Letter
Open Access

Observation of the decay $D^{0} \to ρ^{-} μ^{+} ν_{μ}$

M. Ablikim¹, M. N. Achasov^10,c, P. Adlarson⁶⁷, S. Ahmed¹⁵, M. Albrecht⁴, R. Aliberti²⁸, A. Amoroso^66a,66c, M. R. An³², Q. An^63,49 et al. (BESIII Collaboration)

Q. An^63,49, X. H. Bai⁵⁷, Y. Bai⁴⁸, O. Bakina²⁹, R. Baldini Ferroli^23a, I. Balossino^24a, Y. Ban^38,k, K. Begzsuren²⁶, N. Berger²⁸, M. Bertani^23a, D. Bettoni^24a, F. Bianchi^66a,66c, J. Bloms⁶⁰, A. Bortone^66a,66c, I. Boyko²⁹, R. A. Briere⁵, H. Cai⁶⁸, X. Cai^1,49, A. Calcaterra^23a, G. F. Cao^1,54, N. Cao^1,54, S. A. Cetin^53a, J. F. Chang^1,49, W. L. Chang^1,54, G. Chelkov^29,b, D. Y. Chen⁶, G. Chen¹, H. S. Chen^1,54, M. L. Chen^1,49, S. J. Chen³⁵, X. R. Chen²⁵, Y. B. Chen^1,49, Z. J. Chen^20,l, W. S. Cheng^66c, G. Cibinetto^24a, F. Cossio^66c, X. F. Cui³⁶, H. L. Dai^1,49, X. C. Dai^1,54, A. Dbeyssi¹⁵, R. E. de Boer⁴, D. Dedovich²⁹, Z. Y. Deng¹, A. Denig²⁸, I. Denysenko²⁹, M. Destefanis^66a,66c, F. De Mori^66a,66c, Y. Ding³³, C. Dong³⁶, J. Dong^1,49, L. Y. Dong^1,54, M. Y. Dong^1,49,54, X. Dong⁶⁸, S. X. Du⁷¹, Y. L. Fan⁶⁸, J. Fang^1,49, S. S. Fang^1,54, Y. Fang¹, R. Farinelli^24a, L. Fava^66b,66c, F. Feldbauer⁴, G. Felici^23a, C. Q. Feng^63,49, J. H. Feng⁵⁰, M. Fritsch⁴, C. D. Fu¹, Y. Gao^63,49, Y. Gao^38,k, Y. Gao⁶⁴, Y. G. Gao⁶, I. Garzia^24a,24b, P. T. Ge⁶⁸, C. Geng⁵⁰, E. M. Gersabeck⁵⁸, A. Gilman⁶¹, K. Goetzen¹¹, L. Gong³³, W. X. Gong^1,49, W. Gradl²⁸, M. Greco^66a,66c, L. M. Gu³⁵, M. H. Gu^1,49, S. Gu², Y. T. Gu¹³, C. Y. Guan^1,54, A. Q. Guo²², L. B. Guo³⁴, R. P. Guo⁴⁰, Y. P. Guo^9,h, A. Guskov^29,b, T. T. Han⁴¹, W. Y. Han³², X. Q. Hao¹⁶, F. A. Harris⁵⁶, N. Hüsken^22,28, K. L. He^1,54, F. H. Heinsius⁴, C. H. Heinz²⁸, T. Held⁴, Y. K. Heng^1,49,54, C. Herold⁵¹, M. Himmelreich^11,f, T. Holtmann⁴, G. Y. Hou^1,54, Y. R. Hou⁵⁴, Z. L. Hou¹, H. M. Hu^1,54, J. F. Hu^47,m, T. Hu^1,49,54, Y. Hu¹, G. S. Huang^63,49, L. Q. Huang⁶⁴, X. T. Huang⁴¹, Y. P. Huang¹, Z. Huang^38,k, T. Hussain⁶⁵, W. Ikegami Andersson⁶⁷, W. Imoehl²², M. Irshad^63,49, S. Jaeger⁴, S. Janchiv^26,j, Q. Ji¹, Q. P. Ji¹⁶, X. B. Ji^1,54, X. L. Ji^1,49, Y. Y. Ji⁴¹, H. B. Jiang⁴¹, X. S. Jiang^1,49,54, J. B. Jiao⁴¹, Z. Jiao¹⁸, S. Jin³⁵, Y. Jin⁵⁷, M. Q. Jing^1,54, T. Johansson⁶⁷, N. Kalantar-Nayestanaki⁵⁵, X. S. Kang³³, R. Kappert⁵⁵, M. Kavatsyuk⁵⁵, B. C. Ke^43,1, I. K. Keshk⁴, A. Khoukaz⁶⁰, P. Kiese²⁸, R. Kiuchi¹, R. Kliemt¹¹, L. Koch³⁰, O. B. Kolcu^53a,e, B. Kopf⁴, M. Kuemmel⁴, M. Kuessner⁴, A. Kupsc⁶⁷, M. G. Kurth^1,54, W. Kühn³⁰, J. J. Lane⁵⁸, J. S. Lange³⁰, P. Larin¹⁵, A. Lavania²¹, L. Lavezzi^66a,66c, Z. H. Lei^63,49, H. Leithoff²⁸, M. Lellmann²⁸, T. Lenz²⁸, C. Li³⁹, C. H. Li³², Cheng Li^63,49, D. M. Li⁷¹, F. Li^1,49, G. Li¹, H. Li^63,49, H. Li⁴³, H. B. Li^1,54, H. J. Li¹⁶, J. L. Li⁴¹, J. Q. Li⁴, J. S. Li⁵⁰, Ke