Verifying the resonance schemes of unstable particles at lepton colliders
We propose practical ways of differentiating the various (Breit-Wigner, theoretical, and energy-dependent) resonance schemes of unstable particles at lepton colliders. First, the energy-dependent scheme can be distinguished from the other two by fitting the Z lineshape scan and forward-backward asym...
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| Format: | Article |
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Elsevier
2025-02-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325000292 |
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| author | Shao-Feng Ge Ui Min Zhuoni Qian |
| author_facet | Shao-Feng Ge Ui Min Zhuoni Qian |
| author_sort | Shao-Feng Ge |
| collection | DOAJ |
| description | We propose practical ways of differentiating the various (Breit-Wigner, theoretical, and energy-dependent) resonance schemes of unstable particles at lepton colliders. First, the energy-dependent scheme can be distinguished from the other two by fitting the Z lineshape scan and forward-backward asymmetries at LEP and future lepton colliders with the Z mass mZ, decay width ΓZ, and coupling strength as fitting parameters. Although the Breit-Wigner and theoretical schemes work equally well, the scheme conversion requires the decay width ΓZ to scale inversely with mZ rather than the usual linear dependence from theoretical calculation. These contradicting behaviors can be used to distinguish the Breit-Wigner and theoretical schemes by the precision Z measurements with single parameter (mZ) fit at future lepton colliders. For the WW threshold scan, its combination with the precise Fermi constant provides another way of distinguishing the Breit-Wigner and theoretical schemes. |
| format | Article |
| id | doaj-art-53298067a1264b3b8413f944d9eb6e7f |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-53298067a1264b3b8413f944d9eb6e7f2025-02-10T04:33:57ZengElsevierPhysics Letters B0370-26932025-02-01861139269Verifying the resonance schemes of unstable particles at lepton collidersShao-Feng Ge0Ui Min1Zhuoni Qian2Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University, China; Key Laboratory for Particle Astrophysics and Cosmology (MOE) & Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai 200240, China; Corresponding authors.Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University, China; Corresponding authors.School of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 311121, ChinaWe propose practical ways of differentiating the various (Breit-Wigner, theoretical, and energy-dependent) resonance schemes of unstable particles at lepton colliders. First, the energy-dependent scheme can be distinguished from the other two by fitting the Z lineshape scan and forward-backward asymmetries at LEP and future lepton colliders with the Z mass mZ, decay width ΓZ, and coupling strength as fitting parameters. Although the Breit-Wigner and theoretical schemes work equally well, the scheme conversion requires the decay width ΓZ to scale inversely with mZ rather than the usual linear dependence from theoretical calculation. These contradicting behaviors can be used to distinguish the Breit-Wigner and theoretical schemes by the precision Z measurements with single parameter (mZ) fit at future lepton colliders. For the WW threshold scan, its combination with the precise Fermi constant provides another way of distinguishing the Breit-Wigner and theoretical schemes.http://www.sciencedirect.com/science/article/pii/S0370269325000292 |
| spellingShingle | Shao-Feng Ge Ui Min Zhuoni Qian Verifying the resonance schemes of unstable particles at lepton colliders Physics Letters B |
| title | Verifying the resonance schemes of unstable particles at lepton colliders |
| title_full | Verifying the resonance schemes of unstable particles at lepton colliders |
| title_fullStr | Verifying the resonance schemes of unstable particles at lepton colliders |
| title_full_unstemmed | Verifying the resonance schemes of unstable particles at lepton colliders |
| title_short | Verifying the resonance schemes of unstable particles at lepton colliders |
| title_sort | verifying the resonance schemes of unstable particles at lepton colliders |
| url | http://www.sciencedirect.com/science/article/pii/S0370269325000292 |
| work_keys_str_mv | AT shaofengge verifyingtheresonanceschemesofunstableparticlesatleptoncolliders AT uimin verifyingtheresonanceschemesofunstableparticlesatleptoncolliders AT zhuoniqian verifyingtheresonanceschemesofunstableparticlesatleptoncolliders |