Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limits. The mass splitting between the two dark matter particles χ_{1} and χ_{2}, with m(χ_{2})>m(χ_{1}), is induced by a dark Higgs field and a corresponding dark Higgs boson h^{'}. We present a search for dark matter in events with two vertices, at least one of which must be displaced from the interaction region, and missing energy. Using a 365 fb^{-1} data sample collected at Belle II, which operates at the SuperKEKB e^{+}e^{-} collider, we observe no evidence for a signal. We set upper limits on the product of the production cross section σ(e^{+}e^{-}→h^{'}χ_{1}χ_{2}), and the product of branching fractions B(χ_{2}→χ_{1}e^{+}e^{-})×B(h^{'}→x^{+}x^{-}), where x^{+}x^{-} indicates μ^{+}μ^{-},π^{+}π^{-}, or K^{+}K^{-}, as functions of h^{'} mass and lifetime at the level of 10^{-1} fb. We set model-dependent upper limits on the dark Higgs mixing angle at the level of 10^{-5} and on the dark photon kinetic mixing parameter at the level of 10^{-3}. This is the first search for dark Higgs bosons in association with inelastic dark matter.

Authors

K. Ravindran (ORCID: https://orcid.org/0000-0002-5584-2614)
J. Schmitz (ORCID: https://orcid.org/0000-0001-8274-8124)
E.-J. Jang (ORCID: https://orcid.org/0000-0002-1935-9887)
T. Lam (ORCID: https://orcid.org/0000-0001-9128-6806)
K. Kinoshita (ORCID: https://orcid.org/0000-0001-7175-4182)
H. Atmacan (ORCID: https://orcid.org/0000-0003-2435-501X)
S. Bansal (ORCID: https://orcid.org/0000-0003-1992-0336)
C. Cecchi (ORCID: https://orcid.org/0000-0002-2192-8233)
T. E. Browder (ORCID: https://orcid.org/0000-0001-7357-9007)
S. P. Maharana (ORCID: https://orcid.org/0000-0002-1746-4683)
P. Ecker (ORCID: https://orcid.org/0000-0002-6817-6868)
S. Pardi (ORCID: https://orcid.org/0000-0001-7994-0537)
Y. Onuki (ORCID: https://orcid.org/0000-0002-1646-6847)
G. Dujany (ORCID: https://orcid.org/0000-0002-1345-8163)
Z. Gruberová (ORCID: https://orcid.org/0000-0002-5691-1044)
S.-J. Cho (ORCID: https://orcid.org/0000-0002-1673-5664)
R. Leboucher (ORCID: https://orcid.org/0000-0003-3097-6613)
C. H. Kim (ORCID: https://orcid.org/0000-0002-5743-7698)
S. Pokharel (ORCID: https://orcid.org/0000-0002-3367-738X)
D. Ricalde Herrmann (ORCID: https://orcid.org/0000-0001-9772-9989)
M. Alhakami (ORCID: https://orcid.org/0000-0002-2234-8628)
M. Bartl
S. Longo (ORCID: https://orcid.org/0000-0002-8124-8969)
J. S. Lange (ORCID: https://orcid.org/0000-0003-0234-0474)
M. Garcia-Hernandez (ORCID: https://orcid.org/0000-0003-2393-3367)
C. Schwanda (ORCID: https://orcid.org/0000-0003-4844-5028)
T. Iijima (ORCID: https://orcid.org/0000-0002-4271-711X)
W. C. Yan (ORCID: https://orcid.org/0000-0001-6721-9435)
G. Mancinelli (ORCID: https://orcid.org/0000-0003-1144-3678)
R. Volpe (ORCID: https://orcid.org/0000-0003-1782-2978)
J. Libby (ORCID: https://orcid.org/0000-0002-1219-3247)
S. Marcello (ORCID: https://orcid.org/0000-0003-4144-863X)
M. Maggiora (ORCID: https://orcid.org/0000-0003-4143-9127)
K. Kumara (ORCID: https://orcid.org/0000-0003-1572-5365)
W. Gradl (ORCID: https://orcid.org/0000-0002-9974-8320)
G. Gaudino (ORCID: https://orcid.org/0000-0001-5983-1552)
M. Neu (ORCID: https://orcid.org/0000-0002-4564-8009)
R. Mizuk (ORCID: https://orcid.org/0000-0002-2209-6969)
D. Marcantonio (ORCID: https://orcid.org/0000-0002-1315-8646)
Y.-J. Kwon (ORCID: https://orcid.org/0000-0001-9448-5691)
Y. B. Li (ORCID: https://orcid.org/0000-0002-9909-2851)
S. Patra (ORCID: https://orcid.org/0000-0002-4114-1091)
S. A. Al‐Ghamdi (ORCID: https://orcid.org/0000-0001-7609-112X)
K. Parham (ORCID: https://orcid.org/0000-0001-9556-2433)
