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14 results on '"Shatunov, YM"'

1. New measurement of the anomalous magnetic moment of the positive muon

Author

Carey, RM, Earle, W, Efstathiadis, E, Hare, MF, Hazen, ES, Hughes, BJ, Krienen, F, Miller, JP, Monich, Ouyang, J, Rind, O, Roberts, BL, Sulak, LR, Trofimov, A, Varner, G, Worstell, WA, Benedict, E, Logashenko, I., Benante, J, Brown, HN, Bunce, G, Cullen, J, Danby, GT, Geller, J, Hseuh, H, Jackson, JW, Jia, L, Kochis, S, Larsen, R, Lee, YY, Mapes, M, Meng, W, Morse, WM, Pai, C, Pearson, C, Polk, T., Prigl, R, Rankowitz, S, Sandberg, J, Semertzidis, YK, Shutt, R, Snydstrup, L, Soukas, A, Stillman, A, Tallerico, T, Tanaka, M, Toldo, F, von Lintig, D, Warburton, D, Woodle, K, Chertovskikh, A, Druzhinin, VP, Fedotovich, GV, Grigorev, DN, Golubev, VB, Khazin, BI, Maksimov, A, Merzliakov, Y, Ryskulov, N, Serednyakov, S, Shatunov, YM, Solodov, E, Orlov, Y, Winn, D, Grossmann, A, Gerhaeuser, J, Jungmann, K, von Walter, P, zu Putlitz, G, Bunker, B, Deninger, W, Debevec, PT, Hertzog, DW, Jones, TD, Polly, C, Sedykh, S, Urner, D, Haeberlen, U, Endo, K, Hirabayashi, H, Kurokawa, S, Yamamoto, A, Green, MA, Cushman, P, Kindem, J, Duong, L, Giron, S, McNabb, R, Miller, D, Zimmerman, D, Mizumachi, Y, Iwasaki, M, Ahn, HE, Deng, H, Dhawan, SK, Disco, A, Farley, FJM, Fei, Erkang, Grosse-Perdekamp, M, Hughes, VW, Kawall, D, Redin, SI, Steinmetz, A, and Precision Frontier

Subjects
G-2, Physics::Accelerator Physics, NMR
Abstract

The muon anomalous magnetic moment has been measured in a new experiment at Brookhaven. Polarized muons were stored in a superferric ring, and the angular frequency difference, omega(a), between the spin precession and orbital frequencies was determined by measuring the time distribution of high-energy decay positrons. The ratio R of omega(a) to the Larmor precession frequency of free protons, omega(p), in the storage-ring magnetic field was measured. We find R = 3.707 220(48) X 10(-3). With mu(mu)/mu(p) = 3.183 345 47(47) this gives a(mu+) = 1 165 925(15) X 10(-9) (+/-13 ppm), in good agreement with the previous CERN measurements for mu(+) and mu(-) and of approximately the same precision.

Published
1999

2. Study of the process e(+)e(-)->eta gamma -> 7 gamma in the energy region root s < 1.4 GeV

Author

Achasov, Mn, Baru, Se, Beloborodov, Ki, Berdyugin, Av, Bogdanchikov, Ag, Bozhenok, Av, Bukin, Ad, Bukin, Da, Burdin, Sv, Tatyana Dimova, Drozdetski, Aa, Druzhinin, Vp, Golubev, Vb, Ivanchenko, Vn, Ivanov, Pm, Koop, Ia, Korol, Aa, Korostelev, Ms, Koshuba, Sv, Otboev, Av, Pakhtusova, Ev, Perevedentsev, Ea, Salnikov, Aa, Serednyakov, Si, Shary, Vv, Shatunov, Ym, Sidorov, Va, Silagadze, Zk, Skripkin, Ag, and Vasiljev, Av

3. Experiments with the SND detector at the e(+)e(-) collider VEPP-2M in Novosibirsk

Author

Achasov, Mn, Beloborodov, Ki, Berdyugin, Av, Bozhenok, Av, Bukin, Ad, Bukin, Da, Burdin, Sv, Danilov, Vv, Tatyana Dimova, Dolinsky, Si, Druzhinin, Vp, Dubrovin, Ms, Gaponenko, Ia, Golubev, Vb, Ivanchenko, Vn, Ivanov, Pi, Koop, Ia, Korol, Aa, Korostelev, Ms, Koshuba, Sv, Lysenko, Ap, Mamutkin, Aa, Nesterenko, In, Pakhtusova, Ev, Perevedentsev, Ea, Polunin, Aa, Pozdeev, Eg, Ptitsyn, Vi, Pyata, Ee, Salnikov, Aa, Savchkov, Av, Serednyakov, Si, Shary, Vv, Shatunov, Ym, Sidorov, Va, Silagadze, Zk, Skrinsky, An, Usov, Yv, Valishev, Aa, Varganov, Av, Vasiljev, Av, and Velikzhanin, Ys

