Determination of the Quadratic Slope Parameter in h ! 3p0 Decay
نویسندگان
چکیده
W. B. Tippens,1 S. Prakhov,1 C. E. Allgower,3,* V. Bekrenev,10 E. Berger,1 W. J. Briscoe,6 M. Clajus,1 J. R. Comfort,4 K. Craig,4 A. Efendiev,1 D. Grosnick,12 B. R. Holstein,9 G. M. Huber,11 D. Isenhower,2 N. Knecht,11 D. Koetke,12 A. Koulbardis,10 N. Kozlenko,10 S. Kruglov,10 G. J. Lolos,12 I. Lopatin,10 D. M. Manley,8 , A. Marušić,5 R. Manweiler,12 S. McDonald,1 B. M. K. Nefkens,1 J. Olmsted,8 Z. Papandreou,11 N. Phaisangittisakul,1 J. W. Price,1 M. Pulver,1 A. F. Ramirez,4 M. E. Sadler,2 A. Shafi,6 H. Spinka,3 S. Stanislaus,12 A. Starostin,1 and H. M. Staudenmaier7 (Crystal Ball Collaboration) 1University of California, Los Angeles, Los Angeles, California 90095-1547 2Abilene Christian University, Abilene, Texas 79699 3Argonne National Laboratory, Argonne, Illinois 60439 4Arizona State University, Tempe, Arizona 85287-1504 5Brookhaven National Laboratory, Upton, New York 11973 6George Washington University, Washington, D.C. 20052 7Universität Karlsruhe, 76128 Karlsruhe, Germany 8Kent State University, Kent, Ohio 44242 9University of Massachusetts, Amherst, Massachusetts 01003 10Petersburg Nuclear Physics Institute, Gatchina, Leningrad District 188350, Russia 11University of Regina, Regina, Saskatchewan, Canada S4S 0A2 12Valparaiso University, Valparaiso, Indiana 46383 (Received 2 March 2001; published 22 October 2001) We have determined the quadratic slope parameter a for h ! 3p0 to be a 20.031 4 from a 99% pure sample of 106h ! 3p0 decays produced in the reaction pp ! nh close to the h threshold using the Crystal Ball detector at the AGS. The result is four times more precise than the present world data and disagrees with current chiral perturbation theory calculations by about four standard deviations.
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