CMS-SUS-19-001

CMS-SUS-19-001 ; CERN-EP-2023-186
Search for stealth supersymmetry in final states with two photons, jets, and low missing transverse momentum in proton-proton collisions at $ \sqrt{s}= $ 13 TeV
CMS Collaboration
5 October 2023
Accepted for publication in Phys. Rev. D
Abstract: The results of a search for stealth supersymmetry in final states with two photons and jets, targeting a phase space region with low missing transverse momentum ($ p_{\mathrm{T}}^\text{miss} $), are reported. The study is based on a sample of proton-proton collisions at $ \sqrt{s}= $ 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. As LHC results continue to constrain the parameter space of the minimal supersymmetric standard model, the low $ p_{\mathrm{T}}^\text{miss} $ regime is increasingly valuable to explore. To estimate the backgrounds due to standard model processes in such events, we apply corrections derived from simulation to an estimate based on a control selection in data. The results are interpreted in the context of simplified stealth supersymmetry models with gluino and squark pair production. The observed data are consistent with the standard model predictions, and gluino (squark) masses of up to 2150 (1850) GeV are excluded at the 95% confidence level.
Links: e-print arXiv:2310.03154 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Diagrams of the simplified models considered in this paper. The decay chain starts from the production of either gluino pairs (left) or squark pairs (right) and results in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $.
png pdf	Figure 1-a: Simplified model diagram for a decay chain starting from the production of a gluino pair and resulting in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $.
png pdf	Figure 1-b: Simplified model diagram for a decay chain starting from the production of a squark pair and resulting in a final state consisting of two photons, multiple jets, and low $ p_{\mathrm{T}}^\text{miss} $.
png pdf	Figure 2: The AGK template of the $ S_{\mathrm{T}} $ distribution, obtained with various values of $ \rho $, from the signal selection in data for $ N_{\text{jets}} = $ 2. The region shaded in yellow is the normalization sideband.
png pdf	Figure 3: Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for $ N_{\text{jets}} $ = 4 (upper), 5 (middle), and $ \geq $6 (lower). The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	Figure 3-a: Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for $ N_{\text{jets}} $ = 4. The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	Figure 3-b: Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for $ N_{\text{jets}} $ = 5. The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	Figure 3-c: Comparison of the measured $ S_{\mathrm{T}} $ distribution with the post-fit background prediction in each of the search regions of the analysis for $ N_{\text{jets}} $ = $ \geq $6. The post-fit uncertainties on the background prediction are represented by the yellow band around the central prediction. Signal yields at a signal strength of 1 are also overlaid for some representative points in the $ (m_{\mathrm{\tilde{g}}}(m_{\tilde{\mathrm{q}}}), m_{\tilde{\chi}_{1}^{0}}) $ parameter space.
png pdf	Figure 4: The 95% CL upper limits on the gluino pair production cross section (left) and squark pair production cross section (right) as functions of $ m_{\mathrm{\tilde{g}}} $ ($ m_{\tilde{\mathrm{q}}} $) and $ m_{\tilde{\chi}_{1}^{0}} $. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. Two standard deviation uncertainties are also shown for the expected 95% CL exclusions.
png pdf	Figure 4-a: The 95% CL upper limits on the gluino pair production cross section as functions of $ m_{\mathrm{\tilde{g}}} $ ($ m_{\tilde{\mathrm{q}}} $) and $ m_{\tilde{\chi}_{1}^{0}} $. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. Two standard deviation uncertainties are also shown for the expected 95% CL exclusions.
png pdf	Figure 4-b: The 95% CL upper limits on the squark pair production cross section as functions of $ m_{\mathrm{\tilde{g}}} $ ($ m_{\tilde{\mathrm{q}}} $) and $ m_{\tilde{\chi}_{1}^{0}} $. The contours show the observed (solid line) and expected (dashed line) 95% CL exclusions with their one standard deviation uncertainties. Two standard deviation uncertainties are also shown for the expected 95% CL exclusions.

Tables
png pdf	Table 1: Best fit values of $ A $ and $ m $ with statistical $ \pm $1$\sigma $ errors, obtained from the simulated background.

