Abstract
The PEN Collaboration is conducting a new measurement of the π+ → e + vL branching ratio at the Paul Scherrer Institute, with the goal uncertainty of δB/B πe2 = 5 × 10−4 or lower. At present, the combined accuracy of all published πe2 decay measurements lags behind the theoretical calculation by a factor of 40. In this contribution we report on the PEN detector configuration and its performance during two development runs done in 2007 and 2008.
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References
PEN Collaboration: Precise Measurement of the π+ → e + v Branching Ratio. Paul Scherrer Institute Proposal R-05-01. Available at http://pen.phys.virginia.edu/proposal/ pen_proposal.pdf.
W. J. Marciano, A. Sirlin: Radiative corrections to πl2 decays. Phys. Rev. Lett. 71, 3629–3632 (1993)
M. Finkemeier: Radiative corrections to πl2 and K l2 decays. Phys. Lett. B 387, 391–394 (1996)
V. Cirigliano, I. Rosell: Two-Loop Effective Theory Analysis of π(K) → eve[γ] Branching Ratios. Phys. Rev. Lett. 99, 231801–231804 (2007)
D.I. Britton, S. Ahmad, D.A. Bryman, R.A. Burnham, E.T.H. Clifford, P. Kitching, Y. Kuno, J.A. Macdonald, T. Numao, A. Olin, J-M. Poutissou, M.S. Dixit: Measurement of the π+→ e + v branching ratio. Phys. Rev. Lett. 68, 3000–3003 (1992)
G. Czapek, A. Federspiel, A. Flükiger, D. Frei, B. Hahn, C. Hug, E. Hugentobler, W. Krebs, U. Moser, D. Muster, E. Ramseyer, H. Scheidiger, P. Schlatter, G. Stucki, R. Abela, D. Renker, E. Steiner: Branching ratio for the rare pion decay into positron and neutrino. Phys. Rev. Lett. 70, 17–20 (1993)
D.A. Bryman, π→ ev decay: window on the generation puzzle. Comments Nucl. Part. Phys. 21, 101–122 (1993)
A. Masiero, P. Paradisi, R. Petronzio, Probing new physics through μ-e universality in K→ l v. Phys. Rev. D 74, 011701–011705(R) (2006)
E. Frle ž, D. Počanić, Assamagan, et al.: Design, commissioning and performance of the PI-BETA detector at PSI. Nucl. Inst. and Meth. A 526, 300–347 (2004)
E. Frlež, D. Počanić, V. A. Baranov, et al.: Precise Measurement of the Pion Axial Form Factor in the π+→ e + veγ Decay. Phys. Rev. Lett. 93, 181804-1-4 (2004)
D. Pocanic,, E. Frlez, V.A. Baranov, et al.: Precise Measurement of the π+→ π0 e + v Branching Ratio. Phys. Rev. Lett. 93, 181803-1-4 (2004)
M. Bychkov, D. Pocanic, B.A. VanDevender, et al.: New Precise Measurement of the Pion Weak Form Factors in the π+→ e + vγ Decay. hep-ph arXiv:0804.1815v1 (2008)
PEN Collaboration Home Page, http://pen.phys.virginia.edu/.
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Frlež, E. et al. (2009). Precise Measurement of the π+ → e + v Branching Ratio. In: Begun, V., Jenkovszky, L.L., Polański, A. (eds) Progress in HighEnergy Physics and Nuclear Safety. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2287-5_10
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DOI: https://doi.org/10.1007/978-90-481-2287-5_10
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