M. Watanabe (ORCID: https://orcid.org/0000-0001-6917-6694)
N. K. Baghel (ORCID: https://orcid.org/0009-0008-7806-4422)
H. Ghumaryan (ORCID: https://orcid.org/0000-0001-6775-8893)
Н. Акопов (ORCID: https://orcid.org/0000-0002-4425-2096)
S.-H. Park (ORCID: https://orcid.org/0000-0001-6019-6218)
A. L. Moreira De Carvalho (ORCID: https://orcid.org/0000-0002-1986-5720)
Y. Han (ORCID: https://orcid.org/0000-0001-6775-5932)
G. Raeuber (ORCID: https://orcid.org/0000-0003-2948-5155)
Y. Nakazawa (ORCID: https://orcid.org/0000-0002-6271-5808)
S. Paul (ORCID: https://orcid.org/0000-0002-8813-0437)
M. E. Sevior (ORCID: https://orcid.org/0000-0002-4824-101X)
J. Kandra (ORCID: https://orcid.org/0000-0001-5635-1000)
B. Paschen (ORCID: https://orcid.org/0000-0003-1546-4548)
A. Ishikawa (ORCID: https://orcid.org/0000-0002-3561-5633)
Shoichi Watanuki (ORCID: https://orcid.org/0000-0002-5241-6628)
Y. Jin (ORCID: https://orcid.org/0000-0002-7323-0830)
T. Higuchi (ORCID: https://orcid.org/0000-0002-7761-3505)
W. M. Song (ORCID: https://orcid.org/0000-0003-1376-2293)
E. Graziani (ORCID: https://orcid.org/0000-0001-8602-5652)
J. V. Bennett (ORCID: https://orcid.org/0000-0002-5440-2668)
H. Svidras (ORCID: https://orcid.org/0000-0003-4198-2517)
A. Sokolov (ORCID: https://orcid.org/0000-0002-9420-0091)
G. Sharma (ORCID: https://orcid.org/0000-0002-5620-5334)
A. Soffer
S. Moneta (ORCID: https://orcid.org/0000-0003-2184-7510)
S. Hazra (ORCID: https://orcid.org/0000-0001-6954-9593)
B. G. Cheon (ORCID: https://orcid.org/0000-0002-8803-4429)
M. Starič (ORCID: https://orcid.org/0000-0001-8751-5944)
K. Chirapatpimol (ORCID: https://orcid.org/0000-0003-2099-7760)
C. Ketter (ORCID: https://orcid.org/0000-0002-5161-9722)
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M. Masuda (ORCID: https://orcid.org/0000-0002-7109-5583)
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P. Cheema (ORCID: https://orcid.org/0000-0001-8472-5727)
H. Miyake (ORCID: https://orcid.org/0000-0002-7079-8236)
A. Beaubien (ORCID: https://orcid.org/0000-0001-9438-089X)
R. Peschke (ORCID: https://orcid.org/0000-0002-2529-8515)
B. Shwartz (ORCID: https://orcid.org/0000-0002-1456-1496)
M. Röhrken (ORCID: https://orcid.org/0000-0003-0654-2866)
A. Natochii (ORCID: https://orcid.org/0000-0002-1076-814X)
U. Tamponi (ORCID: https://orcid.org/0000-0001-6651-0706)
S. Yamada (ORCID: https://orcid.org/0000-0002-8858-9336)
L. Aggarwal (ORCID: https://orcid.org/0000-0002-0909-7537)
Jürgen Becker (ORCID: https://orcid.org/0000-0002-5082-5487)
S. Bussino (ORCID: https://orcid.org/0000-0002-3829-9592)
A. Baur (ORCID: https://orcid.org/0000-0003-1360-3292)
T. Martinov (ORCID: https://orcid.org/0000-0001-7846-1913)
T. Kuhr (ORCID: https://orcid.org/0000-0001-6251-8049)
T. K. Pedlar (ORCID: https://orcid.org/0000-0001-9839-7373)
S. Mondal (ORCID: https://orcid.org/0000-0002-3054-8400)
F. Keil (ORCID: https://orcid.org/0000-0002-7278-2860)
S. Mitra (ORCID: https://orcid.org/0000-0002-1118-6344)
T. Bilka (ORCID: https://orcid.org/0000-0003-1449-6986)
M. Sobotzik (ORCID: https://orcid.org/0000-0002-1773-5455)
S. Stefkova (ORCID: https://orcid.org/0000-0003-2628-530X)
S. Korpar (ORCID: https://orcid.org/0000-0003-0971-0968)
R. Itoh (ORCID: https://orcid.org/0000-0003-1590-0266)
C. Praz (ORCID: https://orcid.org/0000-0002-6154-885X)
M. Mirra (ORCID: https://orcid.org/0000-0002-1190-2961)
C. Sfienti
K. Miyabayashi (ORCID: https://orcid.org/0000-0003-4352-734X)
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P. L. M. Podesta-Lerma (ORCID: https://orcid.org/0000-0002-8152-9605)
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K. Park (ORCID: https://orcid.org/0000-0003-0567-3493)