Summary

A search for stealth supersymmetry in events with two photons and at least four jets is presented. No threshold requirement on the missing transverse momentum is imposed. The measurement is based on a data sample corresponding to an integrated luminosity of 138 fb$ ^{-1} $ of proton-proton collisions at $ \sqrt{s} = $ 13 TeV recorded by the CMS experiment in 2016--2018. The analysis is performed in bins of $ S_{\mathrm{T}} $, which is the sum of transverse momenta for all reconstructed particles in the event, as well as jet multiplicity $ N_{\text{jets}} $. A background model based on control samples in data is employed to estimate the standard model (SM) background in the data. The data are found to be consistent with the SM background prediction with no evidence of significant signal contribution. The results of the search are interpreted as 95% confidence level upper limits on the gluino and squark production cross sections in the context of simplified models of stealth supersymmetry. In simplified stealth models with gluino (squark) pair production, we exclude gluino masses $ m_{\mathrm{\tilde{g}}} $ (squark masses $ m_{\tilde{\mathrm{q}}} $) up to 2150 (1850) GeV. These are the most stringent limits to date on these models.

References
1	G. R. Farrar and P. Fayet	Phenomenology of the production, decay, and detection of new hadronic states associated with supersymmetry	PLB 76 (1978) 575
2	S. Dimopoulos, G. F. Giudice, and A. Pomarol	Dark matter in theories of gauge mediated supersymmetry breaking	PLB 389 (1996) 37	hep-ph/9607225
3	S. P. Martin	Generalized messengers of supersymmetry breaking and the sparticle mass spectrum	PRD 55 (1997) 3177	hep-ph/9608224
4	E. Poppitz and S. P. Trivedi	Some remarks on gauge mediated supersymmetry breaking	PLB 401 (1997) 38	hep-ph/9703246
5	P. Meade, N. Seiberg, and D. Shih	General gauge mediation	Prog. Theor. Phys. Suppl. 177 (2009) 143	0801.3278
6	M. Buican, P. Meade, N. Seiberg, and D. Shih	Exploring general gauge mediation	JHEP 03 (2009) 016	0812.3668
7	S. Abel, M. J. Dolan, J. Jaeckel, and V. V. Khoze	Phenomenology of pure general gauge mediation	JHEP 12 (2009) 001	0910.2674
8	L. M. Carpenter, M. Dine, G. Festuccia, and J. D. Mason	Implementing general gauge mediation	PRD 79 (2009) 035002	0805.2944
9	T. T. Dumitrescu, Z. Komargodski, N. Seiberg, and D. Shih	General messenger gauge mediation	JHEP 05 (2010) 096	1003.2661
10	T. J. LeCompte and S. P. Martin	Large Hadron Collider reach for supersymmetric models with compressed mass spectra	PRD 84 (2011) 015004	1105.4304
11	T. J. LeCompte and S. P. Martin	Compressed supersymmetry after 1/fb at the Large Hadron Collider	PRD 85 (2012) 035023	1111.6897
12	R. Barbier et al.	$ R $-parity violating supersymmetry	Phys. Rept. 420 (2005) 1	hep-ph/0406039
13	P. W. Graham, S. Rajendran, and P. Saraswat	Supersymmetric crevices: Missing signatures of $ R $-parity violation at the LHC	PRD 90 (2014) 075005	1403.7197
14	M. J. Strassler and K. M. Zurek	Echoes of a hidden valley at hadron colliders	PLB 651 (2007) 374	hep-ph/0604261
15	T. Han, Z. Si, K. M. Zurek, and M. J. Strassler	Phenomenology of hidden valleys at hadron colliders	JHEP 07 (2008) 008	0712.2041
16	Y. Nakai, M. Reece, and R. Sato	SUSY Higgs mass and collider signals with a hidden valley	JHEP 03 (2016) 143	1511.00691
17	G. Burdman, Z. Chacko, H.-S. Goh, and R. Harnik	Folded supersymmetry and the LEP paradox	JHEP 02 (2007) 009	hep-ph/0609152
18	P. W. Graham, D. E. Kaplan, S. Rajendran, and P. Saraswat	Displaced supersymmetry	JHEP 07 (2012) 149	1204.6038
