Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data

  • The recent measurements on RK and Rπ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the Standard Model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a μ-τ asymmetry, therefore the measurements on RD(Ds)eμ=Γ(D(Ds)→ e+νe)/Γ(D(Ds)→ μ+νμ) and RD(Dsτ=Γ(D(Ds)→ μ+νμ)/Γ(D(Ds)→ τ+ντ) (and for some other heavy mesons B± and Bc etc.) may shed more light on the physics responsible for the violation of the leptonic flavor universality. The data of BESⅢ are available to test the universality and that of future charm-tau factories will provide more accurate information. In this work, we will discuss RD(Ds)eμ and RD(Dsτ in detail and also briefly consider the cases for B± and Bc.
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  • [1] The LEP Collaborations, the LEP Electroweak Working Group, and the SLD Heavy Flavor and Electroweak Groups. CERN-EP/2003-091, arXiv: hep-ex/0312023[2] Filipuzzi A, Gonzalez-Alonso M, Portoles J. Phys. Rev. D, 2012, 85: 116010[3] Abada A, Das D, Teixeira A M, Vicente A, Weiland C. arXiv: 1211.3052[hep-ph][4] HOU Wei-Shu. Phys. Rev. D, 1993, 48: 2342[5] Lopez-Val D, Sola J. arXiv:1211.0311 [hep-ph][6] Masiero A, Paradisi P, Petronzio R. Phys. Rev. D, 2006, 74: 011701; Masiero A, Paradisi P, Petronzio R. JHEP, 2008, 0811: 042; Ellis J, Lola S, Raidal M, Nucl. Phys. B, 2009, 812: 128; Girrbach J, Nierste U. arXiv:1202.4906 [hep-ph]; Fonseca R M, Romao J C, Teixeira A M. Eur. Phys. J. C, 2012, 72: 2228[7] Minkowski P. Phys. Lett. B, 1977, 67: 421; Yanagida T. In: Proc. of the Workshop on Unifed Theory and the Baryon Number of the Universe. Sawada O Sugamoto A. Tsukuba: KEK, 1979. 95; Gell-Mann M, Ramond P, Slansky R. Supergravity. Amsterdam: North-Holland, 1979. 315; Glashow S L. Quarks and Leptons. New York: Plenum, 1980. 707; Mohapatra R N, Senjanovic G. Phys. Rev. Lett., 1980, 44: 912[8] XING Zhi-Zhong, ZHOU Shun. Neutrinos in Particle Physics, Astronomy and Cosmology. Zhejiang University Press and Springer-Verlag, 2011[9] Wyler D, Wolfenstein L. Nucl. Phys. B, 1983, 218: 205; Mohapatra R N, Valle J W F. Phys. Rev. D, 1986, 34: 1642; Ma E. Phys. Lett. B, 1987, 191: 287[10] Aguilar A et al. (LSND collaboration). Phys. Rev. D, 2001, 64: 112007[11] Aguilar-Arevalo A A et al. (MiniBooNE collaboration). Phys. Rev. Lett., 2010, 105: 181801[12] Mueller Th A et al. Phys. Rev. C, 2011, 83: 054615[13] Anselmann P et al. (GALLEX collaboration.). Phys. Lett. B, 1995, 342: 440; Hampel W et al. (GALLEX collaboration). Phys. Lett. B, 1998, 420: 114; Kaether F et al. Phys. Lett. B, 2010, 685: 47[14] Abdurashitov D et al. Phys. Rev. Lett., 1996, 77: 4708; Abdurashitov J et al. (SAGE collaboration). Phys. Rev. C, 1999, 59: 2246; Abdurashitov J et al. Phys. Rev. C, 2006, 73: 045805; Abdurashitov J et al. (SAGE collaboration). Phys. Rev. C, 2009, 80: 015807[15] ZHAO Gong-Bo et al. arXiv:1211.3741 [astro-ph.CO][16] Goudzovski E. (NA48/2 and NA62 collaborations). arXiv:1111.2818 [hep-ex][17] Balev S. arXiv:1006.1201 [hep-ex][18] Abazajian K N et al. arXiv:1204.5379 [hep-ph][19] Pontecorvo B. Zh. Eksp. Theor. Fiz., 1957, 33: 549; Pontecorvo B. Zh. Eksp. Theor. Fiz., 1958, 34: 247[20] Maki Z, Nakagawa M, Sakata S. Prog. Theor. Phys., 1962, 28: 870[21] Antusch S et al. JHEP, 2006, 0610: 084[22] XING Zhi-Zhong. arXiv: 1210.1523[hep-ph][23] Beringer J et al. (Particle Data Group). Phys. Rev. D, 2012, 86: 010001[24] Mohanta R. Eur. Phys. J. C, 2011, 71: 1625[25] Aubert B et al. (The BABAR collaboration). arXiv: 0912.2453 [hep-ex][26] Crivellin