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T. Kunigo (ORCID: https://orcid.org/0000-0001-9613-2849)
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P. Gironella Gironell (ORCID: https://orcid.org/0000-0001-5603-4750)
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A. Bobrov (ORCID: https://orcid.org/0000-0001-5735-8386)
M. Laurenza (ORCID: https://orcid.org/0000-0002-7400-6013)
S. Bettarini (ORCID: https://orcid.org/0000-0001-7742-2998)
P. Jackson (ORCID: https://orcid.org/0000-0002-0847-402X)
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M. Piccolo (ORCID: https://orcid.org/0000-0001-9750-0551)
S. Lin (ORCID: https://orcid.org/0000-0001-5922-9561)
M. Angelsmark (ORCID: https://orcid.org/0000-0003-4745-1020)
J. Cochran (ORCID: https://orcid.org/0000-0002-1492-914X)
M. Wakai (ORCID: https://orcid.org/0000-0003-2818-3155)
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K. Matsuoka (ORCID: https://orcid.org/0000-0003-1706-9365)
I. Adachi (ORCID: https://orcid.org/0000-0003-2287-0173)
D. A. Sanders (ORCID: https://orcid.org/0000-0002-4902-966X)
A. Rostomyan (ORCID: https://orcid.org/0000-0003-1839-8152)
G. Rizzo (ORCID: https://orcid.org/0000-0003-1788-2866)
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D. Bodrov (ORCID: https://orcid.org/0000-0001-5279-4787)
T. Shimasaki (ORCID: https://orcid.org/0000-0003-3291-9532)
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S. Raiz (ORCID: https://orcid.org/0000-0001-7010-8066)
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M. Takahashi (ORCID: https://orcid.org/0000-0003-1171-5960)
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Q. P. Ji (ORCID: https://orcid.org/0000-0003-2963-2565)
A. E. Bolz (ORCID: https://orcid.org/0000-0002-4033-9223)
C.-L. Hsu (ORCID: https://orcid.org/0000-0002-1641-430X)
P. Leo (ORCID: https://orcid.org/0000-0003-3833-2900)
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I. M. Peruzzi (ORCID: https://orcid.org/0000-0001-6729-8436)
D. M. Asner (ORCID: https://orcid.org/0000-0002-1586-5790)
G. Giakoustidis (ORCID: https://orcid.org/0000-0001-5982-1784)
J.-G. Shiu
S. Prell (ORCID: https://orcid.org/0000-0002-0195-8005)
J. Strube (ORCID: https://orcid.org/0000-0001-7470-9301)
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M. Hoek (ORCID: https://orcid.org/0000-0002-1893-8764)
P. Feichtinger (ORCID: https://orcid.org/0000-0003-3966-7497)
K.-H. Kim (ORCID: https://orcid.org/0000-0002-4659-1112)
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D. Dossett (ORCID: https://orcid.org/0000-0002-5670-5582)
M. Barrett (ORCID: https://orcid.org/0000-0002-2095-603X)
M. Campajola (ORCID: https://orcid.org/0000-0003-2518-7134)
A. Kuzmin (ORCID: https://orcid.org/0000-0002-7011-5044)
I. Ripp-Baudot (ORCID: https://orcid.org/0000-0002-1897-8272)
J. Dingfelder (ORCID: https://orcid.org/0000-0001-5767-2121)
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R. de Sangro (ORCID: https://orcid.org/0000-0002-3808-5455)
K. R. Amos (ORCID: https://orcid.org/0000-0003-1757-5620)
K. Chilikin (ORCID: https://orcid.org/0000-0001-7620-2053)
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C. Hearty (ORCID: https://orcid.org/0000-0001-6568-0252)
S. Lacaprara (ORCID: https://orcid.org/0000-0002-0551-7696)
I. Tsaklidis (ORCID: https://orcid.org/0000-0003-3584-4484)
M. Schnepf (ORCID: https://orcid.org/0000-0003-0623-0184)
M. Nayak (ORCID: https://orcid.org/0000-0002-2572-4692)
R. Giordano (ORCID: https://orcid.org/0000-0002-5496-7247)
A. Martens (ORCID: https://orcid.org/0000-0003-1544-4053)
P. Stavroulakis (ORCID: https://orcid.org/0000-0001-9914-7261)
