β Decays as Sensitive Probes of Lepton Flavor Universality

被引：80

作者：

Crivellin, Andreas ^{[1
,2
]}

Hoferichter, Martin ^{[3
,4
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[2] Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[3] Univ Bern, Inst Theoret Phys, Albert Einstein Ctr Fundamental Phys, Sidlerstr 5, CH-3012 Bern, Switzerland

[4] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 11期

基金：

瑞士国家科学基金会;

关键词：

CP-VIOLATION; RATIO; POSITRON;

D O I：

10.1103/PhysRevLett.125.111801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Nuclear beta decays as well as the decay of the neutron are well-established low-energy probes of physics beyond the standard model (SM). In particular, with the axial-vector coupling of the nucleon g(A) determined from lattice QCD, the comparison between experiment and SM prediction is commonly used to derive constraints on right-handed currents. Further, in addition to the CKM element V-us from kaon decays, V-ud from beta decays is a critical input for the test of CKM unitarity. Here, we point out that the available information on beta decays can be reinterpreted as a stringent test of lepton flavor universality (LFU). In fact, we find that the ratio of V-us from kaon decays over V-us from beta decays (assuming CKM unitarity) is extremely sensitive to LFU violation (LFUV) in W-mu-nu couplings thanks to a CKM enhancement by (V-ud/V-us)(2) similar to 20. From this perspective, recent hints for the violation of CKM unitarity can be viewed as further evidence for LFUV, fitting into the existing picture exhibited by semileptonic B decays and the anomalous magnetic moments of muon and electron. Finally, we comment on the future sensitivity that can be reached with this LFU violating observable and discuss complementary probes of LFU that may reach a similar level of precision, such as Gamma (pi -> mu nu)/Gamma(pi -> e nu) at the PEN and PiENu experiments or even direct measurements of W -> mu nu at an FCC-ee.

引用

页数：8

共 130 条

[1]

Aaij R, 2017, J HIGH ENERGY PHYS, DOI [10.1007/JHEP08(2017)055, 10.1007/JHEP04(2017)162]

[2] Search for Lepton-Universality Violation in B+ → K+l+l- Decays [J].

Aaij, R. ;

Beteta, C. Abellan ;

Adeva, B. ;

Adinolfi, M. ;

Aidala, C. A. ;

Ajaltouni, Z. ;

Akar, S. ;

Albicocco, P. ;

Albrecht, J. ;

Alessio, F. ;

Alexander, M. ;

Albero, A. Alfonso ;

Alkhazov, G. ;

Cartelle, P. Alvarez ;

Alves, A. A., Jr. ;

Amato, S. ;

Amhis, Y. ;

An, L. ;

Anderlini, L. ;

Andreassi, G. ;

Andreotti, M. ;

Andrews, J. E. ;

Archilli, F. ;

Romeu, J. Arnau ;

Artamonov, A. ;

Artuso, M. ;

Arzymatov, K. ;

Aslanides, E. ;

Atzeni, M. ;

Audurier, B. ;

Bachmann, S. ;

Back, J. J. ;

Baker, S. ;

Balagura, V. ;

Baldini, W. ;

Baranov, A. ;

Barlow, R. J. ;

Barsuk, S. ;

Barter, W. ;

Bartolini, M. ;

Baryshnikov, F. ;

Batozskaya, V. ;

Batsukh, B. ;

Battig, A. ;

Battista, V. ;

Bay, A. ;

Bedeschi, F. ;

Bediaga, I. ;

Beiter, A. ;

Bel, L. J. .

PHYSICAL REVIEW LETTERS, 2019, 122 (19)

[3] FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1 [J].

Abada, A. ;

Abbrescia, M. ;

AbdusSalam, S. S. ;

Abdyukhanov, I. ;

Fernandez, J. Abelleira ;

Abramov, A. ;

Aburaia, M. ;

Acar, A. O. ;

Adzic, P. R. ;

Agrawal, P. ;

Aguilar-Saavedra, J. A. ;

Aguilera-Verdugo, J. J. ;

Aiba, M. ;

Aichinger, I. ;

Aielli, G. ;

Akay, A. ;

Akhundov, A. ;

Aksakal, H. ;

Albacete, J. L. ;

Albergo, S. ;

Alekou, A. ;

Aleksa, M. ;

Aleksan, R. ;

Fernandez, R. M. Alemany ;

Alexahin, Y. ;

Alia, R. G. ;

Alioli, S. ;

Tehrani, N. Alipour ;

Allanach, B. C. ;

Allport, P. P. ;

Altinli, M. ;

Altmannshofer, W. ;

Ambrosio, G. ;

Amorim, D. ;

Amstutz, O. ;

Anderlini, L. ;

Andreazza, A. ;

Andreini, M. ;

Andriatis, A. ;

Andris, C. ;

Andronic, A. ;

Angelucci, M. ;

Antinori, F. ;

Antipov, S. A. ;

Antonelli, M. ;

Antonello, M. ;

Antonioli, P. ;

Antusch, S. ;

Anulli, F. ;

Apolinario, L. .

EUROPEAN PHYSICAL JOURNAL C, 2019, 79 (06)

[4] FCC-ee: The Lepton Collider: Future Circular Collider Conceptual Design Report Volume 2 [J].