Li¹, L. K. Li¹, Lei Li³, P. R. Li^31,n,o, S. Y. Li⁵², W. D. Li^1,54, W. G. Li¹, X. H. Li^63,49, X. L. Li⁴¹, Xiaoyu Li^1,54, Z. Y. Li⁵⁰, H. Liang^1,54, H. Liang^63,49, H. Liang²⁷, Y. F. Liang⁴⁵, Y. T. Liang²⁵, G. R. Liao¹², L. Z. Liao^1,54, J. Libby²¹, C. X. Lin⁵⁰, B. J. Liu¹, C. X. Liu¹, D. Liu^15,63, F. H. Liu⁴⁴, Fang Liu¹, Feng Liu⁶, H. B. Liu¹³, H. M. Liu^1,54, Huanhuan Liu¹, Huihui Liu¹⁷, J. B. Liu^63,49, J. L. Liu⁶⁴, J. Y. Liu^1,54, K. Liu¹, K. Y. Liu³³, L. Liu^63,49, M. H. Liu^9,h, P. L. Liu¹, Q. Liu⁵⁴, Q. Liu⁶⁸, S. B. Liu^63,49, Shuai Liu⁴⁶, T. Liu^1,54, W. M. Liu^63,49, X. Liu^31,n,o, Y. Liu^31,n,o, Y. B. Liu³⁶, Z. A. Liu^1,49,54, Z. Q. Liu⁴¹, X. C. Lou^1,49,54, F. X. Lu⁵⁰, H. J. Lu¹⁸, J. D. Lu^1,54, J. G. Lu^1,49, X. L. Lu¹, Y. Lu¹, Y. P. Lu^1,49, C. L. Luo³⁴, M. X. Luo⁷⁰, P. W. Luo⁵⁰, T. Luo^9,h, X. L. Luo^1,49, X. R. Lyu⁵⁴, F. C. Ma³³, H. L. Ma¹, L. L. Ma⁴¹, M. M. Ma^1,54, Q. M. Ma¹, R. Q. Ma^1,54, R. T. Ma⁵⁴, X. X. Ma^1,54, X. Y. Ma^1,49, F. E. Maas¹⁵, M. Maggiora^66a,66c, S. Maldaner⁴, S. Malde⁶¹, Q. A. Malik⁶⁵, A. Mangoni^23b, Y. J. Mao^38,k, Z. P. Mao¹, S. Marcello^66a,66c, Z. X. Meng⁵⁷, J. G. Messchendorp⁵⁵, G. Mezzadri^24a, T. J. Min³⁵, R. E. Mitchell²², X. H. Mo^1,49,54, Y. J. Mo⁶, N. Yu. Muchnoi^10,c, H. Muramatsu⁵⁹, S. Nakhoul^11,f, Y. Nefedov²⁹, F. Nerling^11,f, I. B. Nikolaev^10,c, Z. Ning^1,49, S. Nisar^8,i, S. L. Olsen⁵⁴, Q. Ouyang^1,49,54, S. Pacetti^23b,23c, X. Pan^9,h, Y. Pan⁵⁸, A. Pathak¹, P. Patteri^23a, M. Pelizaeus⁴, H. P. Peng^63,49, K. Peters^11,f, J. Pettersson⁶⁷, J. L. Ping³⁴, R. G. Ping^1,54, R. Poling⁵⁹, V. Prasad^63,49, H. Qi^63,49, H. R. Qi⁵², K. H. Qi²⁵, M. Qi³⁵, T. Y. Qi⁹, S. Qian^1,49, W. B. Qian⁵⁴, Z. Qian⁵⁰, C. F. Qiao⁵⁴, L. Q. Qin¹², X. P. Qin⁹, X. S. Qin⁴¹, Z. H. Qin^1,49, J. F. Qiu¹, S. Q. Qu³⁶, K. H. Rashid⁶⁵, K. Ravindran²¹, C. F. Redmer²⁸, A. Rivetti^66c, V. Rodin⁵⁵, M. Rolo^66c, G. Rong^1,54, Ch. Rosner¹⁵, M. Rump⁶⁰, H. S. Sang⁶³, A. Sarantsev^29,d, Y. Schelhaas²⁸, C. Schnier⁴, K. Schoenning⁶⁷, M. Scodeggio^24a,24b, D. C. Shan⁴⁶, W. Shan¹⁹, X. Y. Shan^63,49, J. F. Shangguan⁴⁶, M. Shao^63,49, C. P. Shen⁹, H. F. Shen^1,54, P. X. Shen³⁶, X. Y. Shen^1,54, H. C. Shi^63,49, R. S. Shi^1,54, X. Shi^1,49, X. D. Shi^63,49, J. J. Song⁴¹, W. M. Song^27,1, Y. X. Song^38,k, S. Sosio^66a,66c, S. Spataro^66a,66c, K. X. Su⁶⁸, P. P. Su⁴⁶, F. F. Sui⁴¹, G. X. Sun¹, H. K. Sun¹, J. F. Sun¹⁶, L. Sun⁶⁸, S. S. Sun^1,54, T. Sun^1,54, W. Y. Sun²⁷, W. Y. Sun³⁴, X. Sun^20,l, Y. J. Sun^63,49, Y. K. Sun^63,49, Y. Z. Sun¹, Z. T. Sun¹, Y. H. Tan⁶⁸, Y. X. Tan^63,49, C. J. Tang⁴⁵, G. Y. Tang¹, J. Tang⁵⁰, J. X. Teng^63,49, V. Thoren⁶⁷, W. H. Tian⁴³, Y. T. Tian²⁵, I. Uman^53b, B. Wang¹, C. W. Wang³⁵, D. Y. Wang^38,k, H. J. Wang^31,n,o, H. P. Wang^1,54, K. Wang^1,49, L. L. Wang¹, M. Wang⁴¹, M. Z. Wang^38,k, Meng