S. Dey (ORCID: https://orcid.org/0000-0003-2997-3829)
G. Ghevondyan (ORCID: https://orcid.org/0000-0003-0096-3555)
T. V. Dong (ORCID: https://orcid.org/0000-0003-3043-1939)
B. Bhuyan (ORCID: https://orcid.org/0000-0001-6254-3594)
I. Ueda (ORCID: https://orcid.org/0000-0002-6833-4344)
M. Destefanis (ORCID: https://orcid.org/0000-0003-1997-6751)
K. E. Varvell (ORCID: https://orcid.org/0000-0003-1017-1295)
A. Boschetti (ORCID: https://orcid.org/0000-0001-6030-3087)
M. Reif (ORCID: https://orcid.org/0000-0002-0706-0247)
E. Kovalenko (ORCID: https://orcid.org/0000-0001-8084-1931)
K. Kojima (ORCID: https://orcid.org/0000-0002-3638-0266)
M. Hernández Villanueva (ORCID: https://orcid.org/0000-0002-6322-5587)
V. Vobbilisetti (ORCID: https://orcid.org/0000-0002-4399-5082)
S. Choudhury (ORCID: https://orcid.org/0000-0001-9841-0216)
T. Shillington (ORCID: https://orcid.org/0000-0003-3862-4380)
Y. Unno (ORCID: https://orcid.org/0000-0003-3355-765X)
Q. M. Li (ORCID: https://orcid.org/0009-0004-9425-2678)
D. Shtol (ORCID: https://orcid.org/0000-0002-0622-6065)
L. Cao (ORCID: https://orcid.org/0000-0001-8332-5668)
S. Bahinipati (ORCID: https://orcid.org/0000-0002-3744-5332)
R. Tiwary (ORCID: https://orcid.org/0000-0002-5887-1883)
J. Serrano (ORCID: https://orcid.org/0000-0003-2489-7812)
C. Miller (ORCID: https://orcid.org/0000-0003-2631-1790)
X. P. Xu (ORCID: https://orcid.org/0000-0001-5096-1182)
P. Rados (ORCID: https://orcid.org/0000-0003-0690-8100)
G. Finocchiaro (ORCID: https://orcid.org/0000-0002-3936-2151)
M. Takizawa (ORCID: https://orcid.org/0000-0001-8225-3973)
M. Nayak (ORCID: https://orcid.org/0000-0002-9434-6197)
M. Sumihama (ORCID: https://orcid.org/0000-0002-8954-0585)
K. Uno (ORCID: https://orcid.org/0000-0002-2209-8198)
A. Vinokurova (ORCID: https://orcid.org/0000-0003-4220-8056)
W. W. Jacobs (ORCID: https://orcid.org/0000-0002-9996-6336)
M. Iwasaki
A. Fodor (ORCID: https://orcid.org/0000-0002-2821-759X)
Y.B Li (ORCID: https://orcid.org/0009-0002-8040-2546)
M. Naruki (ORCID: https://orcid.org/0000-0003-1773-2999)
C. Kiesling (ORCID: https://orcid.org/0000-0002-2209-535X)
Kiyoshi Tanida (ORCID: https://orcid.org/0000-0002-8255-3746)
H. J. Li (ORCID: https://orcid.org/0000-0001-9275-4739)
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I. Nakamura (ORCID: https://orcid.org/0000-0002-7640-5456)
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M.-C. Chang (ORCID: https://orcid.org/0000-0002-8650-6058)
L. Vitale (ORCID: https://orcid.org/0000-0003-3354-2300)
R. Mussa (ORCID: https://orcid.org/0000-0003-3579-9951)
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H. Purwar (ORCID: https://orcid.org/0000-0002-3876-7069)
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O. Tittel (ORCID: https://orcid.org/0000-0001-9128-6240)
L. Reuter (ORCID: https://orcid.org/0000-0002-5930-6237)
J. S. Zhou (ORCID: https://orcid.org/0000-0002-6413-4687)
J. H. Yin (ORCID: https://orcid.org/0000-0002-1479-9349)
M. T. Hedges (ORCID: https://orcid.org/0000-0001-6504-1872)
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F. U. Bernlochner (ORCID: https://orcid.org/0000-0001-8153-2719)
J.-Y. Kim (ORCID: https://orcid.org/0000-0001-7593-843X)
N. Ipsita (ORCID: https://orcid.org/0000-0002-2927-3366)
M. Bračko (ORCID: https://orcid.org/0000-0002-2495-0524)
R. Garg
N. Rout (ORCID: https://orcid.org/0000-0002-4310-3638)
L. Zani (ORCID: https://orcid.org/0000-0003-4957-805X)
V. S. Vismaya (ORCID: https://orcid.org/0000-0002-1606-5349)
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T. Koga (ORCID: https://orcid.org/0000-0002-1644-2001)
