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Search for a dark leptophilic scalar produced in association with τ^+τ^- pair in e^+e^- annihilation at center-of-mass energies near 10.58 GeV

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arxiv 2207.07476 v3 pith:277ZZYEE submitted 2022-07-15 hep-ex

Search for a dark leptophilic scalar produced in association with τ^+τ^- pair in e^+e^- annihilation at center-of-mass energies near 10.58 GeV

Belle Collaboration: D. Biswas , Sw. Banerjee , I. Adachi , H. Aihara , D. M. Asner , T. Aushev , R. Ayad , V. Babu
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P. Behera J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka D. Bodrov J. Borah A. Bozek M. Bra\v{c}ko P. Branchini T. E. Browder A. Budano M. Campajola D. \v{C}ervenkov M.-C. Chang P. Chang B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Dole\v{z}al T. V. Dong S. Dubey P. Ecker D. Epifanov T. Ferber B. G. Fulsom V. Gaur A. Garmash A. Giri P. Goldenzweig E. Graziani Y. Guan K. Gudkova C. Hadjivasiliou K. Hayasaka H. Hayashii S. Hazra M. T. Hedges D. Herrmann M. Hern\'andez Villanueva W.-S. Hou C.-L. Hsu K. Inami G. Inguglia N. Ipsita A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs Q. P. Ji S. Jia Y. Jin K. K. Joo A. B. Kaliyar C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim Y. J. Kim Y.-K. Kim P. Kody\v{s} T. Konno A. Korobov S. Korpar P. Kri\v{z}an P. Krokovny M. Kumar K. Kumara Y.-J. Kwon Y.-T. Lai M. Laurenza S. C. Lee D. Levit J. Li L. K. Li Y. Li L. Li Gioi J. Libby K. Lieret Y.-R. Lin D. Liventsev T. Luo Y. Ma M. Masuda S. K. Maurya F. Meier M. Merola F. Metzner K. Miyabayashi R. Mizuk I. Nakamura M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono P. Pakhlov G. Pakhlova S. Pardi H. Park J. Park S.-H. Park A. Passeri S. Patra S. Paul R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim N. Rout G. Russo S. Sandilya L. Santelj V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior W. Shan C. Sharma J.-G. Shiu B. Shwartz J. B. Singh A. Sokolov E. Solovieva M. Stari\v{c} Z. S. Stottler M. Sumihama M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno K. Uno S. Uno P. Urquijo A. Vinokurova D. Wang E. Wang S. Watanuki E. Won X. Xu B. D. Yabsley W. Yan J. H. Yin C. Z. Yuan L. Yuan Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov
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classification hep-ex
keywords darkdataleptonsleptophiliclimitsnearscalarsearch
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A dark leptophilic scalar $(\phi_L)$ is a hypothetical particle that couples only to leptons rather than quarks. We report on a search for $\phi_L$ in the $e^+e^- \to \tau^+ \tau^- \phi_L, ~\phi_L \to \ell^+ \ell^- ~(\ell = e, \mu)$ process using 626~\invfb of data collected by the Belle experiment near the \Y4S resonance. We validate the backgrounds with multiple control regions in data, using a novel multiclass multivariate event classifier. In absence of a signal, we quote upper limits at the 90\% confidence level on the coupling between $\phi_L$ and leptons. Our bounds, obtained in a blinded approach, are 19\% more constraining than the previous limits, averaged over the mass range $0.04 \leq m_{\phi_L} \leq 6.5~\gev$. We exclude the parameter space below 4~\gev favored by measurement of the anomalous magnetic moment of the muon.

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