Search for a light Higgs boson in single-photon decays of $\Upsilon(1S)$ using $\Upsilon(2S) \to \pi^+ \pi^- \Upsilon(1S)$ tagging method

We search for a light Higgs boson (<math display="inline"><msup><mi>A</mi><mn>0</mn></msup></math>) decaying into a <math display="inline"><msup><mi>τ</mi><mo>+</mo></msup><msup><mi...

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Detalles Bibliográficos
Autores principales: Jia, S., Shen, C.P., Adachi, I., Aihara, H., Said, S. Al, Asner, D.M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bobrov, A., Bodrov, D., Bonvicini, G., Borah, J., Bračko, M., Branchini, P., Browder, T.E., Budano, A., Campajola, M., Červenkov, D., Chang, M.-C., Chang, P., Chekelian, V., Chen, A., Cheon, B.G., Chilikin, K., Cho, H.E., Cho, K., Cho, S.-J., Choi, S.-K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Das, S., Dash, N., De Nardo, G., De Pietro, G., Dhamija, R., Di Capua, F., Doležal, Z., Dong, T.V., Epifanov, D., Ferber, T., Ferlewicz, D., Fulsom, B.G., Garg, R., Gaur, V., Gabyshev, N., Giri, A., Goldenzweig, P., Golob, B., Graziani, E., Guan, Y., Gudkova, K., Hadjivasiliou, C., Hara, T., Hayasaka, K., Hayashii, H., Hedges, M.T., Hou, W.-S., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W.W., Jang, E.-J., Jin, Y., Joo, K.K., Kahn, J., Kaliyar, A.B., Kang, K.H., Kawasaki, T., Kiesling, C., Kim, C.H., Kim, D.Y., Kim, K.-H., Kim, Y.-K., Kinoshita, K., Kodyš, P., Kohani, S., Konno, T., Korobov, A., Korpar, S., Kovalenko, E., Križan, P., Kroeger, R., Krokovny, P., Kumar, M., Kumar, R., Kumara, K., Kwon, Y.-J., Lam, T., Laurenza, M., Lee, S.C., Li, J., Li, L.K., Li, Y., Li, Y.B., Gioi, L. Li, Libby, J., Lieret, K., Liventsev, D., Martini, A., Masuda, M., Matsuda, T., Matvienko, D., Maurya, S.K., Meier, F., Merola, M., Metzner, F., Miyabayashi, K., Mizuk, R., Mohanty, G.B., Nakao, M., Narwal, D., Natkaniec, Z., Natochii, A., Nayak, L., Nisar, N.K., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Ono, H., Oskin, P., Pakhlov, P., Pakhlova, G., Pang, T., Pardi, S., Park, S.-H., Patra, S., Paul, S., Pedlar, T.K., Pestotnik, R., Piilonen, L.E., Podobnik, T., Prencipe, E., Prim, M.T., Röhrken, M., Rostomyan, A., Rout, N., Russo, G., Sahoo, D., Sandilya, S., Sangal, A., Santelj, L., Sanuki, T., Savinov, V., Schnell, G., Schueler, J., Schwanda, C., Seino, Y., Senyo, K., Sevior, M.E., Shapkin, M., Sharma, C., Shebalin, V., Shiu, J.-G., Shwartz, B., Singh, J.B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Stottler, Z.S., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Trabelsi, K., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, K., Uno, S., Urquijo, P., Vahsen, S.E., Van Tonder, R., Varner, G., Vinokurova, A., Waheed, E., Wang, D., Wang, E., Wang, M.-Z., Watanuki, S., Won, E., Yabsley, B.D., Yan, W., Yang, S.B., Ye, H., Yelton, J., Yin, J.H., Yusa, Y., Zhai, Y., Zhang, Z.P., Zhilich, V., Zhukova, V.
Lenguaje:eng
Publicado: 2021
Materias:
hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.128.081804
http://cds.cern.ch/record/2802267
Descripción
Sumario:We search for a light Higgs boson (<math display="inline"><msup><mi>A</mi><mn>0</mn></msup></math>) decaying into a <math display="inline"><msup><mi>τ</mi><mo>+</mo></msup><msup><mi>τ</mi><mo>-</mo></msup></math> or <math display="inline"><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> pair in the radiative decays of <math display="inline"><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo></math>. The production of <math display="inline"><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo></math> mesons is tagged by <math display="inline"><mrow><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>-</mo></mrow></msup><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></math> transitions, using <math display="inline"><mn>158</mn><mo>×</mo><msup><mn>10</mn><mn>6</mn></msup></math> <math display="inline"><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></math> events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant <math display="inline"><msup><mi>A</mi><mn>0</mn></msup></math> signals in the mass range from the <math display="inline"><msup><mi>τ</mi><mo>+</mo></msup><msup><mi>τ</mi><mo>-</mo></msup></math> or <math display="inline"><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> threshold to <math display="inline"><mrow><mn>9.2</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for <math display="inline"><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo><mo stretchy="false">→</mo><mi>γ</mi><msup><mi>A</mi><mn>0</mn></msup></math> and <math display="inline"><msup><mi>A</mi><mn>0</mn></msup><mo stretchy="false">→</mo><msup><mi>τ</mi><mo>+</mo></msup><msup><mi>τ</mi><mo>-</mo></msup></math> varying from <math display="inline"><mn>3.8</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>6</mn></mrow></msup></math> to <math display="inline"><mn>1.5</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>4</mn></mrow></msup></math>. Our results represent an approximately twofold improvement on the current world best upper limits for the <math display="inline"><mrow><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo><mo stretchy="false">→</mo><mi>γ</mi><msup><mrow><mi>A</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">(</mo><mo stretchy="false">→</mo><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>-</mo></mrow></msup><mo stretchy="false">)</mo></mrow></math> production. For <math display="inline"><mrow><msup><mrow><mi>A</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>-</mo></mrow></msup></mrow></math>, the upper limits on the product branching fractions for <math display="inline"><mrow><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo><mo stretchy="false">→</mo><mi>γ</mi><msup><mrow><mi>A</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> and <math display="inline"><msup><mi>A</mi><mn>0</mn></msup><mo stretchy="false">→</mo><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> are at the same level as the world average limits, and vary from <math display="inline"><mn>3.1</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>7</mn></mrow></msup></math> to <math display="inline"><mn>1.6</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>5</mn></mrow></msup></math>. The upper limits at 90% credibility level on the Yukawa coupling <math display="inline"><msub><mi>f</mi><mrow><mi mathvariant="normal">ϒ</mi><mo stretchy="false">(</mo><mn>1</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></msub></math> and mixing angle <math display="inline"><mi>sin</mi><msub><mi>θ</mi><msup><mi>A</mi><mn>0</mn></msup></msub></math> are also given.

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