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S. Spataro (ORCID: https://orcid.org/0000-0001-9601-405X)
V. Savinov (ORCID: https://orcid.org/0000-0002-9184-2830)
F. Becherer (ORCID: https://orcid.org/0000-0003-0562-4616)
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A. Gaz (ORCID: https://orcid.org/0000-0001-6754-3315)
I. Haide (ORCID: https://orcid.org/0000-0003-0962-6344)
P. Ecker (ORCID: https://orcid.org/0000-0001-8368-3721)
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S. Privalov (ORCID: https://orcid.org/0009-0004-1681-3919)
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Zhiqing Liu (ORCID: https://orcid.org/0000-0002-0290-3022)
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E. Torassa (ORCID: https://orcid.org/0000-0003-2321-0599)
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L. Zhu (ORCID: https://orcid.org/0009-0007-1127-5818)
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S. B. Yang (ORCID: https://orcid.org/0000-0002-9543-7971)
X. Shi (ORCID: https://orcid.org/0000-0002-7006-6107)
F. Zeng (ORCID: https://orcid.org/0009-0003-6474-3508)
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Y. Sue (ORCID: https://orcid.org/0000-0003-2430-8707)
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E. Manoni (ORCID: https://orcid.org/0000-0002-9826-7947)
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R. Žlebčík (ORCID: https://orcid.org/0000-0003-1644-8523)
L. Lanceri (ORCID: https://orcid.org/0000-0001-8220-3095)
K. Yoshihara (ORCID: https://orcid.org/0000-0002-3656-2326)
T. S. Lau (ORCID: https://orcid.org/0000-0001-7110-7823)
K. Sumisawa (ORCID: https://orcid.org/0000-0001-7003-7210)
A. Gale (ORCID: https://orcid.org/0009-0005-2634-7189)
S. Banerjee (ORCID: https://orcid.org/0000-0001-8852-2409)
J. U. Rehman (ORCID: https://orcid.org/0000-0002-2673-1982)
R. HOPPE (ORCID: https://orcid.org/0009-0005-8881-8935)
H.-E. Cho (ORCID: https://orcid.org/0000-0002-7008-3759)
A. Bożek (ORCID: https://orcid.org/0000-0002-5915-1319)
K. Trabelsi (ORCID: https://orcid.org/0000-0001-6567-3036)
N. Suwonjandee (ORCID: https://orcid.org/0009-0000-2819-5020)
G. Pakhlova (ORCID: https://orcid.org/0000-0001-7518-3022)
S. Vahsen (ORCID: https://orcid.org/0000-0003-1685-9824)
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Z. Natkaniec (ORCID: https://orcid.org/0000-0003-0486-9291)
R. Stroili (ORCID: https://orcid.org/0000-0002-3453-142X)
J. M. Roney (ORCID: https://orcid.org/0000-0001-7802-4617)
P. Križan (ORCID: https://orcid.org/0000-0002-4967-7675)
M. Maushart (ORCID: https://orcid.org/0009-0004-1020-7299)
C. Madaan (ORCID: https://orcid.org/0009-0004-1205-5700)
Yue Ma (ORCID: https://orcid.org/0000-0001-8412-8308)
S. H. Robertson (ORCID: https://orcid.org/0000-0003-4096-8393)
C. Antonioli (ORCID: https://orcid.org/0009-0003-9088-3811)
I. Consigny (ORCID: https://orcid.org/0009-0009-8755-6290)
L. Salutari (ORCID: https://orcid.org/0009-0001-2822-6939)

Institutions

University of Hawaiʻi at Mānoa (US)
University of Hawaii System (US)
High Energy Accelerator Research Organization (JP)
Centre de physique des particules de Marseille (FR)
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR)
The University of Osaka (JP)

Publication Details

Journal: Physical Review Letters
Published: 2025-09-22
DOI: https://doi.org/10.1103/37w5-glpp
Citations: 1
Primary Topic: Dark Matter and Cosmic Phenomena
Type: article
Field-Weighted Citation Impact: 1.87

Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Authors

Institutions

Publication Details

Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment

Abstract

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