11 research outputs found
Measurement of CP Asymmetries and Branching Fractions in Charmless Two-Body B-Meson Decays to Pions and Kaons
We present improved measurements of CP-violation parameters in the decays
, , and , and of
the branching fractions for and . The
results are obtained with the full data set collected at the
resonance by the BABAR experiment at the PEP-II asymmetric-energy factory
at the SLAC National Accelerator Laboratory, corresponding to
million pairs. We find the CP-violation parameter values and
branching fractions where in each case, the first uncertainties are statistical
and the second are systematic. We observe CP violation with a significance of
6.7 standard deviations for and 6.1 standard deviations for
, including systematic uncertainties. Constraints on the
Unitarity Triangle angle are determined from the isospin relations
among the rates and asymmetries. Considering only the solution
preferred by the Standard Model, we find to be in the range
at the 68% confidence level.Comment: 18 pages, 11 postscript figures, submitted to Phys. Rev.
Search for di-muon decays of a low-mass Higgs boson in radiative decays of the ΄(1S)
We search for di-muon decays of a low-mass Higgs boson (A[superscript 0]) produced in radiative ΄(1S) decays. The ΄(1S) sample is selected by tagging the pion pair in the ΄(2S,3S)âÏ[superscript +]Ï[superscript -]΄(1S) transitions, using a data sample of 92.8Ă10[superscript 6] ΄(2S) and 116.8Ă10[superscript 6] ΄(3S) events collected by the BABAR detector. We find no evidence for A[superscript 0] production and set 90% confidence level upper limits on the product branching fraction B(΄(1S)âÎłA[superscript 0])ĂB(A[superscript 0]âÎŒ[superscript +]ÎŒ[superscript -]) in the range of (0.28-9.7)Ă10[superscript -6] for 0.212â€m[subscript A][superscript 0]â€9.20ââGeV/c[superscript 2]. The results are combined with our previous measurements of ΄(2S,3S)âÎłA[superscript 0], A[superscript 0]âÎŒ[superscript +]ÎŒ[superscript -] to set limits on the effective coupling of the b quark to the A[superscript 0].United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio
Study of the baryonic B decay B[superscript -]âÎŁ[subscript c][superscript ++]pÌ Ï[superscript -]Ï[superscript -]
We report the measurement of the baryonic B decay B[superscript -]âÎŁ[subscript c][superscript ++]pÌ
Ï[superscript -]Ï[superscript -]. Using a data sample of 467Ă10[superscript 6] BBÌ
pairs collected with the BABAR detector at the PEP-II storage ring at SLAC, the measured branching fraction is (2.98±0.16[subscript (stat)]±0.15[subscript (syst)]±0.77[subscript (Îc)])Ă10[superscript -4], where the last error is due to the uncertainty in B(Î[subscript c]+âpK[superscript -]Ï[superscript +]). The data suggest the existence of resonant subchannels B[superscript -]âÎ[subscript c](2595)[superscript +]pÌ
Ï[superscript -] and, possibly, B[superscript -]âÎŁ[subscript c][superscript ++]ÎÌ
[superscript --]Ï[superscript -]. We see unexplained structures in m(ÎŁ[subscript c][superscript ++]Ï[superscript -]Ï[superscript -]) at 3.25ââGeV/c[superscript 2], 3.8ââGeV/c[superscript 2], and 4.2ââGeV/c[superscript 2]
Precision Measurement of the BâX[subscript s]Îł Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A[subscript CP](BâX[subscript s+d]Îł)
The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, BâX[subscript s]Îł plus BâX[subscript d]Îł, is studied using a data sample of (382.8±4.2)Ă10[superscript 6]΄(4S)âBBÌ
decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(BâX[subscript s]Îł)=(3.21±0.33)Ă10[superscript -4] for E[subscript Îł]>1.8ââGeV and the direct CP asymmetry A[subscript CP](BâX[subscript s+d]Îł)=0.057±0.063. The effects of detector resolution and Doppler smearing are unfolded to measure the photon energy spectrum in the B meson rest frame.United States. Dept. of Energy.National Science Foundation (U.S.
