The 95% CL upper limits in the neutralino mass vs.~gluino mass plane, for lifetimes between 10 $\mu$s and 1000 s,...

• #### Table 30

Data from Figure 7 (left).

10.17182/hepdata.83010.v1/t30

The 95% CL upper limits on $\mathcal{B}\sigma$ for 1000 GeV gluino pair production as a function of lifetime, for combined...

• #### Table 31

Data from Figure 7 (right).

10.17182/hepdata.83010.v1/t31

The 95% CL upper limits on $\mathcal{B}\sigma$ for 400 GeV MCHAMP pair production as a function of lifetime, for combined...

• #### Table 32

Data from Figure 8 (left).

10.17182/hepdata.83010.v1/t32

95% CL upper limits on $\mathcal{B}\sigma$ for gluino pair production as a function of mass, for lifetimes between 10 $\mu$s...

• #### Table 33

Data from Figure 8 (right).

10.17182/hepdata.83010.v1/t33

95% CL upper limits on $\mathcal{B}\sigma$ for MCHAMP pair production as a function of mass, for lifetimes between 10 $\mu$s...