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Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60
The NA60 experiment studied low-mass muon pair production in proton–nucleus (p–A) collisions using a 400 GeV proton beam at the CERN SPS. The low-mass dimuon spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons η , ρ , ω , η′ and ϕ , and no ev...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2016
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2016.04.013 http://cds.cern.ch/record/2150004 |
| _version_ | 1780950457905053696 |
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| author | Arnaldi, R. Banicz, K. Borer, K. Castor, J. Chaurand, B. Chen, W. Cicalò, C. Colla, A. Cortese, P. Damjanovic, S. David, A. de Falco, A. Devaux, A. Ducroux, L. En'yo, H. Fargeix, J. Ferretti, A. Floris, M. Förster, A. Force, P. Guettet, N. Guichard, A. Gulkanian, H. Heuser, J.M. Jarron, P. Keil, M. Kluberg, L. Li, Z. Lourenço, C. Lozano, J. Manso, F. Martins, P. Masoni, A. Neves, A. Ohnishi, H. Oppedisano, C. Parracho, P. Pillot, P. Poghosyan, T. Puddu, G. Radermacher, E. Ramalhete, P. Rosinsky, P. Scomparin, E. Seixas, J. Serci, S. Shahoyan, R. Sonderegger, P. Specht, H.J. Tieulent, R. Uras, A. Usai, G. Veenhof, R. Wöhri, H.K. |
| author_facet | Arnaldi, R. Banicz, K. Borer, K. Castor, J. Chaurand, B. Chen, W. Cicalò, C. Colla, A. Cortese, P. Damjanovic, S. David, A. de Falco, A. Devaux, A. Ducroux, L. En'yo, H. Fargeix, J. Ferretti, A. Floris, M. Förster, A. Force, P. Guettet, N. Guichard, A. Gulkanian, H. Heuser, J.M. Jarron, P. Keil, M. Kluberg, L. Li, Z. Lourenço, C. Lozano, J. Manso, F. Martins, P. Masoni, A. Neves, A. Ohnishi, H. Oppedisano, C. Parracho, P. Pillot, P. Poghosyan, T. Puddu, G. Radermacher, E. Ramalhete, P. Rosinsky, P. Scomparin, E. Seixas, J. Serci, S. Shahoyan, R. Sonderegger, P. Specht, H.J. Tieulent, R. Uras, A. Usai, G. Veenhof, R. Wöhri, H.K. |
| author_sort | Arnaldi, R. |
| collection | CERN |
| description | The NA60 experiment studied low-mass muon pair production in proton–nucleus (p–A) collisions using a 400 GeV proton beam at the CERN SPS. The low-mass dimuon spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons η , ρ , ω , η′ and ϕ , and no evidence of in-medium effects is found. A new high-precision measurement of the electromagnetic transition form factors of the η and ω was performed, profiting from a 10 times larger data sample than the peripheral In–In sample previously collected by NA60. Using the pole-parameterisation |F(M)|2=(1−M2/Λ2)−2 we find Λη−2=1.934±0.067 (stat.) ±0.050 (syst.) (GeV/c2)−2 and Λω−2=2.223±0.026 (stat.) ±0.037 (syst.) (GeV/c2)−2 . An improved value of the branching ratio of the Dalitz decay ω→μ+μ−π0 is also obtained, with BR(ω→μ+μ−π0)=[1.41±0.09 (stat.)±0.15 (syst.)]×10−4 . Further results refer to the ρ line shape and a new limit on ρ/ω interference in hadron interactions. |
| id | oai-inspirehep.net-1452485 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2016 |
| record_format | invenio |
| spelling | oai-inspirehep.net-14524852022-08-10T12:35:59Zdoi:10.1016/j.physletb.2016.04.013http://cds.cern.ch/record/2150004engArnaldi, R.Banicz, K.Borer, K.Castor, J.Chaurand, B.Chen, W.Cicalò, C.Colla, A.Cortese, P.Damjanovic, S.David, A.de Falco, A.Devaux, A.Ducroux, L.En'yo, H.Fargeix, J.Ferretti, A.Floris, M.Förster, A.Force, P.Guettet, N.Guichard, A.Gulkanian, H.Heuser, J.M.Jarron, P.Keil, M.Kluberg, L.Li, Z.Lourenço, C.Lozano, J.Manso, F.Martins, P.Masoni, A.Neves, A.Ohnishi, H.Oppedisano, C.Parracho, P.Pillot, P.Poghosyan, T.Puddu, G.Radermacher, E.Ramalhete, P.Rosinsky, P.Scomparin, E.Seixas, J.Serci, S.Shahoyan, R.Sonderegger, P.Specht, H.J.Tieulent, R.Uras, A.Usai, G.Veenhof, R.Wöhri, H.K.Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60Nuclear Physics - ExperimentThe NA60 experiment studied low-mass muon pair production in proton–nucleus (p–A) collisions using a 400 GeV proton beam at the CERN SPS. The low-mass dimuon spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons η , ρ , ω , η′ and ϕ , and no evidence of in-medium effects is found. A new high-precision measurement of the electromagnetic transition form factors of the η and ω was performed, profiting from a 10 times larger data sample than the peripheral In–In sample previously collected by NA60. Using the pole-parameterisation |F(M)|2=(1−M2/Λ2)−2 we find Λη−2=1.934±0.067 (stat.) ±0.050 (syst.) (GeV/c2)−2 and Λω−2=2.223±0.026 (stat.) ±0.037 (syst.) (GeV/c2)−2 . An improved value of the branching ratio of the Dalitz decay ω→μ+μ−π0 is also obtained, with BR(ω→μ+μ−π0)=[1.41±0.09 (stat.)±0.15 (syst.)]×10−4 . Further results refer to the ρ line shape and a new limit on ρ/ω interference in hadron interactions.The NA60 experiment studied low-mass muon pair production in proton-nucleus (p-A) collisions using a 400~GeV proton beam at the CERN SPS. The low-mass dimuon spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons $\eta$, $\rho$, $\omega$, $\eta'$ and $\phi$, and no evidence of in-medium effects is found. A new high-precision measurement of the electromagnetic transition form factors of the $\eta$ and $\omega$ was performed, profiting from a 10~times larger data sample than the peripheral In-In sample previously collected by NA60. Using the pole-parameterisation $|F(M)|^2 = (1 -M^2/\mathrm{\Lambda}^2)^{-2}$ we find $\mathrm{\Lambda}_\eta^{-2} = 1.934\ \pm\ 0.067$~(stat.) $\pm\ 0.050$~(syst.)~(GeV/$c^2$)$^{-2}$ and $\mathrm{\Lambda}_\omega^{-2} = 2.223\ \pm\ 0.026$~(stat.) $\pm\ 0.037$~(syst.)~(GeV/$c^2$)$^{-2}$. An improved value of the branching ratio of the Dalitz decay $\omega \to \mu^+\mu^-\pi^0$ is also obtained, with $BR(\omega \to \mu^+\mu^-\pi^0) = [1.41~\pm~0.09~\mathrm{(stat.)}$ $\pm~0.15~\mathrm{(syst.)}] \times 10^{-4}$. Further results refer to the $\rho$ line shape and a new limit on $\rho/\omega$ interference in hadron interactions.arXiv:1608.07898oai:inspirehep.net:14524852016-08-28 |
| spellingShingle | Nuclear Physics - Experiment Arnaldi, R. Banicz, K. Borer, K. Castor, J. Chaurand, B. Chen, W. Cicalò, C. Colla, A. Cortese, P. Damjanovic, S. David, A. de Falco, A. Devaux, A. Ducroux, L. En'yo, H. Fargeix, J. Ferretti, A. Floris, M. Förster, A. Force, P. Guettet, N. Guichard, A. Gulkanian, H. Heuser, J.M. Jarron, P. Keil, M. Kluberg, L. Li, Z. Lourenço, C. Lozano, J. Manso, F. Martins, P. Masoni, A. Neves, A. Ohnishi, H. Oppedisano, C. Parracho, P. Pillot, P. Poghosyan, T. Puddu, G. Radermacher, E. Ramalhete, P. Rosinsky, P. Scomparin, E. Seixas, J. Serci, S. Shahoyan, R. Sonderegger, P. Specht, H.J. Tieulent, R. Uras, A. Usai, G. Veenhof, R. Wöhri, H.K. Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60 |
| title | Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60 |
| title_full | Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60 |
| title_fullStr | Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60 |
| title_full_unstemmed | Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60 |
| title_short | Precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in NA60 |
| title_sort | precision study of the $\eta \to \mu \mu \gamma$ and $\omega \to \mu + \mu \mu \pi^0$ electromagnetic transition form-factors and of the $\rho \to \mu \mu$ line shape in na60 |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1016/j.physletb.2016.04.013 http://cds.cern.ch/record/2150004 |
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