Erratum: Branching fraction measurements of the color-suppressed decays B[over \uaf]^{0} to D^{(*)0}\u3c0^{0}, D^{(*)0}\u3b7, D^{(*)0}\u3c9, and D^{(*)0}\u3b7^{\u2032} and measurement of the polarization in the decay B[over \uaf]^{0}\u2192D^{*0}\u3c9 [Phys. Rev. D 84, 112007 (2011)]
none387We report updated branching fraction measurements of the color-suppressed decays BÌ
0âD0Ï0, D*0Ï0, D0η, D*0η, D0Ï, D*0Ï, D0ηâČ, and D*0ηâČ. We measure the branching fractions (Ă10-4): B(BÌ
0âD0Ï0)=2.69±0.09±0.13, B(BÌ
0âD*0Ï0)=3.05±0.14±0.28, B(BÌ
0âD0η)=2.53±0.09±0.11, B(BÌ
0âD*0η)=2.69±0.14±0.23, B(BÌ
0âD0Ï)=2.57±0.11±0.14, B(BÌ
0âD*0Ï)=4.55±0.24±0.39, B(BÌ
0âD0ηâČ)=1.48±0.13±0.07, and B(BÌ
0âD*0ηâČ)=1.49±0.22±0.15. We also present the first measurement of the longitudinal polarization fraction of the decay channel D*0Ï, fL=(66.5±4.7±1.5)%. In the above, the first uncertainty is statistical and the second is systematic. The results are based on a sample of (454±5)Ă106 BBÌ
pairs collected at the ΄(4S) resonance, with the BABAR detector at the PEP-II storage rings at SLAC. The measurements are the most precise determinations of these quantities from a single experiment. They are compared to theoretical predictions obtained by factorization, Soft Collinear Effective Theory (SCET) and perturbative QCD (pQCD). We find that the presence of final state interactions is favored and the measurements are in better agreement with SCET than with pQCD.noneJ. P. Lees;V. Poireau;V. Tisserand;J. Garra Tico;E. Grauges;M. Martinelli;D. A. Milanes;A. Palano;M. Pappagallo;G. Eigen;B. Stugu;D. N. Brown;L. T. Kerth;Yu. G. Kolomensky;G. Lynch;H. Koch;T. Schroeder;D. J. Asgeirsson;C. Hearty;T. S. Mattison;J. A. McKenna;A. Khan;V. E. Blinov;A. R. Buzykaev;V. P. Druzhinin;V. B. Golubev;E. A. Kravchenko;A. P. Onuchin;S. I. Serednyakov;Yu. I. Skovpen;E. P. Solodov;K. Yu. Todyshev;A. N. Yushkov;M. Bondioli;D. Kirkby;A. J. Lankford;M. Mandelkern;D. P. Stoker;H. Atmacan;J. W. Gary;F. Liu;O. Long;G. M. Vitug;C. Campagnari;T. M. Hong;D. Kovalskyi;J. D. Richman;C. A. West;A. M. Eisner;J. Kroseberg;W. S. Lockman;A. J. Martinez;T. Schalk;B. A. Schumm;A. Seiden;C. H. Cheng;D. A. Doll;B. Echenard;K. T. Flood;D. G. Hitlin;P. Ongmongkolkul;F. C. Porter;A. Y. Rakitin;R. Andreassen;M. S. Dubrovin;Z. Huard;B. T. Meadows;M. D. Sokoloff;L. Sun;P. C. Bloom;W. T. Ford;A. Gaz;M. Nagel;U. Nauenberg;J. G. Smith;S. R. Wagner;R. Ayad;W. H. Toki;B. Spaan;M. J. Kobel;X. Prudent;K. R. Schubert;R. Schwierz;D. Bernard;M. Verderi;P. J. Clark;S. Playfer;D. Bettoni;C. Bozzi;R. Calabrese;G. Cibinetto;E. Fioravanti;I. Garzia;E. Luppi;M. Munerato;M. Negrini;L. Piemontese;V. Santoro;R. Baldini-Ferroli;A. Calcaterra;R. de