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Titolo:
HADRONIC TRANSITIONS Y(2S)-]Y(1S) - ART. NO. 052004
Autore:
ALEXANDER JP; BAKER R; BEBEK C; BERGER BE; BERKELMAN K; BLOOM K; BOISVERT V; CASSEL DG; CROWCROFT DS; DICKSON M; VONDOMBROWSKI S; DRELL PS; ECKLUND KM; EHRLICH R; FOLAND AD; GAIDAREV P; GALIK RS; GIBBONS L; GITTELMAN B; GRAY SW; HARTILL DL; HELTSLEY BK; HOPMAN PI; KANDASWAMY J; KIM PC; KREINICK DL; LEE T; LIU Y; MISTRY NB; NG CR; NORDBERG E; OGG M; PATTERSON JR; PETERSON D; RILEY D; SOFFER A; VALANTSPAIGHT B; WARD C; ATHANAS M; AVERY P; JONES CD; LOHNER M; PATTON S; PRESCOTT C; YELTON J; ZHENG J; BRANDENBURG G; BRIERE RA; ERSHOV A; GAO YS; KIM DYJ; WILSON R; YAMAMOTO H; BROWDER TE; LI Y; RODRIGUEZ JL; BERGFELD T; EISENSTEIN BI; ERNST J; GLADDING GE; GOLLIN GD; HANS RM; JOHNSON E; KARLINER I; MARSH MA; PALMER M; SELEN M; THALER JJ; EDWARDS KW; BELLERIVE A; JANICEK R; MACFARLANE DB; PATEL PM; SADOFF AJ; AMMAR R; BARINGER P; BEAN A; BESSON D; COPPAGE D; DARLING C; DAVIS R; KOTOV S; KRAVCHENKO I; KWAK N; ZHOU L; ANDERSON S; KUBOTA Y; LEE SJ; ONEILL JJ; POLING R; RIEHLE T; SMITH A; ALAM MS; ATHAR SB; LING Z; MAHMOOD AH; TIMM S; WAPPLER F; ANASTASSOV A; DUBOSCQ JE; FUJINO D; GAN KK; HART T; HONSCHEID K; KAGAN H; KASS R; LEE J; SPENCER MB; SUNG M; UNDRUS A; WANKE R; WOLF A; ZOELLER MM; NEMATI B; RICHICHI SJ; ROSS WR; SEVERINI H; SKUBIC P; BISHAI M; FAST J; HINSON JW; MENON N; MILLER DH; SHIBATA EI; SHIPSEY IPJ; YURKO M; GLENN S; JOHNSON SD; KWON Y; ROBERTS S; THORNDIKE EH; JESSOP CP; LINGEL K; MARSISKE H; PERL ML; SAVINOV V; UGOLINI D; WANG R; ZHOU X; COAN TE; FADEYEV V; KOROLKOV I; MARAVIN Y; NARSKY I; SHELKOV V; STAECK J; STROYNOWSKI R; VOLOBOUEV I; YE J; ARTUSO M; AZFAR F; EFIMOV A; GOLDBERG M; HE D; KOPP S; MONETI GC; MOUNTAIN R; SCHUH S; SKWARNICKI T; STONE S; VIEHHAUSER G; XING X; BARTELT J; CSORNA SE; JAIN V; MCLEAN KW; MARKA S; GODANG R; KINOSHITA K; LAI IC; POMIANOWSKI P; SCHRENK S; BONVICINI G; CINABRO D; GREENE R; PERERA LP; ZHOU GJ; CHADHA M; CHAN S; EIGEN G; MILLER JS; OGRADY C; SCHMIDTLER M; URHEIM J; WEINSTEIN AJ; WURTHWEIN F; BLISS DW; MASEK G; PAAR HP; PRELL S; SHARMA V; ASNER DM; GRONBERG J; HILL TS; LANGE DJ; MORRISON RJ; NELSON HN; NELSON TK; ROBERTS D; RYD A; BALEST R; BEHRENS BH; FORD WT; GRITSAN A; PARK H; ROY J; SMITH JG;
Indirizzi:
CORNELL UNIV ITHACA NY 14853 UNIV FLORIDA GAINESVILLE FL 32611 HARVARD UNIV CAMBRIDGE MA 02138 UNIV HAWAII MANOA HONOLULU HI 96822 UNIV ILLINOIS URBANA IL 61801 CARLETON UNIV OTTAWA ON K1S 5B6 CANADA INST PARTICLE PHYS MONTREAL PQ CANADA MCGILL UNIV MONTREAL PQ H3A 2T8 CANADA ITHACA COLL ITHACA NY 14850 UNIV KANSAS LAWRENCE KS 66045 UNIV MINNESOTA MINNEAPOLIS MN 55455 SUNY ALBANY ALBANY NY 12222 OHIO STATE UNIV COLUMBUS OH 43210 UNIV OKLAHOMA NORMAN OK 73019 PURDUE UNIV W LAFAYETTE IN 47907 UNIV ROCHESTER ROCHESTER NY 14627 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR STANFORD CA 94309 SO METHODIST UNIV DALLAS TX 75275 SYRACUSE UNIV SYRACUSE NY 13244 VANDERBILT UNIV NASHVILLE TN 37235 VIRGINIA POLYTECH INST & STATE UNIV BLACKSBURG VA 24061 WAYNE STATE UNIV DETROIT MI 48202 CALTECH PASADENA CA 91125 UNIV CALIF SAN DIEGO LA JOLLA CA 92093 UNIV CALIF SANTA BARBARA SANTA BARBARA CA 93106 UNIV COLORADO BOULDER CO 80309 UNIV TEXAS AUSTIN TX 78712 LAWRENCE LIVERMORE NATL LAB LIVERMORE CA 94551 BINP RU-630090 NOVOSIBIRSK RUSSIA YONSEI UNIV SEOUL 120749 SOUTH KOREA BROOKHAVEN NATL LAB UPTON NY 11973
Titolo Testata:
Physical review. D. Particles and fields
fascicolo: 5, volume: 5805, anno: 1998,
pagine: 2004 -
SICI:
0556-2821(1998)5805:5<2004:HTY-AN>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
UPPER LIMIT; DECAY; SYSTEM; STATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
J.P. Alexander et al., "HADRONIC TRANSITIONS Y(2S)-]Y(1S) - ART. NO. 052004", Physical review. D. Particles and fields, 5805(5), 1998, pp. 2004