4. New experimental data for the decays phi -> mu(+)mu(-) and phi -> pi(+)pi(-) from SND detector

Author

Achasov, Mn, Aulchenko, Vm, Beloborodov, Ki, Berdyugin, Av, Bozhenok, Av, Bukin, Da, Burdin, Sv, Tatyana Dimova, Dolinsky, Si, Drozdetsky, Aa, Druzhinin, Vp, Dubrovin, Ms, Gaponenko, Ia, Golubev, Vb, Ivanchenko, Vn, Ivanov, Pm, Korol, Aa, Koshuba, Sv, Kukartsev, Ga, Nesterenko, In, Otboev, Av, Pakhtusova, Ev, Popov, Vm, Salnikov, Aa, Serednyakov, Si, Shary, Vv, Shatunov, Ym, Sidorov, Va, Silagadze, Zk, Usov, Yv, Vasiljev, Av, and Zakharov, As

5. Evidence of phi ->pi(0)pi(0)gamma and phi ->pi(0)eta gamma decays in SND experiment at VEPP-2M

Author

Achasov, Mn, Berdyugin, Av, Bozhenok, Av, Bukin, Ad, Bukin, Da, Burdin, Sv, Dimova, Tv, Druzhinin, Vp, Dubrovin, Ms, Gaponenko, Ia, Golubev, Vb, Ivanchenko, Vn, Koop, Ia, Korol, Aa, Koshuba, Sv, Pakhtusova, Ev, Salnikov, Aa, Serednyakov, Si, Viatcheslav Sharyy, Shatunov, Ym, Sidorov, Va, Silagadze, Zk, Skrinsky, An, and Usov, Yv

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment, Nuclear Experiment, High Energy Physics - Experiment
Abstract

Preliminary results on the study of e+e- --> phi(1020) --> pi0 pi0 gamma, eta pi0 gamma processes from SND experiment at VEPP-2M collider in Novosibirsk are presented. Branching ratios of rare radiative phi --> pi0 pi0 gamma and phi --> pi0 eta gamma decays are measured: B(phi --> pi0 pi0 gamma ) = (1.1 +- 0.2) * 10^-4 (invariant mass (pi0 pi0) < 800 MeV), B(phi --> eta pi0 gamma ) = (1.3 +- 0.5) * 10^-4., Comment: Talk at the HADRON97 conference, BNL, Aug 24-30 1997; LaTeX, 4 pages, 4 eps figures

6. Measurement of the e(+)e(-)->pi(+)pi(-) cross-section with the CMD-2 detector

Author

Akhmetshin, Rr, Aksenov, Ga, Astakhov, Va, Anashkin, Ev, Arpagaus, M., Aulchenko, Vm, Banzarov, Vs, Barkov, Lm, Baru, Se, Bashtovoy, Ns, Bondar, Ae, Chernyak, Dv, Chertovskikh, Ag, Danilov, Vv, Dvoretsky, As, Eidelman, Si, Fedotovich, Gv, Gabyshev, Ni, Grebeniuk, Aa, Grigoriev, Dn, Ivanov, Pm, Vassili Kazanin, Khazin, Bi, Klimenkov, Av, Koop, Ia, Kurdadze, Lm, Kuzmin, As, Lechner, M., Lukin, Pa, Logashenko, Ib, Lysenko, Ap, Maksimov, Av, Merzlyakov, Yi, Nesterenko, In, Okhapkin, Vs, Perevedentsev, Ea, Popkov, Ev, Polunin, Aa, Pozdeev, Eg, Ptitzyn, Vi, Purlatz, Ta, Root, Ni, Ruban, Aa, Ryskulov, Nm, Shamov, Ag, Shatunov, Ym, Shekhtman, Ai, Shubin, Ma, Shwartz, Ba, Sidorov, Va, Skrinsky, An, Smakhtin, Vp, Snopkov, Ig, Solodov, Ep, Stepanov, Py, Sukhanov, Ai, Yudin, Yy, Zverev, Sg, Brown, Dh, Roberts, Bl, Thompson, Ja, and Hughes, Vw

7. Measurement of the Pion Form Factor with CMD-3 Detector and Its Implication to the Hadronic Contribution to Muon (g-2).