A, Kokulu A, Greub C. arXiv:1303.5877 [hep-ph][27] Heister A et al. (ALEPH collaboration). Phys. Lett. B, 2002, 528: 1[28] Abbiendi G et al. (OPAL collaboration). Phys. Lett. B, 2001, 516: 236[29] Acciarri M et al. (L3 collaboration). Phys. Lett. B, 1997, 396: 327[30] del Amo Sanchez P et al. (Babar collaboration). Phys. Rev. D, 2010, 82: 091103[31] Widhalm L et al. (BELLE collaboration). Phys. Rev. Lett., 2008, 100: 241801[32] Bonvicini G et al. (CLEO collaboration). Phys. Rev. D, 2004, 70: 112004; Artuso M et al. (CLEO collaboration). Phys. Rev. Lett., 2005, 95: 251801; Rubin P et al. (CLEO collaboration). Phys. Rev. D, 2006, 73: 112005; Pedlar T K et al. (CLEO collaboration). Phys. Rev. D, 2007, 76: 072002; Eisenstein B I et al. (CLEO collaboration). Phys. Rev. D, 2008, 78: 052003; Ecklund K M et al. (CLEO collaboration). Phys. Rev. Lett., 2008, 100: 161801; Alexander J P et al. (CLEO collaboration). Phys. Rev. D, 2009, 79: 052001; Onyisi P U E et al. (CLEO collaboration). Phys. Rev. D, 2009, 79: 052002; Naik P et al. (CLEO collaboration). Phys. Rev. D, 2009, 80: 112004[33] BAI J Z et al. (BES collaboration). Phys. Rev. Lett., 1995, 74: 4599; Bai J Z et al. (BES collaboration). Phys. Lett. B, 1998, 492: 188; Ablikim M et al. (BESIII collaboration). Phys. Lett. B, 2005, 610: 183[34] LI W D et al. The Offine Software for the BES Experiment. Proceeding of CHEP06. Mumbai, India 13-17 Febuary 2006[35] Agostinelli S et al. (Geant4 collaboration), Nucl. Instrum. Meth. A, 2003, 506: 250[36] DENG Z Y et al. High Energy Phys. Nucl. Phys., 2003, 30: 250[37] Ablikim M et al (BESIII collaboration). Nucl. Instrum. Methods A, 2010, 614: 345[38] Ablikim M et al. (BES collaboration). Phys. Lett. B, 2004, 603: 130[39] BAI J Z et al. (BES collaboration). Phys. Rev. D, 2000, 62: 012002[40] Feldman G J, Cousins R D. Phys. Rev. D, 1998, 57: 3873[41] Mohapatra R N, Smirnov A Yu. Ann. Rev. Nucl. Part. Sci., 2006, 56: 569; GE Shao-Feng, HE Hong-Jian, YIN Fu-Rong. JCAP, 2010, 1005: 017; HE Hong-Jian, YIN Fu-Rong. Phys. Rev. D, 2011, 84: 033009; Adhikary B, Ghosal A, Roy P. arXiv:1210.5328 [hep-ph]
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WANG Bin, ZHAO Ming-Gang, SUN Ke-Sheng and LI Xue-Qian. Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data[J]. Chinese Physics C, 2013, 37(7): 073101. doi: 10.1088/1674-1137/37/7/073101
WANG Bin, ZHAO Ming-Gang, SUN Ke-Sheng and LI Xue-Qian. Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data[J]. Chinese Physics C, 2013, 37(7): 073101.  doi: 10.1088/1674-1137/37/7/073101 shu
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Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data

    Corresponding author: WANG Bin,
    Corresponding author: ZHAO Ming-Gang,
    Corresponding author: SUN Ke-Sheng,
    Corresponding author: LI Xue-Qian,

Abstract: The recent measurements on RK and Rπ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the Standard Model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a μ-τ asymmetry, therefore the measurements on RD(Ds)eμ=Γ(D(Ds)→ e+νe)/Γ(D(Ds)→ μ+νμ) and RD(Dsτ=Γ(D(Ds)→ μ+νμ)/Γ(D(Ds)→ τ+ντ) (and for some other heavy mesons B± and Bc etc.) may shed more light on the physics responsible for the violation of the leptonic flavor universality. The data of BESⅢ are available to test the universality and that of future charm-tau factories will provide more accurate information. In this work, we will discuss RD(Ds)eμ and RD(Dsτ in detail and also briefly consider the cases for B± and Bc.

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