Sangro;G. Finocchiaro;M. Nicolaci;P. Patteri;I. M. Peruzzi;M. Piccolo;M. Rama;A. Zallo;R. Contri;E. Guido;M. Lo Vetere;M. R. Monge;S. Passaggio;C. Patrignani;E. Robutti;B. Bhuyan;V. Prasad;C. L. Lee;M. Morii;A. J. Edwards;A. Adametz;J. Marks;U. Uwer;F. U. Bernlochner;M. Ebert;H. M. Lacker;T. Lueck;P. D. Dauncey;M. Tibbetts;P. K. Behera;U. Mallik;C. Chen;J. Cochran;W. T. Meyer;S. Prell;E. I. Rosenberg;A. E. Rubin;A. V. Gritsan;Z. J. Guo;N. Arnaud;M. Davier;G. Grosdidier;F. Le Diberder;A. M. Lutz;B. Malaescu;P. Roudeau;M. H. Schune;A. Stocchi;G. Wormser;D. J. Lange;D. M. Wright;I. Bingham;C. A. Chavez;J. P. Coleman;J. R. Fry;E. Gabathuler;D. E. Hutchcroft;D. J. Payne;C. Touramanis;A. J. Bevan;F. Di Lodovico;R. Sacco;M. Sigamani;G. Cowan;D. N. Brown;C. L. Davis;A. G. Denig;M. Fritsch;W. Gradl;A. Hafner;E. Prencipe;K. E. Alwyn;D. Bailey;R. J. Barlow;G. Jackson;G. D. Lafferty;R. Cenci;B. Hamilton;A. Jawahery;D. A. Roberts;G. Simi;C. Dallapiccola;R. Cowan;D. Dujmic;G. Sciolla;D. Lindemann;P. M. Patel;S. H. Robertson;M. Schram;P. Biassoni;A. Lazzaro;V. Lombardo;N. Neri;F. Palombo;S. Stracka;L. Cremaldi;R. Godang;R. Kroeger;P. Sonnek;D. J. Summers;X. Nguyen;P. Taras;G. De Nardo;D. Monorchio;G. Onorato;C. Sciacca;G. Raven;H. L. Snoek;C. P. Jessop;K. J. Knoepfel;J. M. LoSecco;W. F. Wang;K. Honscheid;R. Kass;J. Brau;R. Frey;N. B. Sinev;D. Strom;E. Torrence;E. Feltresi;N. Gagliardi;M. Margoni;M. Morandin;M. Posocco;M. Rotondo;F. Simonetto;R. Stroili;E. Ben-Haim;M. Bomben;G. R. Bonneaud;H. Briand;G. Calderini;J. Chauveau;O. Hamon;Ph. Leruste;G. Marchiori;J. Ocariz;S. Sitt;M. Biasini;E. Manoni;S. Pacetti;A. Rossi;C. Angelini;G. Batignani;S. Bettarini;M. Carpinelli;G. Casarosa;A. Cervelli;F. Forti;M. A. Giorgi;A. Lusiani;B. Oberhof;E. Paoloni;A. Perez;G. Rizzo;J. J. Walsh;D. Lopes Pegna;C. Lu;J. Olsen;A. J. S. Smith;A. V. Telnov;F. Anulli;G. Cavoto;R. Faccini;F. Ferrarotto;F. Ferroni;M. Gaspero;L. Li Gioi;M. A. Mazzoni;G. Piredda;C. BĂŒnger;O. GrĂŒnberg;T. Hartmann;T. Leddig;H. Schröder;R. Waldi;T. Adye;E. O. Olaiya;F. F. Wilson;S. Emery;G. Hamel de Monchenault;G. Vasseur;Ch. YĂšche;D. Aston;D. J. Bard;R. Bartoldus;C. Cartaro;M. R. Convery;J. Dorfan;G. P. Dubois-Felsmann;W. Dunwoodie;R. C. Field;M. Franco Sevilla;B. G. Fulsom;A. M. Gabareen;M. T. Graham;P. Grenier;C. Hast;W. R. Innes;M. H. Kelsey;H. Kim;P. Kim;M. L. Kocian;D. W. G. S. Leith;P. Lewis;S. Li;B. Lindquist;S. Luitz;V. Luth;H. L. Lynch;D. B. MacFarlane;D. R. Muller;H. Neal;S. Nelson;I. Ofte;M. Perl;T. Pulliam;B. N. Ratcliff;A. Roodman;A. A. Salnikov;R. H. Schindler;A. Snyder;D. Su;M. K. Sullivan;J. Vaâvra;A. P. Wagner;M. Weaver;W. J. Wisniewski;M. Wittgen;D. H. Wright;H