Wang^1,54, W. Wang⁵⁰, W. H. Wang⁶⁸, W. P. Wang^63,49, X. Wang^38,k, X. F. Wang^31,n,o, X. L. Wang^9,h, Y. Wang⁵⁰, Y. Wang^63,49, Y. D. Wang³⁷, Y. F. Wang^1,49,54, Y. Q. Wang¹, Y. Y. Wang^31,n,o, Z. Wang^1,49, Z. Y. Wang¹, Ziyi Wang⁵⁴, Zongyuan Wang^1,54, D. H. Wei¹², F. Weidner⁶⁰, S. P. Wen¹, D. J. White⁵⁸, U. Wiedner⁴, G. Wilkinson⁶¹, M. Wolke⁶⁷, L. Wollenberg⁴, J. F. Wu^1,54, L. H. Wu¹, L. J. Wu^1,54, X. Wu^9,h, Z. Wu^1,49, L. Xia^63,49, H. Xiao^9,h, S. Y. Xiao¹, Z. J. Xiao³⁴, X. H. Xie^38,k, Y. G. Xie^1,49, Y. H. Xie⁶, T. Y. Xing^1,54, G. F. Xu¹, Q. J. Xu¹⁴, W. Xu^1,54, X. P. Xu⁴⁶, Y. C. Xu⁵⁴, F. Yan^9,h, L. Yan^9,h, W. B. Yan^63,49, W. C. Yan⁷¹, Xu Yan⁴⁶, H. J. Yang^42,g, H. X. Yang¹, L. Yang⁴³, S. L. Yang⁵⁴, Y. X. Yang¹², Yifan Yang^1,54, Zhi Yang²⁵, M. Ye^1,49, M. H. Ye⁷, J. H. Yin¹, Z. Y. You⁵⁰, B. X. Yu^1,49,54, C. X. Yu³⁶, G. Yu^1,54, J. S. Yu^20,l, T. Yu⁶⁴, C. Z. Yuan^1,54, L. Yuan², X. Q. Yuan^38,k, Y. Yuan¹, Z. Y. Yuan⁵⁰, C. X. Yue³², A. Yuncu^53a,a, A. A. Zafar⁶⁵, Zeng⁶, Y. Zeng^20,l, A. Q. Zhang¹, B. X. Zhang¹, Guangyi Zhang¹⁶, H. Zhang⁶³, H. H. Zhang²⁷, H. H. Zhang⁵⁰, H. Y. Zhang^1,49, J. J. Zhang⁴³, J. L. Zhang⁶⁹, J. Q. Zhang³⁴, J. W. Zhang^1,49,54, J. Y. Zhang¹, J. Z. Zhang^1,54, Jianyu Zhang^1,54, Jiawei Zhang^1,54, L. M. Zhang⁵², L. Q. Zhang⁵⁰, Lei Zhang³⁵, S. Zhang⁵⁰, S. F. Zhang³⁵, Shulei Zhang^20,l, X. D. Zhang³⁷, X. Y. Zhang⁴¹, Y. Zhang⁶¹, Y. H. Zhang^1,49, Y. T. Zhang^63,49, Yan Zhang^63,49, Yao Zhang¹, Yi Zhang^9,h, Z. H. Zhang⁶, Z. Y. Zhang⁶⁸, G. Zhao¹, J. Zhao³², J. Y. Zhao^1,54, J. Z. Zhao^1,49, Lei Zhao^63,49, Ling Zhao¹, M. G. Zhao³⁶, Q. Zhao¹, S. J. Zhao⁷¹, Y. B. Zhao^1,49, Y. X. Zhao²⁵, Z. G. Zhao^63,49, A. Zhemchugov^29,b, B. Zheng⁶⁴, J. P. Zheng^1,49, Y. Zheng^38,k, Y. H. Zheng⁵⁴, B. Zhong³⁴, C. Zhong⁶⁴, L. P. Zhou^1,54, Q. Zhou^1,54, X. Zhou⁶⁸, X. K. Zhou⁵⁴, X. R. Zhou^63,49, X. Y. Zhou³², A. N. Zhu^1,54, J. Zhu³⁶, K. Zhu¹, K. J. Zhu^1,49,54, S. H. Zhu⁶², T. J. Zhu⁶⁹, W. J. Zhu^9,h, W. J. Zhu³⁶, Y. C. Zhu^63,49, Z. A. Zhu^1,54, B. S. Zou¹, and J. H. Zou¹ (BESIII Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People’s Republic of China
²Beihang University, Beijing 100191, People’s Republic of China
³Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China
⁴Bochum Ruhr-University, D-44780 Bochum, Germany
⁵Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁶Central China Normal University, Wuhan 430079, People’s Republic of China
⁷China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China
⁸COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
⁹Fudan University, Shanghai 200443, People’s Republic of China