19	D. S. M. Alves, J. Liu, and N. Weiner	Hiding missing energy in missing energy	JHEP 04 (2015) 088	1312.4965
20	U. Ellwanger and A. M. Teixeira	NMSSM with a singlino LSP: possible challenges for searches for supersymmetry at the LHC	JHEP 10 (2014) 113	1406.7221
21	B. Heidenreich and Y. Nakai	Natural supersymmetry in warped space	JHEP 10 (2014) 182	1407.5095
22	CMS Collaboration	Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at $ \sqrt{s} = $ 13 TeV	JHEP 04 (2021) 123	CMS-SUS-20-001 2012.08600
23	CMS Collaboration	Search for supersymmetry in proton-proton collisions at $ \sqrt{s} = $ 13 TeV in events with high-momentum Z bosons and missing transverse momentum	JHEP 09 (2020) 149	CMS-SUS-19-013 2008.04422
24	CMS Collaboration	Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at $ \sqrt{s}= $ 13 TeV	EPJC 80 (2020) 752	CMS-SUS-19-008 2001.10086
25	CMS Collaboration	Search for supersymmetry in pp collisions at $ \sqrt{s}= $ 13 TeV with 137 fb$ ^{-1} $ in final states with a single lepton using the sum of masses of large-radius jets	PRD 101 (2020) 052010	CMS-SUS-19-007 1911.07558
26	CMS Collaboration	Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum	JHEP 10 (2019) 244	CMS-SUS-19-006 1908.04722
27	CMS Collaboration	Searches for physics beyond the standard model with the $ M_\mathrm{T2} $ variable in hadronic final states with and without disappearing tracks in proton-proton collisions at $ \sqrt{s}= $ 13 TeV	EPJC 80 (2020) 3	CMS-SUS-19-005 1909.03460
28	J. Fan, M. Reece, and J. T. Ruderman	Stealth supersymmetry	JHEP 11 (2011) 012	1105.5135
29	J. Fan, M. Reece, and J. T. Ruderman	A stealth supersymmetry sampler	JHEP 07 (2012) 196	1201.4875
30	J. Fan et al.	Stealth supersymmetry simplified	JHEP 07 (2016) 016	1512.05781
31	CMS Collaboration	Search for top squarks in final states with two top quarks and several light-flavor jets in proton-proton collisions at $ \sqrt {s} = $ 13 TeV	PRD 104 (2021) 032006	CMS-SUS-19-004 2102.06976
32	CMS Collaboration	Search for stealth supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV	PLB 743 (2015) 503	CMS-SUS-14-009 1411.7255
33	CMS Collaboration	HEPData record for this analysis	link
34	CMS Collaboration	The CMS experiment at the CERN LHC	JINST 3 (2008) S08004
35	J. Alwall et al.	The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations	JHEP 07 (2014) 079	1405.0301
36	R. Frederix et al.	The automation of next-to-leading order electroweak calculations	JHEP 07 (2018) 185	1804.10017
37	T. Sjöstrand et al.	An introduction to PYTHIA 8.2	Comput. Phys. Commun. 191 (2015) 159	1410.3012
38	CMS Collaboration	Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements	EPJC 80 (2020) 4	CMS-GEN-17-001 1903.12179
39	NNPDF Collaboration	Parton distributions from high-precision collider data	EPJC 77 (2017) 663	1706.00428
40	B. Fuks, M. Klasen, D. R. Lamprea, and M. Rothering	Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV	JHEP 10 (2012) 081	1207.2159
41	B. Fuks, M. Klasen, D. R. Lamprea, and M. Rothering	Precision predictions for electroweak superpartner production at hadron colliders with Resummino	EPJC 73 (2013) 2480	1304.0790
42	C. Borschensky et al.	Squark and gluino production cross sections in pp collisions at $ \sqrt{s} = $ 13, 14, 33 and 100 TeV	EPJC 74 (2014) 3174	1407.5066
43	W. Beenakker et al.	NNLL resummation for squark and gluino production at the LHC	JHEP 12 (2014) 023	1404.3134
44	W. Beenakker et al.	NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation	JHEP 12 (2016) 133	1607.07741
45	CMS Collaboration	The fast simulation of the CMS detector at LHC	J. Phys. Conf. Ser. 331 (2011) 032049
