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Bueno JF, Bayes R, Davydov YI, Depommier P, Faszer W, Gagliardi CA, Gaponenko A, Gill DR, Grossheim A, Gumplinger P, Hasinoff MD, Henderson RS, Hillairet A, Hu J, Koetke DD, MacDonald RP, Marshall GM, Mathie EL, Mischke RE, Olchanski K, Olin A, Openshaw R, Poutissou JM, Poutissou R, Selivanov V, Sheffer G, Shin B, Stanislaus TDS, Tacik R, Tribble RE. Publisher’s Note: Precise measurement of parity violation in polarized muon decay [Phys. Rev. D84, 032005 (2011)]. Int J Clin Exp Med 2012. [DOI: 10.1103/physrevd.85.039908] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Bayes R, Bueno JF, Hillairet A, Davydov YI, Depommier P, Faszer W, Gagliardi CA, Gaponenko A, Gill DR, Grossheim A, Gumplinger P, Hasinoff MD, Henderson RS, Hu J, Koetke DD, MacDonald RP, Marshall GM, Mathie EL, Mischke RE, Olchanski K, Olin A, Openshaw R, Poutissou JM, Poutissou R, Selivanov V, Sheffer G, Shin B, Stanislaus TDS, Tacik R, Tribble RE. Experimental constraints on left-right symmetric models from muon decay. Phys Rev Lett 2011; 106:041804. [PMID: 21405321 DOI: 10.1103/physrevlett.106.041804] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Indexed: 05/30/2023]
Abstract
The TWIST Collaboration has completed a new measurement of the energy-angle spectrum of positrons from the decay of highly polarized muons. A simultaneous measurement of the muon decay parameters ρ, δ, and P(μ)(π)ξ tests the standard model in a purely leptonic process and provides improved limits for relevant extensions to the standard model. Specifically, for the generalized left-right symmetric model |(g(R)/g(L))ζ|<0.020 and (g(L)/g(R))m(2)>578 GeV/c(2), both 90% C.L.
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Affiliation(s)
- R Bayes
- TRIUMF, Vancouver, British Columbia, Canada
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MacDonald RP, Bayes R, Bueno J, Davydov YI, Depommier P, Faszer W, Fujiwara MC, Gagliardi CA, Gaponenko A, Gill DR, Grossheim A, Gumplinger P, Hasinoff MD, Henderson RS, Hillairet A, Hu J, Jamieson B, Kitching P, Koetke DD, Marshall GM, Mathie EL, Mischke RE, Musser JR, Nozar M, Olchanski K, Olin A, Openshaw R, Poutissou JM, Poutissou R, Quraan MA, Selivanov V, Sheffer G, Shin B, Stanislaus TDS, Tacik R, Tribble RE. Precision measurement of the muon decay parametersρandδ. Int J Clin Exp Med 2008. [DOI: 10.1103/physrevd.78.032010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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5
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Tanihata I, Alcorta M, Bandyopadhyay D, Bieri R, Buchmann L, Davids B, Galinski N, Howell D, Mills W, Mythili S, Openshaw R, Padilla-Rodal E, Ruprecht G, Sheffer G, Shotter AC, Trinczek M, Walden P, Savajols H, Roger T, Caamano M, Mittig W, Roussel-Chomaz P, Kanungo R, Gallant A, Notani M, Savard G, Thompson IJ. Measurement of the two-halo neutron transfer reaction (1)H((11)Li, (9)Li)(3)H at 3A MeV. Phys Rev Lett 2008; 100:192502. [PMID: 18518445 DOI: 10.1103/physrevlett.100.192502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Indexed: 05/26/2023]
Abstract
The p((11)Li, (9)Li)t reaction has been studied for the first time at an incident energy of 3A MeV at the new ISAC-2 facility at TRIUMF. An active target detector MAYA, built at GANIL, was used for the measurement. The differential cross sections have been determined for transitions to the (9)Li ground and first excited states in a wide range of scattering angles. Multistep transfer calculations using different (11)Li model wave functions show that wave functions with strong correlations between the halo neutrons are the most successful in reproducing the observation.