. W. Wulsin;A. K. Yarritu;C. C. Young;V. Ziegler;W. Park;M. V. Purohit;R. M. White;J. R. Wilson;A. Randle-Conde;S. J. Sekula;M. Bellis;J. F. Benitez;P. R. Burchat;T. S. Miyashita;M. S. Alam;J. A. Ernst;R. Gorodeisky;N. Guttman;D. R. Peimer;A. Soffer;P. Lund;S. M. Spanier;R. Eckmann;J. L. Ritchie;A. M. Ruland;C. J. Schilling;R. F. Schwitters;B. C. Wray;J. M. Izen;X. C. Lou;F. Bianchi;D. Gamba;L. Lanceri;L. Vitale;F. Martinez-Vidal;A. Oyanguren;H. Ahmed;J. Albert;Sw. Banerjee;H. H. F. Choi;G. J. King;R. Kowalewski;M. J. Lewczuk;C. Lindsay;I. M. Nugent;J. M. Roney;R. J. Sobie;N. Tasneem;T. J. Gershon;P. F. Harrison;T. E. Latham;E. M. T. Puccio;H. R. Band;S. Dasu;Y. Pan;R. Prepost;S. L. WuJ. P., Lees; V., Poireau; V., Tisserand; J., Garra Tico; E., Grauges; M., Martinelli; D. A., Milanes; A., Palano; M., Pappagallo; G., Eigen; B., Stugu; D. N., Brown; L. T., Kerth; Kolomensky, Y. u. G.; G., Lynch; H., Koch; T., Schroeder; D. J., Asgeirsson; C., Hearty; T. S., Mattison; J. A., Mckenna; A., Khan; V. E., Blinov; A. R., Buzykaev; V. P., Druzhinin; V. B., Golubev; E. A., Kravchenko; A. P., Onuchin; S. I., Serednyakov; Skovpen, Y. u. I.; E. P., Solodov; Todyshev, K. Y. u.; A. N., Yushkov; M., Bondioli; D., Kirkby; A. J., Lankford; M., Mandelkern; D. P., Stoker; H., Atmacan; J. W., Gary; F., Liu; O., Long; G. M., Vitug; C., Campagnari; T. M., Hong; D., Kovalskyi; J. D., Richman; C. A., West; A. M., Eisner; J., Kroseberg; W. S., Lockman; A. J., Martinez; T., Schalk; B. A., Schumm; A., Seiden; C. H., Cheng; D. A., Doll; B., Echenard; K. T., Flood; D. G., Hitlin; P., Ongmongkolkul; F. C., Porter; A. Y., Rakitin; R., Andreassen; M. S., Dubrovin; Z., Huard; B. T., Meadows; M. D., Sokoloff; L., Sun; P. C., Bloom; W. T., Ford; A., Gaz; M., Nagel; U., Nauenberg; J. G., Smith; S. R., Wagner; R., Ayad; W. H., Toki; B., Spaan; M. J., Kobel; X., Prudent; K. R., Schubert; R., Schwierz; D., Bernard; M., Verderi; P. J., Clark; S., Playfer; Bettoni, Diego; Bozzi, Concezio; Calabrese, Roberto; Cibinetto, Gianluigi; Fioravanti, Elisa; Garzia, Isabella; Luppi, Eleonora; M., Munerato; M., Negrini; L., Piemontese; Santoro, Valentina; R., Baldini Ferroli; A., Calcaterra; R., de Sangro; G., Finocchiaro; M., Nicolaci; P., Patteri; I. M., Peruzzi; M., Piccolo; M., Rama; A., Zallo; R., Contri; E., Guido; M., Lo Vetere; M. R., Monge; S., Passaggio; C., Patrignani; E., Robutti; B., Bhuyan; V., Prasad; C. L., Lee; M., Morii; A. J., Edwards; A., Adametz; J., Marks; U., Uwer; F. U., Bernlochner; M., Ebert; H. M., Lacker; T., Lueck; P. D., Dauncey; M., Tibbetts; P. K., Behera; U., Mallik; C., Chen; J., Cochran; W. T., Meyer; S., Prell; E. I., Rosenberg; A. E., Rubin; A. V., Gritsan; Z. J., Guo; N., Arnaud; M., Davier; G., Grosdidier; F., Le