تقرير
Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling $g_P$
| العنوان: | Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling $g_P$ |
|---|---|
| المؤلفون: | Andreev, V. A., Banks, T. I., Case, T. A., Chitwood, D. B., Clayton, S. M., Crowe, K. M., Deutsch, J., Egger, J., Freedman, S. J., Ganzha, V. A., Gorringe, T., Gray, F. E., Hertzog, D. W., Hildebrandt, M., Kammel, P., Kiburg, B., Knaack, S., Kravtsov, P. A., Krivshich, A. G., Lauss, B., Lynch, K. L., Maev, E. M., Maev, O. E., Mulhauser, F., Özben, C. S., Petitjean, C., Petrov, G. E., Prieels, R., Schapkin, G. N., Semenchuk, G. G., Soroka, M. A., Tishchenko, V., Vasilyev, A. A., Vorobyov, A. A., Vznuzdaev, M. E., Winter, P. |
| المصدر: | Phys.Rev.Lett.99:032002,2007 |
| سنة النشر: | 2007 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | The rate of nuclear muon capture by the proton has been measured using a new experimental technique based on a time projection chamber operating in ultra-clean, deuterium-depleted hydrogen gas at 1 MPa pressure. The capture rate was obtained from the difference between the measured $\mu^-$ disappearance rate in hydrogen and the world average for the $\mu^+$ decay rate. The target's low gas density of 1% compared to liquid hydrogen is key to avoiding uncertainties that arise from the formation of muonic molecules. The capture rate from the hyperfine singlet ground state of the $\mu p$ atom is measured to be $\Lambda_S=725.0 \pm 17.4 s^{-1}$, from which the induced pseudoscalar coupling of the nucleon, $g_P(q^2=-0.88 m_\mu^2)=7.3 \pm 1.1$, is extracted. This result is consistent with theoretical predictions for $g_P$ that are based on the approximate chiral symmetry of QCD. Comment: submitted to Phys.Rev.Lett |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.99.032002 |
| URL الوصول: | http://arxiv.org/abs/0704.2072 |
| رقم الأكسشن: | edsarx.0704.2072 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.99.032002 |
|---|