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SEARCH FOR A NEW LIGHT GAUGE BOSON IN DECAYS OF PI(O) AND ETA

Authors

AMSLER C ARMSTRONG DS AUGUSTIN I BAKER CA BARNETT BM BATTY CJ BEUCHERT K BIRIEN P BLUM P BOSSINGHAM R BRAUNE K BROSE J BUGG DV BURCHELL M CASE T COOPER A CROWE KM DEGENER T DIETZ HP VONDOMBROWSKI S DOSER M DUNNWEBER W ENGELHARDT D ENGLERT M FAESSLER MA FELIX C HACKMANN R HADDOCK RP HEINSIUS FH HESSEY NP HIDAS P ILLINGER P JAMNIK D JAVORFI Z KALINOWSKY H KAMMLE B KIEL T KISIEL J KLEMPT E KOBEL M KOCH H KOLO C KONIGSMANN K KUNZE M LANDUA R LOSER F LUDEMANN J MATTHAY H MERKEL M MERLO JP MEYER CA MONTANET L NOBLE A OULDSAADA F PETERS K PINDER CN PINTER G RAVNDAL S SALK J SANJARI AH SCHAFER E SCHMID B SCHMIDT P SPANIER S STRASSBURGER C STROHBUSCH U SUFFERT M URNER D VOLCKER C WALTER F WALTHER D WIEDNER U WINTER N ZOLL J ZOU B ZUPANCIC C

Citation

C. Amsler et al., SEARCH FOR A NEW LIGHT GAUGE BOSON IN DECAYS OF PI(O) AND ETA, Physics letters. Section B, 333(1-2), 1994, pp. 271-276

Citations number

Categorie Soggetti

Physics

Journal title

Physics letters. Section B → ACNP

ISSN journal

03702693

Volume

333

Issue

1-2

Year of publication

1994

Pages

271 - 276

Database

ISI

SICI code

0370-2693(1994)333:1-2<271:SFANLG>2.0.ZU;2-Z

Abstract

We have searched for new light gauge bosons produced in pi0 and eta de cays by studying the kinematically well-constrained reactions ppBAR -- > pi0pi0pi0 and ppBAR --> pi0pi0eta, where one pi0 or the eta decays t hrough the emission of a single photon recoiling against a missing sta te X (where X is a long-lived weakly interacting particle or X --> nun uBAR). No signal has been observed and branching ratio upper limits of 6 x 10(-5) at 90 % C.L. have been obtained for masses of the gauge bo son lying between approximately 65 MeV and 125 MeV (pi0 decay), and 6 x 10(-5) at 90 % C.L., for X masses between approximately 200 MeV and 525 MeV (eta decay). The pi0-decay limit represents a factor of 4 to 8 improvement when compared to the existing limit, whereas the eta deca y limit has been measured for the first time, thereby extending the m( X) range from 130 MeV up to 525 MeV.