Diberder; A. M., Lutz; B., Malaescu; P., Roudeau; M. H., Schune; A., Stocchi; G., Wormser; D. J., Lange; D. M., Wright; I., Bingham; C. A., Chavez; J. P., Coleman; J. R., Fry; E., Gabathuler; D. E., Hutchcroft; D. J., Payne; C., Touramanis; A. J., Bevan; F., Di Lodovico; R., Sacco; M., Sigamani; G., Cowan; D. N., Brown; C. L., Davis; A. G., Denig; M., Fritsch; W., Gradl; A., Hafner; E., Prencipe; K. E., Alwyn; D., Bailey; R. J., Barlow; G., Jackson; G. D., Lafferty; R., Cenci; B., Hamilton; A., Jawahery; D. A., Roberts; G., Simi; C., Dallapiccola; R., Cowan; D., Dujmic; G., Sciolla; D., Lindemann; P. M., Patel; S. H., Robertson; M., Schram; P., Biassoni; A., Lazzaro; V., Lombardo; N., Neri; F., Palombo; S., Stracka; L., Cremaldi; R., Godang; R., Kroeger; P., Sonnek; D. J., Summers; X., Nguyen; P., Taras; G., De Nardo; D., Monorchio; G., Onorato; C., Sciacca; G., Raven; H. L., Snoek; C. P., Jessop; K. J., Knoepfel; J. M., Losecco; W. F., Wang; K., Honscheid; R., Kass; J., Brau; R., Frey; N. B., Sinev; D., Strom; E., Torrence; E., Feltresi; N., Gagliardi; M., Margoni; M., Morandin; M., Posocco; M., Rotondo; F., Simonetto; R., Stroili; E., Ben Haim; M., Bomben; G. R., Bonneaud; H., Briand; G., Calderini; J., Chauveau; O., Hamon; Leruste, P. h.; G., Marchiori; J., Ocariz; S., Sitt; M., Biasini; E., Manoni; S., Pacetti; A., Rossi; C., Angelini; G., Batignani; S., Bettarini; M., Carpinelli; G., Casarosa; A., Cervelli; F., Forti; M. A., Giorgi; A., Lusiani; B., Oberhof; E., Paoloni; A., Perez; G., Rizzo; J. J., Walsh; D., Lopes Pegna; C., Lu; J., Olsen; A. J. S., Smith; A. V., Telnov; F., Anulli; G., Cavoto; R., Faccini; F., Ferrarotto; F., Ferroni; M., Gaspero; L., Li Gioi; M. A., Mazzoni; G., Piredda; C., BĂŒnger; O., GrĂŒnberg; T., Hartmann; T., Leddig; H., Schröder; R., Waldi; T., Adye; E. O., Olaiya; F. F., Wilson; S., Emery; G., Hamel de Monchenault; G., Vasseur; YĂšche, C. h.; D., Aston; D. J., Bard; R., Bartoldus; C., Cartaro; M. R., Convery; J., Dorfan; G. P., Dubois Felsmann; W., Dunwoodie; R. C., Field; M., Franco Sevilla; B. G., Fulsom; A. M., Gabareen; M. T., Graham; P., Grenier; C., Hast; W. R., Innes; M. H., Kelsey; H., Kim; P., Kim; M. L., Kocian; D. W. G. S., Leith; P., Lewis; S., Li; B., Lindquist; S., Luitz; V., Luth; H. L., Lynch; D. B., Macfarlane; D. R., Muller; H., Neal; S., Nelson; I., Ofte; M., Perl; T., Pulliam; B. N., Ratcliff; A., Roodman; A. A., Salnikov; R. H., Schindler; A., Snyder; D., Su; M. K., Sullivan; J., VaâVra; A. P., Wagner; M., Weaver; W. J., Wisniewski; M., Wittgen; D. H., Wright; H. W., Wulsin; A. K., Yarritu; C. C., Young; V., Ziegler; W., Park; M. V., Purohit; R. M., White; J. R., Wilson; A., Randle