Author

Ignatov FV, Akhmetshin RR, Amirkhanov AN, Anisenkov AV, Aulchenko VM, Bashtovoy NS, Berkaev DE, Bondar AE, Bragin AV, Eidelman SI, Epifanov DA, Epshteyn LB, Erofeev AL, Fedotovich GV, Gorkovenko AO, Grancagnolo FJ, Grebenuk AA, Gribanov SS, Grigoriev DN, Ivanov VL, Karpov SV, Kasaev AS, Kazanin VF, Khazin BI, Kirpotin AN, Koop IA, Korobov AA, Kozyrev AN, Kozyrev EA, Krokovny PP, Kuzmenko AE, Kuzmin AS, Logashenko IB, Lukin PA, Lysenko AP, Mikhailov KY, Obraztsov IV, Okhapkin VS, Otboev AV, Perevedentsev EA, Pestov YN, Popov AS, Razuvaev GP, Rogovsky YA, Ruban AA, Ryskulov NM, Ryzhenenkov AE, Semenov AV, Senchenko AI, Shatunov PY, Shatunov YM, Shebalin VE, Shemyakin DN, Shwartz BA, Shwartz DB, Sibidanov AL, Solodov EP, Talyshev AA, Timoshenko MV, Titov VM, Tolmachev SS, Vorobiov AI, Yudin YV, Zemlyansky IM, Zhadan DS, Zharinov YM, and Zubakin AS

Abstract

The cross section of the process e^{+}e^{-}→π^{+}π^{-} has been measured in the center-of-mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on an integrated luminosity of about 88  pb^{-1}, of which 62  pb^{-1} represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the ρ resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed.

Published
2024
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8. Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm.

Author

Abi B, Albahri T, Al-Kilani S, Allspach D, Alonzi LP, Anastasi A, Anisenkov A, Azfar F, Badgley K, Baeßler S, Bailey I, Baranov VA, Barlas-Yucel E, Barrett T, Barzi E, Basti A, Bedeschi F, Behnke A, Berz M, Bhattacharya M, Binney HP, Bjorkquist R, Bloom P, Bono J, Bottalico E, Bowcock T, Boyden D, Cantatore G, Carey RM, Carroll J, Casey BCK, Cauz D, Ceravolo S, Chakraborty R, Chang SP, Chapelain A, Chappa S, Charity S, Chislett R, Choi J, Chu Z, Chupp TE, Convery ME, Conway A, Corradi G, Corrodi S, Cotrozzi L, Crnkovic JD, Dabagov S, De Lurgio PM, Debevec PT, Di Falco S, Di Meo P, Di Sciascio G, Di Stefano R, Drendel B, Driutti A, Duginov VN, Eads M, Eggert N, Epps A, Esquivel J, Farooq M, Fatemi R, Ferrari C, Fertl M, Fiedler A, Fienberg AT, Fioretti A, Flay D, Foster SB, Friedsam H, Frlež E, Froemming NS, Fry J, Fu C, Gabbanini C, Galati MD, Ganguly S, Garcia A, Gastler DE, George J, Gibbons LK, Gioiosa A, Giovanetti KL, Girotti P, Gohn W, Gorringe T, Grange J, Grant S, Gray F, Haciomeroglu S, Hahn D, Halewood-Leagas T, Hampai D, Han F, Hazen E, Hempstead J, Henry S, Herrod AT, Hertzog DW, Hesketh G, Hibbert A, Hodge Z, Holzbauer JL, Hong KW, Hong R, Iacovacci M, Incagli M, Johnstone C, Johnstone JA, Kammel P, Kargiantoulakis M, Karuza M, Kaspar J, Kawall D, Kelton L, Keshavarzi A, Kessler D, Khaw KS, Khechadoorian Z, Khomutov NV, Kiburg B, Kiburg M, Kim O, Kim SC, Kim YI, King B, Kinnaird N, Korostelev M, Kourbanis I, Kraegeloh E, Krylov VA, Kuchibhotla A, Kuchinskiy NA, Labe KR, LaBounty J, Lancaster M, Lee MJ, Lee S, Leo S, Li B, Li D, Li L, Logashenko I, Lorente Campos A, Lucà A, Lukicov G, Luo G, Lusiani A, Lyon AL, MacCoy B, Madrak R, Makino K, Marignetti F, Mastroianni S, Maxfield S, McEvoy M, Merritt W, Mikhailichenko AA, Miller JP, Miozzi S, Morgan JP, Morse WM, Mott J, Motuk E, Nath A, Newton D, Nguyen H, Oberling M, Osofsky R, Ostiguy JF, Park S, Pauletta G, Piacentino GM, Pilato RN, Pitts KT, Plaster B, Počanić D, Pohlman N, Polly CC, Popovic M, Price J, Quinn B, Raha N, Ramachandran S, Ramberg E, Rider NT, Ritchie JL, Roberts BL, Rubin DL, Santi L, Sathyan D, Schellman H, Schlesier C, Schreckenberger A, Semertzidis YK, Shatunov YM, Shemyakin D, Shenk M, Sim D, Smith MW, Smith A, Soha AK, Sorbara M, Stöckinger D, Stapleton J, Still D, Stoughton C, Stratakis D, Strohman C, Stuttard T, Swanson HE, Sweetmore G, Sweigart DA, Syphers MJ, Tarazona DA, Teubner T, Tewsley-Booth AE, Thomson K, Tishchenko V, Tran NH, Turner W, Valetov E, Vasilkova D, Venanzoni G, Volnykh VP, Walton T, Warren M, Weisskopf A, Welty-Rieger L, Whitley M, Winter P, Wolski A, Wormald M, Wu W, and Yoshikawa C