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Jamieson B, Bayes R, Davydov YI, Depommier P, Doornbos J, Faszer W, Fujiwara MC, Gagliardi CA, Gaponenko A, Gill DR, Gumplinger P, Hasinoff MD, Henderson RS, Hu J, Kitching P, Koetke DD, Macdonald JA, MacDonald RP, Marshall GM, Mathie EL, Mischke RE, Musser JR, Nozar M, Olchanski K, Olin A, Openshaw R, Porcelli TA, Poutissou JM, Poutissou R, Quraan MA, Rodning NL, Selivanov V, Sheffer G, Shin B, Stanislaus TDS, Tacik R, Torokhov VD, Tribble RE, Vasiliev MA. Measurement ofPμξin polarized muon decay. Int J Clin Exp Med 2006. [DOI: 10.1103/physrevd.74.072007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Musser JR, Bayes R, Davydov YI, Depommier P, Doornbos J, Faszer W, Gagliardi CA, Gaponenko A, Gill DR, Green P, Gumplinger P, Hasinoff MD, Henderson RS, Hu J, Jamieson B, Kitching P, Koetke DD, Krushinsky AA, Lachin YY, Macdonald JA, MacDonald RP, Marshall GM, Mathie EL, Miasoedov LV, Mischke RE, Nord PM, Olchanski K, Olin A, Openshaw R, Porcelli TA, Poutissou JM, Poutissou R, Quraan MA, Rodning NL, Selivanov V, Sheffer G, Shin B, Sobratee F, Stanislaus TDS, Tacik R, Torokhov VD, Tribble RE, Vasiliev MA, Wright DH. Measurement of the Michel parameter rho in muon decay. Phys Rev Lett 2005; 94:101805. [PMID: 15783475 DOI: 10.1103/physrevlett.94.101805] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2004] [Indexed: 05/24/2023]
Abstract
The TWIST Collaboration has measured the Michel parameter rho in normal muon decay, mu(+)--> e(+)nu(e)nu (mu). In the standard model, rho = 3/4. Deviations from this value imply mixing of left- and right-handed muon and electron couplings. We find rho=0.750 80+/-0.000 32(stat) +/- 0.000 97(syst) +/- 0.000 23, where the last uncertainty represents the dependence of rho on the Michel parameter eta. This result sets new limits on the W(L)-W(R) mixing angle in left-right symmetric models.
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Affiliation(s)
- J R Musser
- Texas A&M University, College Station, Texas 77843, USA
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Rodning N, Andersson W, Davydov Y, Depommier P, Doornbos J, Faszer W, Gagliardi C, Gaponenko A, Gill D, Green P, Gumplinger P, Hardy J, Hasinoff M, Helmer R, Henderson R, Kitching P, Koetke D, Korkmaz E, Khruchinsky A, Maas D, Macdonald J, MacDonald R, Manweiler R, Marshall G, Mathie T, Musser J, Nord P, Olin A, Openshaw R, Ottewell D, Porcelli T, Poutissou JM, Poutissou R, Price G, Quraan M, Schaapman J, Selivanov V, Sheffer G, Shin B, Sobratee F, Soukup J, Stanislaus T, Stinson G, Tacik R, Torokhov V, Tribble R, Vasiliev M, Walter HC, Wang SC, Wright D. TWIST- The TRIUMF weak interaction symmetry test the Michel parameters from μ+ decay. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0920-5632(01)01232-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Airapetian A, Akopov N, Amarian M, Aschenauer EC, Avakian H, Avakian R, Avetissian A, Avetissian E, Bains B, Baumgarten C, Beckmann M, Belostotski S, Belz JE, Benisch T, Bernreuther S, Bianchi N, Blouw J, Böttcher H, Borissov A, Bouwhuis M, Brack J, Brauksiepe S, Braun B, Bray B, Brons S, Brückner W, Brüll A, Bruins EEW, Bulten HJ, Capitani GP, Carter P, Chumney P, Cisbani E, Court GR, Dalpiaz PF, De Sanctis E, De Schepper D, Devitsin E, de Witt Huberts PKA, Di Nezza P, Düren M, Dvoredsky A, Elbakian G, Ely J, Fantoni A, Fechtchenko A, Ferstl M, Fiedler K, Filippone BW, Fischer H, Fox B, Franz J, Frullani S, Funk MA, Gärber Y, Gao H, Garibaldi F, Gavrilov G, Geiger P, Gharibyan V, Golendukhin A, Graw