¹⁰G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
¹¹GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
¹²Guangxi Normal University, Guilin 541004, People’s Republic of China
¹³Guangxi University, Nanning 530004, People’s Republic of China
¹⁴Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
¹⁵Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
¹⁶Henan Normal University, Xinxiang 453007, People’s Republic of China
¹⁷Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
¹⁸Huangshan College, Huangshan 245000, People’s Republic of China
¹⁹Hunan Normal University, Changsha 410081, People’s Republic of China
²⁰Hunan University, Changsha 410082, People’s Republic of China
²¹Indian Institute of Technology Madras, Chennai 600036, India
²²Indiana University, Bloomington, Indiana 47405, USA
^23aINFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
^23bINFN Sezione di Perugia, I-06100 Perugia, Italy
^23cUniversity of Perugia, I-06100 Perugia, Italy
^24aINFN Sezione di Ferrara, I-44122 Ferrara, Italy
^24bUniversity of Ferrara, I-44122 Ferrara, Italy
²⁵Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
²⁶Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
²⁷Jilin University, Changchun 130012, People’s Republic of China
²⁸Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
²⁹Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
³⁰Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
³¹Lanzhou University, Lanzhou 730000, People’s Republic of China
³²Liaoning Normal University, Dalian 116029, People’s Republic of China
³³Liaoning University, Shenyang 110036, People’s Republic of China
³⁴Nanjing Normal University, Nanjing 210023, People’s Republic of China
³⁵Nanjing University, Nanjing 210093, People’s Republic of China
³⁶Nankai University, Tianjin 300071, People’s Republic of China
³⁷North China Electric Power University, Beijing 102206, People’s Republic of China
³⁸Peking University, Beijing 100871, People’s Republic of China
³⁹Qufu Normal University, Qufu 273165, People’s Republic of China
⁴⁰Shandong Normal University, Jinan 250014, People’s Republic of China
⁴¹Shandong University, Jinan 250100, People’s Republic of China
⁴²Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁴³Shanxi Normal University, Linfen 041004, People’s Republic of China
⁴⁴Shanxi University, Taiyuan 030006, People’s Republic of China
⁴⁵Sichuan University, Chengdu 610064, People’s Republic of China
⁴⁶Soochow University, Suzhou 215006, People’s Republic of China
⁴⁷South China Normal University, Guangzhou 510006, People’s Republic of China
⁴⁸Southeast University, Nanjing 211100, People’s Republic of China
⁴⁹State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