Abstract

We present the first results of the Fermilab National Accelerator Laboratory (FNAL) Muon g-2 Experiment for the positive muon magnetic anomaly a&#95;{μ}≡(g&#95;{μ}-2)/2. The anomaly is determined from the precision measurements of two angular frequencies. Intensity variation of high-energy positrons from muon decays directly encodes the difference frequency ω&#95;{a} between the spin-precession and cyclotron frequencies for polarized muons in a magnetic storage ring. The storage ring magnetic field is measured using nuclear magnetic resonance probes calibrated in terms of the equivalent proton spin precession frequency ω[over ˜]&#95;{p}^{'} in a spherical water sample at 34.7 °C. The ratio ω&#95;{a}/ω[over ˜]&#95;{p}^{'}, together with known fundamental constants, determines a&#95;{μ}(FNAL)=116 592 040(54)×10^{-11} (0.46 ppm). The result is 3.3 standard deviations greater than the standard model prediction and is in excellent agreement with the previous Brookhaven National Laboratory (BNL) E821 measurement. After combination with previous measurements of both μ^{+} and μ^{-}, the new experimental average of a&#95;{μ}(Exp)=116 592 061(41)×10^{-11} (0.35 ppm) increases the tension between experiment and theory to 4.2 standard deviations.

Published
2021
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9. Backscattering of laser radiation on ultrarelativistic electrons in a transverse magnetic field: evidence of MeV-scale photon interference.

Author

Abakumova EV, Achasov MN, Berkaev DE, Kaminsky VV, Muchnoi NY, Perevedentsev EA, Pyata EE, and Shatunov YM

Abstract

In this Letter we report an observation of interference effects in Compton scattering in the experiment held on the VEPP-2000 collider. Infrared laser radiation was scattered head-on the 990 MeV electrons inside the dipole magnet, where an electron orbit radius is about 140 cm. It was observed that the energy spectrum of backscattered photons, measured by a HPGe detector, differs from that defined by the Klein-Nishina cross section and scattering kinematics of free electrons. The explanation of the effect, proposed in terms of classical electrodynamics, is in agreement with QED calculations.

Published
2013
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10. Search for Lorentz and CPT violation effects in Muon spin precession.

Author

Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Deninger W, Dhawan SK, Druzhinin VP, Duong L, Efstathiadis E, Farley FJ, Fedotovich GV, Giron S, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Kawamura M, Khazin BI, Kindem J, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Mi J, Miller JP, Mizumachi Y, Morse WM, Nikas D, Onderwater CJ, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Sedykh S, Semertzidis YK, Shagin P, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Steinmetz A, Sulak LR, Timmermans C, Trofimov A, Urner D, von Walter P, Warburton D, Winn D, Yamamoto A, and Zimmerman D

Abstract

The spin precession frequency of muons stored in the (g-2) storage ring has been analyzed for evidence of Lorentz and CPT violation. Two Lorentz and CPT violation signatures were searched for a nonzero delta omega a(=omega a mu+ - omega a mu-) and a sidereal variation of omega a mu+/-). No significant effect is found, and the following limits on the standard-model extension parameters are obtained: bZ = -(1.0+/-1.1) x 10(-23) GeV; (m mu dZ0 + HXY)=(1.8+/-6.0) x 10(-23) GeV; and the 95% confidence level limits b perpendicular mu+ <1.4 x 10(-24) GeV and b perpendicular mu- <2.6 x 10(-24) GeV.

