002274859 001__ 2274859
002274859 003__ SzGeCERN
002274859 005__ 20180528111939.0
002274859 0247_ $$2DOI$$9Springer$$a10.1007/s10751-016-1367-5
002274859 0248_ $$aoai:inspirehep.net:1502419$$pcerncds:CERN$$qINSPIRE:HEP$$qForCDS
002274859 035__ $$9http://inspirehep.net/oai2d$$aoai:inspirehep.net:1502419$$d2017-07-17T15:49:59Z$$h2017-07-18T04:00:06Z$$mmarcxml
002274859 035__ $$9Inspire$$a1502419
002274859 041__ $$aeng
002274859 100__ $$aSullivan, T$$mtssulliv@triumf.ca$$uBritish Columbia U.
002274859 245__ $$9Springer$$aInitial results from the PIENU experiment
002274859 260__ $$c2017
002274859 300__ $$a5 p
002274859 520__ $$9Springer$$aThe pion branching ratio, $R_{\pi } = \frac { {\Gamma }(\pi ^{+} \rightarrow e^{+} \nu _{e} + \pi ^{+}\rightarrow e^{+} \nu _{e} \gamma )}{\Gamma (\pi ^{+} \rightarrow \mu ^{+} \nu _{\mu } + \pi ^{+} \rightarrow \mu ^{+} \nu _{\mu } \gamma )}$ , provides a sensitive test of lepton universality and constraints on many new physics scenarios. The theoretical uncertainty on the Standard Model prediction of R$_{π}$ is 0.02 %, a factor of twenty smaller than the experimental uncertainty. The analysis of a subset of data taken by the PIENU experiment will be presented. The result, R$_{π}$ = (1.2344 ± 0.0023(s t a t) ± 0.0019(s y s t)) ⋅ 10$^{−4}$ [1], is consistent with the Standard Model prediction and represents a 0.1 % constraint on lepton non-universality.
002274859 65017 $$2SzGeCERN$$aParticle Physics - Experiment
002274859 6531_ $$9author$$aPion decay
002274859 6531_ $$9author$$aLepton Universality
002274859 6531_ $$9author$$aElectroweak physics
002274859 6531_ $$9author$$aPrecision measurements
002274859 690C_ $$aCERN
002274859 693__ $$eTRIUMF 1072
002274859 700__ $$aAguilar-Arevalo, A$$uMexico U., ICN
002274859 700__ $$aAoki, M$$uOsaka U.
002274859 700__ $$aBlecher, M$$uVirginia Tech.
002274859 700__ $$aBritton, D I$$uGlasgow U.
002274859 700__ $$aBryman, D A$$uBritish Columbia U.
002274859 700__ $$aBruch, D vom$$uMainz U.
002274859 700__ $$aChen, S$$uTsinghua U., Beijing
002274859 700__ $$aComfort, J$$uArizona State U.
002274859 700__ $$aCuen-Rochin, S$$uBritish Columbia U.
002274859 700__ $$aDoria, L$$uTRIUMF
002274859 700__ $$aGumplinger, P$$uTRIUMF
002274859 700__ $$aHussein, A$$uNorthern British Columbia U.
002274859 700__ $$aIgarashi, Y$$uKEK, Tsukuba
002274859 700__ $$aIto, S$$uOsaka U.
002274859 700__ $$aKettell, S H$$uBrookhaven
002274859 700__ $$aKurchaninov, L$$uTRIUMF
002274859 700__ $$aLittenberg, L S$$uBrookhaven
002274859 700__ $$aMalbrunot, C$$uCERN
002274859 700__ $$aMischke, R E$$uTRIUMF
002274859 700__ $$aNumao, T$$uTRIUMF
002274859 700__ $$aProtopopescu, D$$uGlasgow U.
002274859 700__ $$aSher, A$$uTRIUMF
002274859 700__ $$aVavilov, D$$uTRIUMF
002274859 773__ $$c3$$n1$$pHyperfine Interact.$$v238$$wC15-06-08.5$$y2017
002274859 960__ $$a13
002274859 962__ $$b2005729$$k3$$nvictoria20150608
002274859 980__ $$aARTICLE
002274859 980__ $$aConferencePaper