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Extraction of Kaon Formfactors from K^- -> mu^- nu_mu gamma Decay at ISTRA+ Setup  [PDF]
The ISTRA+ Collaboration,:,V. A. Duk,V. N. Bolotov,A. A. Khudyakov,V. A. Lebedev,A. I. Makarov,V. P. Novikov,A. Yu. Polyarush,S. A. Akimenko,G. I. Britvich,A. P. Filin,A. V. Inyakin,I. Ya. Korolkov,V. M. Leontiev,V. F. Obraztsov,V. A. Polyakov,V. I. Romanovsky,O. G. Tchikilev,V. A. Uvarov,O. P. Yushchenko
Physics , 2010, DOI: 10.1016/j.physletb.2010.10.043
Abstract: The radiative decay K->mu nu gamma has been studied at ISTRA+ setup in a new kinematical region. About 22K events of K^- -> mu^- nu_mu gamma have been observed. The sign and value of Fv-Fa have been measured for the first time. The result is Fv-Fa=0.21(4)(4).
Up-Down Asymmetry of Neutral Current Events as a Diagnostic for Nu_mu - Nu-st Versus Nu_mu- Nu_tau Oscillations  [PDF]
John G. Learned,Sandip Pakvasa,J. L. Stone
Physics , 1998, DOI: 10.1016/S0370-2693(98)00806-5
Abstract: We show that the asymmetry in the neutral current events (e.g. Nu N -> Nu N pi^0) can be used to discriminate between Nu_mu - Nu_tau and Nu_mu - Nu_st mixing as being responsible for the atmospheric neutrino anomaly. Specifically, A_N vanishes for Nu_mu - Nu_tau mixing and is about 2/3 A_mu for Nu_mu - Nu_st mixing.
A Search for B+ to mu+ nu_mu  [PDF]
B. Aubert
Physics , 2003,
Abstract: We have performed a search for the leptonic B decay B+ --> mu+ nu_mu with data collected at the Upsilon(4S) resonance by the BABAR experiment at the PEP-II storage ring. With an integrated luminosity of approximately 81.4 fb-1 (88.4 million BBbar pairs), we find no convincing evidence for a signal and set a preliminary upper limit on the branching fraction of BR(B+ --> mu+ nu_mu) < 6.6 x 10^{-6} at the 90% confidence level.
Search for the Rare Leptonic Decay B+ --> mu+ nu_mu  [PDF]
B. Aubert,BABAR Collaboration
Physics , 2004, DOI: 10.1103/PhysRevLett.93.189902
Abstract: We have performed a search for the rare leptonic decay B+ --> mu+ nu_mu with data collected at the Upsilon(4S) resonance by the BABAR experiment at the PEP-II storage ring. In a sample of 88.4 million BBbar pairs, we find no significant evidence for a signal and set an upper limit on the branching fraction BR(B+ --> mu+ nu_mu) < 6.6 x 10^{-6} at the 90% confidence level.
Measurement of the K+ -> pi0 mu+ nu_mu gamma Branching Ratio  [PDF]
The E787 Collaboration
Statistics , 2010, DOI: 10.1103/PhysRevD.81.092001
Abstract: A measurement of the decay K+ -> pi0 mu+ nu_mu gamma has been performed with the E787 detector at Brookhaven National Laboratory. Forty events were observed in the signal region with the background expectation of (16.5 +- 2.7) events. The branching ratio was measured to be (1.58 +- 0.46(stat.) +- 0.08(syst.)) x 10^{-5}} in the kinematic region Eg >30 MeV and theta_{mu gamma} > 20degree, where Eg is the energy of the emitted photon and theta_{mu gamma} is the angle between the muon and the photon in the K+ rest frame. The results were consistent with theoretical predictions.
Evidence for nu_mu -> nu_e Oscillations from Pion Decay in Flight Neutrinos  [PDF]
LSND Collaboration,C. Athanassopoulos,L. B. Auerbach,R. L. Burman,D. O. Caldwell,E. D. Church,I. Cohen,B. D. Dieterle,J. B. Donahue,A. Fazely,F. J. Federspiel,G. T. Garvey,R. M. Gunasingha,R. Imlay,K. Johnston,H. J. Kim,W. C. Louis,R. Majkic,J. Margulies,K. McIlhany,W. Metcalf,G. B. Mills,R. A. Reeder,V. Sandberg,D. Smith,I. Stancu,W. Strossman,R. Tayloe,G. J. VanDalen,W. Vernon,N. Wadia,J. Waltz,D. H. White,D. Works,Y. Xiao,S. Yellin
Physics , 1997, DOI: 10.1103/PhysRevC.58.2489
Abstract: A search for nu_mu -> nu_e oscillations has been conducted at the Los Alamos Meson Physics Facility using nu_mu from pi^+ decay in flight. An excess in the number of beam-related events from the C(nu_e,e^-)X inclusive reaction is observed. The excess is too large to be explained by normal nu_e contamination in the beam at a confidence level greater than 99%. If interpreted as an oscillation signal, the observed oscillation probability of (2.6 +- 1.0 +- 0.5) x 10^{-3} is consistent with the previously reported nu_mu_bar -> nu_e_bar oscillation evidence from LSND.
Search for the Lepton Number Violating Process nu_mu-bar e^- -> mu^- nu_e-bar  [PDF]
NuTeV Collaboration,J. A. Formaggio,J. Yu
Physics , 2001, DOI: 10.1103/PhysRevLett.87.071803
Abstract: The NuTeV experiment at Fermilab has used a sign-selected neutrino beam to perform a search for the lepton number violating process nu_mu-bar e^- -> mu^- nu_e-bar, and to measure the cross-section of the Standard Model inverse muon decay process nu_mu e^- -> mu^- nu_e. NuTeV measures the inverse muon decay asymptotic cross-section sigma/E to be 13.8 +/- 1.2 +/- 1.4 x 10^-42 cm^2/GeV. The experiment also observes no evidence for lepton number violation and places one of the most restrictive limits on the LNV/IMD cross-section ratio at < 1.7% at 90% C.L. for V-A couplings and < 0.6% for scalar couplings.