⁵⁰Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁵¹Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
⁵²Tsinghua University, Beijing 100084, People’s Republic of China
^53aTurkish Accelerator Center Particle Factory Group, Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey
^53bNear East University, Nicosia, North Cyprus, Mersin 10, Turkey
⁵⁴University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁵⁵University of Groningen, NL-9747 AA Groningen, Netherlands
⁵⁶University of Hawaii, Honolulu, Hawaii 96822, USA
⁵⁷University of Jinan, Jinan 250022, People’s Republic of China
⁵⁸University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
⁵⁹University of Minnesota, Minneapolis, Minnesota 55455, USA
⁶⁰University of Muenster, Wilhelm-Klemm-Street 9, 48149 Muenster, Germany
⁶¹University of Oxford, Keble Rd, Oxford, United Kingdom OX13RH
⁶²University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁶³University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁶⁴University of South China, Hengyang 421001, People’s Republic of China
⁶⁵University of the Punjab, Lahore-54590, Pakistan
^66aUniversity of Turin and INFN, University of Turin, I-10125 Turin, Italy
^66bUniversity of Eastern Piedmont, I-15121 Alessandria, Italy
^66cINFN, I-10125 Turin, Italy
⁶⁷Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁶⁸Wuhan University, Wuhan 430072, People’s Republic of China
⁶⁹Xinyang Normal University, Xinyang 464000, People’s Republic of China
⁷⁰Zhejiang University, Hangzhou 310027, People’s Republic of China
⁷¹Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^aAlso at Bogazici University, 34342 Istanbul, Turkey.
^bAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^cAlso at the Novosibirsk State University, Novosibirsk 630090, Russia.
^dAlso at the NRC “Kurchatov Institute”, PNPI, 188300 Gatchina, Russia.
^eAlso at Istanbul Arel University, 34295 Istanbul, Turkey.
^fAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^gAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; Institute of Nuclear and Particle Physics, Shanghai 200240, People’s Republic of China.
^hAlso at Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, People’s Republic of China.
ⁱAlso at Harvard University, Department of Physics, Cambridge, Massachusetts 02138, USA.
^jCurrently at: Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia.
^kAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
^lSchool of Physics and Electronics, Hunan University, Changsha 410082, China.
^mAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
ⁿFrontier Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^oLanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, People’s Republic of China.

