Study of Z boson pair production in e+e- collisions at LEP at √s = 189 GeV

The pair production of Z bosons is studied using the data collected by the L3 detector at LEP in 1998 in e+e- collisions at a centre-of-mass energy of 189 GeV. All the visible final states are considered and the cross section of this process is q0.15 measured to be <math><mtext>0.74</...

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Guardado en:
Detalles Bibliográficos
Autores principales: Dova, María Teresa, L3 Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 1999
Materias:
Ciencias Exactas
Física
e+e- collision
Z boson
L3 detector
centre-of-mass energies
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78129
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:The pair production of Z bosons is studied using the data collected by the L3 detector at LEP in 1998 in e+e- collisions at a centre-of-mass energy of 189 GeV. All the visible final states are considered and the cross section of this process is q0.15 measured to be <math><mtext>0.74</mtext><msup><mi></mi><mn>+0.15</mn></msup><msub><mi></mi><mn>−0.14</mn></msub><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>(</mtext><mtext>stat.)</mtext><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>±0.04</mtext><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>(</mtext><mtext>syst.)</mtext><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>pb</mtext></math>. Final states containing b quarks are enhanced by a dedicated selection and their production cross section is found to be <math><mtext>0.18</mtext><msup><mi></mi><mn>+0.09</mn></msup><msub><mi></mi><mn>−0.07</mn></msub><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>(</mtext><mtext>stat.)</mtext><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>±0.02</mtext><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>(syst.)</mtext><mspace sp="0.2" width="2px" linebreak="nobreak" is="true"></mspace><mtext>pb</mtext></math>. Both results are in agreement with the Standard Model predictions. Limits on anomalous couplings between neutral gauge bosons are derived from these measurements.

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