46	CMS Collaboration	Event generator tunes obtained from underlying event and multiparton scattering measurements	EPJC 76 (2016) 155	CMS-GEN-14-001 1512.00815
47	NNPDF Collaboration	Parton distributions with QED corrections	NPB 877 (2013) 290	1308.0598
48	Sherpa Collaboration	Event generation with Sherpa 2.2	SciPost Phys. 7 (2019) 034	1905.09127
49	H.-L. Lai et al.	New parton distributions for collider physics	PRD 82 (2010) 074024	1007.2241
50	A. Buckley et al.	LHAPDF6: parton density access in the LHC precision era	EPJC 75 (2015) 132	1412.7420
51	GEANT4 Collaboration	GEANT 4---a simulation toolkit	NIM A 506 (2003) 250
52	CMS Collaboration	Particle-flow reconstruction and global event description with the CMS detector	JINST 12 (2017) P10003	CMS-PRF-14-001 1706.04965
53	CMS Collaboration	Performance of the CMS Level-1 trigger in proton-proton collisions at $ \sqrt{s} = $ 13 TeV	JINST 15 (2020) P10017	CMS-TRG-17-001 2006.10165
54	CMS Collaboration	The CMS trigger system	JINST 12 (2017) P01020	CMS-TRG-12-001 1609.02366
55	M. Cacciari, G. P. Salam, and G. Soyez	The anti-$ k_{\mathrm{T}} $ jet clustering algorithm	JHEP 04 (2008) 063	0802.1189
56	M. Cacciari, G. P. Salam, and G. Soyez	FastJet user manual	EPJC 72 (2012) 1896	1111.6097
57	CMS Collaboration	Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV	JINST 12 (2017) P02014	CMS-JME-13-004 1607.03663
58	CMS Collaboration	Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC	JINST 16 (2021) P05014	CMS-EGM-17-001 2012.06888
59	CMS Collaboration	Performance of missing transverse momentum reconstruction in proton-proton collisions at $ \sqrt{s} = $ 13 TeV using the CMS detector	JINST 14 (2019) P07004	CMS-JME-17-001 1903.06078
60	CMS Collaboration	Search for microscopic black hole signatures at the Large Hadron Collider	PLB 697 (2011) 434	CMS-EXO-10-017 1012.3375
61	CMS Collaboration	Search for microscopic black holes in pp collisions at $ \sqrt{s}= $ 7 TeV	JHEP 04 (2012) 061	CMS-EXO-11-071 1202.6396
62	CMS Collaboration	Search for microscopic black holes in pp collisions at $ \sqrt{s} = $ 8 TeV	JHEP 07 (2013) 178	CMS-EXO-12-009 1303.5338
63	CMS Collaboration	Search for black holes in high-multiplicity final states in proton-proton collisions at $ \sqrt{s} = $ 13 TeV	PLB 774 (2017) 279	CMS-EXO-15-007 1705.01403
64	K. S. Cranmer	Kernel estimation in high-energy physics	Comput. Phys. Commun. 136 (2001) 198	hep-ex/0011057
65	CMS Collaboration	Precision luminosity measurement in proton-proton collisions at $ \sqrt{s} = $ 13 TeV in 2015 and 2016 at CMS	EPJC 81 (2021) 800	CMS-LUM-17-003 2104.01927
66	CMS Collaboration	CMS luminosity measurement for the 2017 data-taking period at $ \sqrt{s}= $ 13 TeV	CMS Physics Analysis Summary, 2018 CMS-PAS-LUM-17-004	CMS-PAS-LUM-17-004
67	CMS Collaboration	CMS luminosity measurement for the 2018 data-taking period at $ \sqrt{s}= $ 13 TeV	CMS Physics Analysis Summary, 2019 CMS-PAS-LUM-18-002	CMS-PAS-LUM-18-002
68	T. Junk	Confidence level computation for combining searches with small statistics	NIM A 434 (1999) 435	hep-ex/9902006
69	A. L. Read	Presentation of search results: The $ \mathrm{CL}_{\mathrm{s}} $ technique	JPG 28 (2002) 2693
70	ATLAS and CMS Collaborations, and the LHC Higgs Combination Group	Procedure for the LHC Higgs boson search combination in summer 2011	Technical Report ATL-PHYS-PUB-2011-11 and CMS-NOTE-2011-005, 2011
71	G. Cowan, K. Cranmer, E. Gross, and O. Vitells	Asymptotic formulae for likelihood-based tests of new physics	EPJC 71 (2011) 1554	1007.1727