Abada, A. ;

Abbrescia, M. ;

AbdusSalam, S. S. ;

Abdyukhanov, I. ;

Fernandez, J. Abelleira ;

Abramov, A. ;

Aburaia, M. ;

Acar, A. O. ;

Adzic, P. R. ;

Agrawal, P. ;

Aguilar-Saavedra, J. A. ;

Aguilera-Verdugo, J. J. ;

Aiba, M. ;

Aichinger, I. ;

Aielli, G. ;

Akay, A. ;

Akhundov, A. ;

Aksakal, H. ;

Albacete, J. L. ;

Albergo, S. ;

Alekou, A. ;

Aleksa, M. ;

Aleksan, R. ;

Fernandez, R. M. Alemany ;

Alexahin, Y. ;

Alia, R. G. ;

Alioli, S. ;

Tehrani, N. Alipour ;

Allanach, B. C. ;

Allport, P. P. ;

Altinli, M. ;

Altmannshofer, W. ;

Ambrosio, G. ;

Amorim, D. ;

Amstutz, O. ;

Anderlini, L. ;

Andreazza, A. ;

Andreini, M. ;

Andriatis, A. ;

Andris, C. ;

Andronic, A. ;

Angelucci, M. ;

Antinori, F. ;

Antipov, S. A. ;

Antonelli, M. ;

Antonello, M. ;

Antonioli, P. ;

Antusch, S. ;

Anulli, F. ;

Apolinario, L. .

EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, 2019, 228 (02) :261-623

[5] Future Physics Programme of BESIII [J].

Ablikim, M. ;

Achasov, M. N. ;

Adlarson, P. ;

Ahmed, S. ;

Albrecht, M. ;

Alekseev, M. ;

Amoroso, A. ;

An, F. F. ;

An, Q. ;

Bai, Y. ;

Bakina, O. ;

Ferroli, R. Baldini ;

Ban, Y. ;

Begzsuren, K. ;

Bennett, J., V ;

Berger, N. ;

Bertani, M. ;

Bettoni, D. ;

Bianchi, F. ;

Biernat, J. ;

Bloms, J. ;

Boyko, I ;

Briere, R. A. ;

Calibbi, L. ;

Cai, H. ;

Cai, X. ;

Calcaterra, A. ;

Cao, G. F. ;

Cao, N. ;

Cetin, S. A. ;

Chai, J. ;

Chang, J. F. ;

Chang, W. L. ;

Charles, J. ;

Chelkov, G. ;

Chen ;

Chen, G. ;

Chen, H. S. ;

Chen, J. C. ;

Chen, M. L. ;

Chen, S. J. ;

Chen, Y. B. ;

Cheng, H. Y. ;

Cheng, W. ;

Cibinetto, G. ;

Cossio, F. ;

Cui, X. F. ;

Dai, H. L. ;

Dai, J. P. ;

Dai, X. C. .

CHINESE PHYSICS C, 2020, 44 (04)

[6] B-decay discrepancies after Moriond 2019 [J].

Aebischer, Jason ;

Altmannshofer, Wolfgang ;

Guadagnoli, Diego ;

Reboud, Meril ;

Stangl, Peter ;

Straub, David M. .

EUROPEAN PHYSICAL JOURNAL C, 2020, 80 (03)

[7] Improved Measurement of the π → eν Branching Ratio [J].

Aguilar-Arevalo, A. ;

Aoki, M. ;

Blecher, M. ;

Britton, D. I. ;

Bryman, D. A. ;

vom Bruch, D. ;

Chen, S. ;

Comfort, J. ;

Ding, M. ;

Doria, L. ;

Cuen-Rochin, S. ;

Gumplinger, P. ;

Hussein, A. ;

Igarashi, Y. ;

Ito, S. ;

Kettell, S. H. ;

Kurchaninov, L. ;

Littenberg, L. S. ;

Malbrunot, C. ;

Mischke, R. E. ;

Numao, T. ;

Protopopescu, D. ;

Sher, A. ;

Sullivan, T. ;

Vavilov, D. ;

Yamada, K. .

PHYSICAL REVIEW LETTERS, 2015, 115 (07)

[8] Emerging patterns of New Physics with and without Lepton Flavour Universal contributions [J].

Alguero, Marcel ;

Capdevila, Bernat ;

Crivellin, Andreas ;

Descotes-Genon, Sebastien ;

Masjuan, Pere ;

Matias, Joaquim ;

Virto, Javier .

EUROPEAN PHYSICAL JOURNAL C, 2019, 79 (08)

[9] Right-handed charged currents in the era of the Large Hadron Collider [J].

Alioli, S. ;

Cirigliano, V. ;

Dekens, W. ;

de Vries, J. ;

Mereghetti, E. .

JOURNAL OF HIGH ENERGY PHYSICS, 2017, (05)

[10] Prospects for measurements with strange hadrons at LHCb [J].

Alves Junior, A. A. ;

Bettler, M. O. ;

Brea Rodriguez, A. ;

Casais Vidal, A. ;

Chobanova, V. ;

Cid Vidal, X. ;

Contu, A. ;

D'Ambrosio, G. ;

Dalseno, J. ;

Dettori, F. ;

Gligorov, V. V. ;

Graziani, G. ;

Guadagnoli, D. ;

Kitahara, T. ;

Lazzeroni, C. ;

Lucio Martinez, M. ;

Moulson, M. ;

Benito, C. Marin ;

Martin Camalich, J. ;

Martinez Santos, D. ;

Prisciandaro, J. ;

Navarro, A. Puig ;

Ramos Pernas, M. ;

Renaudin, V. ;

Sergi, A. ;

Zarebski, K. A. .

JOURNAL OF HIGH ENERGY PHYSICS, 2019, (05)

← 1 2 3 4 5 6 7 8 9 10 →