Analysis of D+ to K- pi+ e+ nu_e and D+ to K- pi+ mu+ nu_mu Semileptonic Decays  [PDF]
CLEO Collaboration,R. A. Briere,H. Vogel,P. U. E. Onyisi,J. L. Rosner,J. P. Alexander,D. G. Cassel,S. Das,R. Ehrlich,L. Fields,L. Gibbons,S. W. Gray,D. L. Hartill,B. K. Heltsley,J. M. Hunt,D. L. Kreinick,V. E. Kuznetsov,J. Ledoux,J. R. Patterson,D. Peterson,D. Riley,A. Ryd,A. J. Sadoff,X. Shi,W. M. Sun,J. Yelton,P. Rubin,N. Lowrey,S. Mehrabyan,M. Selen,J. Wiss,M. Kornicer,R. E. Mitchell,M. R. Shepherd,C. M. Tarbert,D. Besson,T. K. Pedlar,J. Xavier,D. Cronin-Hennessy,J. Hietala,P. Zweber,S. Dobbs,Z. Metreveli,K. K. Seth,X. Ting,A. Tomaradze,S. Brisbane,J. Libby,L. Martin,A. Powell,P. Spradlin,G. Wilkinson,H. Mendez,J. Y. Ge,D. H. Miller,I. P. J. Shipsey,B. Xin,G. S. Adams,D. Hu,B. Moziak,J. Napolitano,K. M. Ecklund,J. Insler,H. Muramatsu,C. S. Park,E. H. Thorndike,F. Yang,S. Ricciardi,C. Thomas,M. Artuso,S. Blusk,S. Khalil,R. Mountain,T. Skwarnicki,S. Stone,J. C. Wang,L. M. Zhang,G. Bonvicini,D. Cinabro,A. Lincoln,M. J. Smith,P. Zhou,J. Zhu,P. Naik,J. Rademacker,D. M. Asner,K. W. Edwards,J. Reed,K. Randrianarivony,A. N. Robichaud,G. Tatishvili,E. J. White
Physics , 2010, DOI: 10.1103/PhysRevD.81.112001
Abstract: Using a large sample (~11800 events) of D^+ into K^- pi^+ e^+ nu_e and D^+ into K^- pi^+ mu^+ nu_mu decays collected by the CLEO-c detector running at the psi(3770), we measure the helicity basis form factors free from the assumptions of spectroscopic pole dominance and provide new, accurate measurements of the absolute branching fractions for D^+ into K^- pi^+ e^+ nu_e and D^+ into K^- pi^+ mu^+ nu_mu decays. We find branching fractions which are consistent with previous world averages. Our measured helicity basis form factors are consistent with the spectroscopic pole dominance predictions for the three main helicity basis form factors describing D^+ into anti-K*0 ell^+ nu_mu decay. The ability to analyze D^+ into K^- pi^+ mu^+ nu_mu allows us to make the first non-parametric measurements of the mass-suppressed form factor. Our result is inconsistent with existing Lattice QCD calculations. Finally, we measure the form factor that controls non-resonant s-wave interference with the D^+ into anti-K*0 ell^+ nu_mu amplitude and search for evidence of possible additional non-resonant d-wave or f-wave interference with the anti-K*0.
Discriminating between nu_mu <-> nu_tau and nu_mu <-> nu_sterile in atmospheric nu_mu oscillations with the Super-Kamiokande detector  [PDF]
A. Habig,for the Super-Kamiokande Collaboration
Physics , 2001,
Abstract: A strong body of evidence now exists for atmospheric nu_mu disappearance oscillations. Such disappearance could be explained by oscillations to either nu_tau or a ``sterile'' neutrino (nu_s). Super-Kamiokande uses three different methods to distinguish between these two scenarios. First, matter effects would suppress the nu_mu <-> nu_s oscillation amplitude at high energy. Second, oscillation to nu_s would reduce the overall neutral-current neutrino interaction rate. Third, the smoking gun of nu_mu <-> nu_tau oscillations would be the observation of tau appearance resulting from charged-current nu_tau interactions. The results of these three techniques are presented, which strongly favor nu_mu <-> nu_tau oscillations over nu_mu <-> nu_s.
A letter of intent for an experiment to measure nu_mu to nu_e oscillations and nu_mu disappearance at the Fermilab Booster (BooNE)  [PDF]
E. Church,I. Stancu,G. J. VanDalen,R. A. Johnson,J. M. Conrad,J. Formaggio,T. Ochs,M. H. Shaevitz,E. G. Stern,B. Tamminga,D. Smith,G. T. Garvey,W. C. Louis,G. B. Mills,V. Sandberg,R. Tayloe,D. H. White,H. J. Kim,R. Imlay,W. Metcalf,N. Wadia,Z. D. Greenwood
Physics , 1997,
Abstract: This Letter of Intent to the Fermilab Program Advisory Committee describes a search for neutrino oscillations at the Fermilab booster. It is motivated by the LSND observation of nu_mu -> nu_e appearance. The booster neutrino experiment (BooNE) will be capable of observing both nu_mu -> nu_e appearance and nu_mu disappearance. In addition, the experiment will be able to measure Delta m^2 and sin^2(2theta) and search for CP violation in the lepton sector.
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