Abstract

Using a 73.6 pb(-1) data sample of Y(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Y(2S) and the T(1S). The dipion transition Y(2S)-->Y(1S) pi(+)pi(-) was studied using two differentanalysis techniques. Selecting events in which Y(1S)-->e(+)e(-), mu(+)mu(-) (''exclusive'' analysis), and using the Y(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Y(2S)-->Y(1S) pi(+)pi(-)) = 0.189 +/- 0.004 +/- 0.010, while using a method allowing T(1S)-->anything (''inclusive'' analysis) we obtained B(Y(2S) -->Y(1S)pi(+)pi(-)) = 0.196 +/- 0.002 +/- 0.010. The appropriate weighted average of the two measurements gives a(T(2S) --> Y(1S) pi(+)pi(-))= 0.192 +/- 0.002 +/- 0.010. Combining the exclusive and inclusive results we derive the T(1S) leptonic branching fractions B-ee = 0.0229 +/- 0.0008 +/- 0.0011 and B-mu mu = 0.0249 +/- 0.0008 +/- 0.0013. We also studied Y(2S)-->Y(1S) pi(o)pi(o) and obtained B(Y(2S)-->Y(1S) pi(o)pi(o))= 0.092 +/- 0.006 +/- 0.008. Parameters of the pi pi system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the eta and single pi(o) transitions and obtained the 90% confidence level upper limits B(Y(2S)-->(1S) eta)<0.0028 and B(Y(2S)-->(1S) pi(o))<0.0011. [S0556-2821(98)07417-7].

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Documento generato il 26/11/20 alle ore 20:03:43