Measurement of the running of the fine-structure constant

Small-angle Bhabha scattering data recorded at the Z resonance and large-angle Bhabha scattering data recorded at 's s189 GeV by the L3 detector at LEP are used to measure the running of the effective fine-structure constant for spacelike momentum transfers. The results are <math><...

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Guardado en:
Detalles Bibliográficos
Autores principales: Dova, María Teresa, L3 Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Exactas
Física
fine-structure
Bhabha scattering data
LEP
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/75551
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:Small-angle Bhabha scattering data recorded at the Z resonance and large-angle Bhabha scattering data recorded at 's s189 GeV by the L3 detector at LEP are used to measure the running of the effective fine-structure constant for spacelike momentum transfers. The results are <math><mtext>α</mtext><msup><mi></mi><mn>−1</mn></msup><mtext>(−2.1</mtext><mspace sp="0.4" width="2px" linebreak="nobreak" is="true"></mspace><mtext>GeV</mtext><msup><mi></mi><mn>2</mn></msup><mtext>)−α</mtext><msup><mi></mi><mn>−1</mn></msup><mtext>(−6.25</mtext><mspace sp="0.4" width="2px" linebreak="nobreak" is="true"></mspace><mtext>GeV</mtext><msup><mi></mi><mn>2</mn></msup><mtext>)=0.78±0.26</mtext></math> <math><mtext>α</mtext><msup><mi></mi><mn>−1</mn></msup><mtext>(−12.25</mtext><mspace sp="0.4" width="2px" linebreak="nobreak" is="true"></mspace><mtext>GeV</mtext><msup><mi></mi><mn>2</mn></msup><mtext>)−α</mtext><msup><mi></mi><mn>−1</mn></msup><mtext>(−3434</mtext><mspace sp="0.4" width="2px" linebreak="nobreak" is="true"></mspace><mtext>GeV</mtext><msup><mi></mi><mn>2</mn></msup><mtext>)=3.80±1.29,</mtext></math> in agreement with theoretical predictions.

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