G, Grebeniouk O, Green PW, Greeniaus LG, Grosshauser C, Guidal M, Gute A, Gyurjyan V, Haas JP, Haeberli W, Hansen JO, Hartig M, Hasch D, Häusser O, Heinsius FH, Henderson R, Henoch M, Hertenberger R, Holler Y, Holt RJ, Hoprich W, Ihssen H, Iodice M, Izotov A, Jackson HE, Jgoun A, Kaiser R, Kinney E, Kisselev A, Kitching P, Kobayashi H, Koch N, Königsmann K, Kolstein M, Kolster H, Korotkov V, Korsch W, Kozlov V, Kramer LH, Krivokhijine VG, Kurisuno M, Kyle G, Lachnit W, Lenisa P, Lorenzon W, Makins NCR, Martens FK, Martin JW, Masoli F, Mateos A, McAndrew M, McIlhany K, McKeown RD, Meissner F, Menden F, Metz A, Meyners N, Mikloukho O, Miller CA, Miller MA, Milner R, Most A, Muccifora V, Mussa R, Nagaitsev A, Naryshkin Y, Nathan AM, Neunreither F, Niczyporuk M, Nowak WD, Nupieri M, Oganessyan KA, O'Neill TG, Openshaw R, Ouyang J, Owen BR, Papavassiliou V, Pate SF, Pitt M, Potashov S, Potterveld DH, Rakness G, Reali A, Redwine R, Reolon AR, Ristinen R, Rith K, Rossi P, Rudnitsky S, Ruh M, Ryckbosch D, Sakemi Y, Savin I, Scarlett C, Schäfer A, Schmidt F, Schmitt H, Schnell G, Schüler KP, Schwind A, Seibert J, Shibata TA, Shibatani K, Shin T, Shutov V, Simani C, Simon A, Sinram K, Slavich P, Spengos M, Steffens E, Stenger J, Stewart J, Stoesslein U, Sutter M, Tallini H, Taroian S, Terkulov A, Teryaev O, Thomas E, Tipton B, Tytgat M, Urciuoli GM, van den Brand JFJ, van der Steenhoven G, van de Vyver R, van Hunen JJ, Vetterli MC, Vikhrov V, Vincter MG, Visser J, Volk E, Wander W, Wendland J, Williamson SE, Wise T, Woller K, Yoneyama S, Zohrabian H. Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction. Phys Rev Lett 2000; 84:4047-4051. [PMID: 10990607 DOI: 10.1103/physrevlett.84.4047] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/1999] [Indexed: 05/23/2023]
Abstract
Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distribution in the azimuthal angle straight phi of the pion relative to the lepton scattering plane was formed for pi(+) electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power in the sinstraight phi moment of the cross section is 0.022+/-0.005+/-0.003. This result can be interpreted as the effect of terms in the cross section involving chiral-odd spin distribution functions in combination with a chiral-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark.
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McIlhany K, McKeown RD, Meissner F, Menden FM, Metz A, Meyners N, Mikloukho O, Miller CA, Miller MA, Milner R, Most A, Muccifora V, Naryshkin Y, Nathan AM, Neunreither F, Niczyporuk M, Nowak W, O'Neill TG, Openshaw R, Ouyang J, Owen BR, Pate SF, Potashov S, Potterveld DH, Rakness G, Redwine R. Measurement of the spin asymmetry in the photoproduction of pairs of high- p(T) hadrons at HERMES. Phys Rev Lett 2000; 84:2584-2588. [PMID: 11017275 DOI: 10.1103/physrevlett.84.2584] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/1999] [Indexed: 05/23/2023]
Abstract
We present a measurement of the longitudinal spin asymmetry A(||) in photoproduction of pairs of hadrons with high transverse momentum p(T). Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h(+)h(-) pairs with p(h(1))(T)>1.5 GeV/c and p(h(2))(T)>1.0 GeV/c, the measured asymmetry is A(||) = -0. 28+/-0.12(stat)+/-0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering from protons, and is interpreted to arise from a positive gluon polarization.
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Affiliation(s)
- K McIlhany
- Yerevan Physics Institute, 375036, Yerevan, Armenia
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