Published
2008
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11. Measurement of the negative muon anomalous magnetic moment to 0.7 ppm.

Author

Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Dhawan SK, Druzhinin VP, Duong L, Farley FJ, Fedotovich GV, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Khazin BI, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Miller JP, Morse WM, Nikas D, Onderwater CJ, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, Zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Semertzidis YK, Shagin P, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Sulak LR, Trofimov A, von Walter P, and Yamamoto A

Abstract

The anomalous magnetic moment of the negative muon has been measured to a precision of 0.7 ppm (ppm) at the Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and is over an order of magnitude more precise than the previous measurement for the negative muon. The result a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where the first uncertainty is statistical and the second is systematic, is consistent with previous measurements of the anomaly for the positive and the negative muon. The average of the measurements of the muon anomaly is a(mu)(exp)=11 659 208(6) x 10(-10) (0.5 ppm).

Published
2004
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12. Measurement of the positive muon anomalous magnetic moment to 0.7 ppm.

Author

Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Deninger W, Dhawan SK, Druzhinin VP, Duong L, Efstathiadis E, Farley FJ, Fedotovich GV, Giron S, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Khazin BI, Kindem J, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Mi J, Miller JP, Morse WM, Nikas D, Onderwater CJ, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, Zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Shagin P, Semertzidis YK, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Steinmetz A, Sulak LR, Trofimov A, Urner D, Von Walter P, Warburton D, and Yamamoto A

Abstract

A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron, based on data collected in the year 2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is in good agreement with previous measurements and has an error about one-half that of the combined previous data. The present world average experimental value is a(mu)(expt)=11 659 203(8)x10(-10) (0.7 ppm).

Published
2002
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13. Precise measurement of the positive muon anomalous magnetic moment.

Author

Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Deninger W, Dhawan SK, Druzhinin VP, Duong L, Efstathiadis E, Farley FJ, Fedotovich GV, Giron S, Gray F, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Kawamura M, Khazin BI, Kindem J, Krienen F, Kronkvist I, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Mi J, Miller JP, Morse WM, Nikas D, Onderwater CJ, Orlov Y, Ozben CS, Paley JM, Polly C, Pretz J, Prigl R, zu Putlitz G, Redin SI, Rind O, Roberts BL, Ryskulov N, Sedykh S, Semertzidis YK, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Steinmetz A, Sulak LR, Timmermans C, Trofimov A, Urner D, von Walter P, Warburton D, Winn D, Yamamoto A, and Zimmerman D

Abstract

A precise measurement of the anomalous g value, a(mu) = (g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a(mu+) = 11 659 202(14) (6) x 10(-10) (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a(mu)(SM) = 11 659 159.6(6.7) x 10(-10) (0.57 ppm) and a(mu)(exp) - a(mu)(SM) = 43(16) x 10(-10) in which a(mu)(exp) is the world average experimental value.

Published
2001
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14. Direct measurement of the phi(1020) leptonic branching ratio.

Author

Achasov MN, Beloborodov KI, Berdyugin AV, Bogdanchikov AG, Bozhenok AV, Bukin AD, Bukin DA, Burdin SV, Dimova TV, Drozdetsky AA, Druzhinin VP, Dubrovin MS, Gaponenko IA, Golubev VB, Ivanchenko VN, Ivanov PM, Korol AA, Koshuba SV, Lysenko AP, Nesterenko IN, Pakhtusova EV, Perevedentsev EA, Salnikov AA, Serednyakov SI, Shary VV, Shatunov YM, Sidorov VA, Silagadze ZK, Skrinsky AN, Usov YV, and Vasiljev AV

Abstract

The process e(+)e(-)-->mu(+)mu(-) has been studied by the SND detector at the VEPP-2M e(+)e(-) collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio B(phi-->l(+)l(-)) identical with square root of B(phi-->e(+)e(-))B(phi-->mu(+)mu(-))] = (2.89 +/- 0.10 +/- 0.06) x 10(-4) agrees well with the Particle Data Group value B(phi-->e(+)e(-)) = (2.91 +/- 0.07) x 10(-4), confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi-->mu(+)mu(-)) = (2.87 +/- 0.20 +/- 0.14) x 10(-4) was obtained.

Published
2001
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