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Phys. Rev. D 104, L091103 – Published 29 November, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L091103

Abstract

By analyzing an $e^{+} e^{-}$ annihilation data sample corresponding to an integrated luminosity of $2.93 {fb}^{- 1}$ collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the branching fraction of the $D^{0} \to ρ^{-} μ^{+} ν_{μ}$ decay for the first time. We obtain $B_{D^{0} \to ρ^{-} μ^{+} ν_{μ}} = (1.35 \pm {0.09}_{stat} \pm {0.09}_{syst}) \times 10^{- 3}$ . Using the world average of $B_{D^{0} \to ρ^{-} e^{+} ν_{e}}$ , we find a branching fraction ratio of $B_{D^{0} \to ρ^{-} μ^{+} ν_{μ}} / B_{D^{0} \to ρ^{-} e^{+} ν_{e}} = 0.90 \pm 0.11$ , which agrees with the theoretical expectation of lepton flavor universality within the uncertainty. Combining the world average of $B_{D^{+} \to ρ^{0} μ^{+} ν_{μ}}$ and the lifetimes of $D^{0 (+)}$ , we obtain a partial decay width ratio of $Γ_{D^{0} \to ρ^{-} μ^{+} ν_{μ}} / (2 Γ_{D^{+} \to ρ^{0} μ^{+} ν_{μ}}) = 0.71 \pm 0.14$ , which is consistent with the isospin symmetry expectation of unity within $2.1 σ$ . For the reported values of $B_{D^{0} \to ρ^{-} μ^{+} ν_{μ}} / B_{D^{0} \to ρ^{-} e^{+} ν_{e}}$ and $Γ_{D^{0} \to ρ^{-} μ^{+} ν_{μ}} / 2 Γ_{D^{+} \to ρ^{0} μ^{+} ν_{μ}}$ , the uncertainty is the quadratic sum of the statistical and systematic uncertainties.

Physics Subject Headings (PhySH)

Article Text

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Phys. Rev. D 104, L091103– Published 29 November, 2021

Vol. 104, Iss. 9 — 1 November 2021

Received 3 June 2021
Accepted 26 October 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L091103

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Observation of the decay $D^{0} \to ρ^{-} μ^{+} ν_{μ}$

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Observation of the decay D0→ρ−μ+νμ

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Observation of the decay $D^{0} \to ρ^{-} μ^{+} ν_{μ}$