Conde; S. J., Sekula; M., Bellis; J. F., Benitez; P. R., Burchat; T. S., Miyashita; M. S., Alam; J. A., Ernst; R., Gorodeisky; N., Guttman; D. R., Peimer; A., Soffer; P., Lund; S. M., Spanier; R., Eckmann; J. L., Ritchie; A. M., Ruland; C. J., Schilling; R. F., Schwitters; B. C., Wray; J. M., Izen; X. C., Lou; F., Bianchi; D., Gamba; L., Lanceri; L., Vitale; F., Martinez Vidal; A., Oyanguren; H., Ahmed; J., Albert; Banerjee, S. w.; H. H. F., Choi; G. J., King; R., Kowalewski; M. J., Lewczuk; C., Lindsay; I. M., Nugent; J. M., Roney; R. J., Sobie; N., Tasneem; T. J., Gershon; P. F., Harrison; T. E., Latham; E. M. T., Puccio; H. R., Band; S., Dasu; Y., Pan; R., Prepost; S. L., W
Observation of Meson Decay to
7 pages, 2 postscript figures. Submitted to Phys. Rev. Lett - P. Grenier aussi au LPCWe present a measurement of the branching fraction of the decay B0 --> a1(1260)^{+-} pi^{-+} with a1(1260)^{+-} --> pi^{-+} pi^{+-} pi^{+-}. The data sample consists of 218 million B B-bar pairs collected at the Y(4S) resonance and recorded by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC. The analysis is based on unbinned multivariate maximum likelihood fit. The measured branching fraction is: (16.6 +/- 1.9 +/- 1.5) 10^{-6}. The decay mode, observed for the first time, is seen with a significance of 9.2 sigma (systematic uncertainties included)
Observation of B0 Meson Decay to a1±(1260)Ïâ
We present a measurement of the branching fraction of the decay B0âa1±(1260)Ïâ with a1±(1260)âÏâϱϱ. The data sample corresponds to 218Ă106 BBÌ
pairs produced in e+e- annihilation through the ΄(4S) resonance. We measure the branching fraction B(B0âa1±(1260)Ïâ)B(a1±(1260)âÏâϱϱ)=(16.6±1.9±1.5)Ă10-6, where the first error quoted is statistical and the second is systematic
Measurements of Branching Fractions and Dalitz Distributions for B0\u2192D(*)\ub1K0\u3c0 13 Decays
We present measurements of the branching fractions for the three-body decays B0\u2192D(*) 13K0\u3c0\ub1 and their resonant submodes B0\u2192D(*) 13K*\ub1 using a sample of approximately 88
7106 BB\u305 pairs collected by the BABAR detector at the SLAC PEP-II asymmetric energy storage ring. We measure: B(B0\u2192D 13K0\u3c0\ub1)=(4.9\ub10.7stat\ub10.5syst)
710-4, B(B0\u2192D* 13K0\u3c0\ub1)=(3.0\ub10.7stat\ub10.3syst)
710-4, B(B0\u2192D 13K*\ub1)=(4.6\ub10.6stat\ub10.5syst)
710-4, B(B0\u2192D* 13K*\ub1)=(3.2\ub10.6stat\ub10.3syst)
710-4. From these measurements we determine the fractions of resonant events to be f(B0\u2192D 13K*\ub1)=0.63\ub10.08stat\ub10.04syst and f(B0\u2192D* 13K*\ub1)=0.72\ub10.14stat\ub10.05syst