A measurement of the form-factor ratios in the decay ${\rm D}^+ \rightarrow \bar{\rm K}^{*0}\mu^+\nu_\mu$

The BEATRICE Collaboration:     M. Adamovich - et al.

doi:doi:10.1007/s100520050320

EPJ

A measurement of the form-factor ratios
in the decay ${\rm D}^+ \rightarrow \bar{\rm K}^{*0}\mu^+\nu_\mu$

The BEATRICE Collaboration
M.Adamovich⁵ - Y.Alexandrov⁵ - C.Angelini⁶ - D.Barberis³ - F.Ceradini⁸ - C.Cianfarani¹ - M.Dameri³ - G.Darbo³ - A.Duane⁴ - V.Flaminio⁶ - A.Forino¹ - B.R.French² - A.Frenkel⁷ - C.Gemme³ - K.Harrison⁷ - N.Hummadi⁴ - R.Hurst³ - A.Kirk² - C.Lazzeroni⁶ - L.Malferrari¹ - G.Martellotti⁷ - P.Martinengo² - P.Mazzanti¹ - J.G.McEwen⁹ - P.Nechaeva⁵ - B.Osculati³ - M.Passaseo⁷ - G.Penso⁷ - A.Quareni¹ - L.Rossi³ - M.Verzocchi⁷ - D.Websdale⁴ - M.Zavertyaev⁵

¹ Università di Bologna and INFN, Bologna, Italy
² CERN, Geneva, Switzerland
³ Università di Genova and INFN, Genoa, Italy
⁴ Blackett Laboratory, Imperial College, London, UK
⁵ Lebedev Physical Institute, Moscow, Russian Federation
⁶ Università di Pisa and INFN, Pisa, Italy
⁷ Università di Roma "La Sapienza'' and INFN, Rome, Italy
⁸ Università di Roma "Roma Tre'' and INFN, Rome, Italy
⁹ University of Southampton, Southampton, UK

Received: 10 July 1998 / Revised version: 10 August 1998 / Published online: 19 October 1998

Abstract
The form-factor ratios in the decay ${\bf {\rm D^+ \rightarrow \bar K^{*0}\mu^+\nu_\mu}}$ have been measured using a sample of 763 events produced in the WA92 fixed-target experiment. The values obtained are $\rm{R_V = 1.45 \pm 0.23 \pm 0.07, R_2 = 1.00 \pm 0.15 \pm 0.03}$ and the corresponding ratio of longitudinal to transverse polarisation is $\rm{\Gamma_L/\Gamma_T = 1.09 \pm 0.10 \pm 0.02}$ .

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EPJ

A measurement of the form-factor ratios in the decay

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A measurement of the form-factor ratios
in the decay ${\rm D}^+ \rightarrow \bar{\rm K}^{*0}\mu^+\nu_\mu$