Search for Axionlike Particles Produced in e^{+}e^{-} Collisions at Belle II. F Abudinén , I Adachi , H Aihara , N Akopov , A Aloisio , F Ameli , N Anh Ky , D M Asner , T Aushev , V Aushev , V Babu , S Baehr , S Bahinipati , P Bambade , Sw Banerjee , S Bansal , J Baudot , J Becker , P K Behera , J V Bennett , E Bernieri , F U Bernlochner , M Bertemes , M Bessner , S Bettarini , V Bhardwaj , F Bianchi , T Bilka , S Bilokin , D Biswas , M Bračko , P Branchini , N Braun , T E Browder , A Budano , S Bussino , M Campajola , G Casarosa , C Cecchi , D Červenkov , M-C Chang , P Chang , R Cheaib , V Chekelian , B G Cheon , K Chilikin , K Chirapatpimol , H-E Cho , K Cho , S-J Cho , S-K Choi , D Cinabro , L Corona , L M Cremaldi , S Cunliffe , N Dash , F Dattola , E De La Cruz-Burelo , G De Nardo , M De Nuccio , G De Pietro , R de Sangro , M Destefanis , A De Yta-Hernandez , F Di Capua , Z Doležal , T V Dong , K Dort , D Dossett , G Dujany , S Eidelman , T Ferber , D Ferlewicz , S Fiore , A Fodor , F Forti , B G Fulsom , E Ganiev , R Garg , A Garmash , V Gaur , A Gaz , U Gebauer , A Gellrich , T Geßler , R Giordano , A Giri , B Gobbo , R Godang , P Goldenzweig , B Golob , P Gomis , W Gradl , E Graziani , D Greenwald , C Hadjivasiliou , S Halder , O Hartbrich , K Hayasaka , H Hayashii , C Hearty , M T Hedges , I Heredia de la Cruz , M Hernández Villanueva , A Hershenhorn , T Higuchi , E C Hill , H Hirata , M Hoek , M Hohmann , C-L Hsu , Y Hu , K Inami , G Inguglia , J Irakkathil Jabbar , A Ishikawa , R Itoh , P Jackson , W W Jacobs , D E Jaffe , E-J Jang , S Jia , Y Jin , C Joo , A B Kaliyar , J Kandra , G Karyan , Y Kato , H Kichimi , C Kiesling , C-H Kim , D Y Kim , H J Kim , S-H Kim , Y-K Kim , T D Kimmel , K Kinoshita , C Kleinwort , P Kodyš , T Koga , S Kohani , I Komarov , S Korpar , T M G Kraetzschmar , P Križan , P Krokovny , T Kuhr , M Kumar , R Kumar , K Kumara , S Kurz , Y-J Kwon , S Lacaprara , C La Licata , L Lanceri , J S Lange , I-S Lee , S C Lee , P Leitl , D Levit , P M Lewis , C Li , L K Li , Y B Li , J Libby , K Lieret , L Li Gioi , Z Liptak , Q Y Liu , D Liventsev , S Longo , T Luo , C MacQueen , Y Maeda , R Manfredi , E Manoni , S Marcello , C Marinas , A Martini , M Masuda , K Matsuoka , D Matvienko , F Meggendorfer , F Meier , M Merola , F Metzner , M Milesi , C Miller , K Miyabayashi , R Mizuk , K Azmi , G B Mohanty , H-G Moser , M Mrvar , F J Müller , R Mussa , I Nakamura , M Nakao , H Nakazawa , A Natochii , C Niebuhr , N K Nisar , S Nishida , M H A Nouxman , K Ogawa , S Ogawa , H Ono , P Oskin , H Ozaki , P Pakhlov , A Paladino , A Panta , E Paoloni , S Pardi , H Park , S-H Park , B Paschen , A Passeri , A Pathak , S Patra , S Paul , T K Pedlar , I Peruzzi , R Peschke , M Piccolo , L E Piilonen , G Polat , V Popov , C Praz , E Prencipe , M T Prim , M V Purohit , N Rad , P Rados , R Rasheed , M Reif , S Reiter , M Remnev , I Ripp-Baudot , M Ritter , M Ritzert , G Rizzo , S H Robertson , D Rodríguez Pérez , J M Roney , C Rosenfeld , A Rostomyan , N Rout , D Sahoo , Y Sakai , D A Sanders , S Sandilya , A Sangal , L Santelj , Y Sato , V Savinov , B Scavino , C Schwanda , A J Schwartz , R M Seddon , Y Seino , A Selce , K Senyo , J Serrano , M E Sevior , C Sfienti , J-G Shiu , A Sibidanov , F Simon , R J Sobie , A Soffer , E Solovieva , S Spataro , B Spruck , M Starič , S Stefkova , Z S Stottler , R Stroili , J Strube , M Sumihama , T Sumiyoshi , D J Summers , W Sutcliffe , H Svidras , M Tabata , M Takizawa , U Tamponi , S Tanaka , K Tanida , H Tanigawa , P Taras , F Tenchini , D Tonelli , E Torassa , K Trabelsi , M Uchida , T Uglov , K Unger , Y Unno , S Uno , P Urquijo , Y Ushiroda , S E Vahsen , R van Tonder , G S Varner , K E Varvell , A Vinokurova , L Vitale , E Waheed , M Wakai , H M Wakeling , C H Wang , M-Z Wang , X L Wang , A Warburton , M Watanabe , S Watanuki , J Webb , S Wehle , M Welsch , C Wessel , J Wiechczynski , H Windel , E Won , L J Wu , X P Xu , B Yabsley , W Yan , S B Yang , H Ye , M Yonenaga , C Z Yuan , Y Yusa , L Zani , Q D Zhou , V I Zhukova PHYSICAL REVIEW LETTERS（2020）
摘要
We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e(+)e(-) -> gamma a, a -> gamma gamma in the mass range 0.2 < m(a) < 9.7 GeV/c(2) using data corresponding to an integrated luminosity of (445 +/- 3) pb(-1). Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength g(a gamma gamma) of ALPs to photons at the level of 10(-3) GeV-1. The limits are the most restrictive to date for 0.2 < m(a) < 1 GeV/c(2).
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axionlike particles, collisions, <mmlmath xmlnsmml=http//wwww3org/1998/math/mathml
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