12 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.
Study of the baryonic B decay B[superscript -]→Σ[subscript c][superscript ++]p̅ π[superscript -]π[superscript -]
We report the measurement of the baryonic B decay B[superscript -]→Σ[subscript c][superscript ++]p̅ π[superscript -]π[superscript -]. Using a data sample of 467×10[superscript 6] BB̅ 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 (Λc)])×10[superscript -4], where the last error is due to the uncertainty in B(Λ[subscript c]+→pK[superscript -]π[superscript +]). The data suggest the existence of resonant subchannels B[superscript -]→Λ[subscript c](2595)[superscript +]p̅ π[superscript -] and, possibly, B[superscript -]→Σ[subscript c][superscript ++]Δ̅[superscript --]π[superscript -]. We see unexplained structures in m(Σ[subscript c][superscript ++]π[superscript -]π[superscript -]) at 3.25 GeV/c[superscript 2], 3.8 GeV/c[superscript 2], and 4.2 GeV/c[superscript 2]
Search for di-muon decays of a low-mass Higgs boson in radiative decays of the Υ(1S)
We search for di-muon decays of a low-mass Higgs boson (A[superscript 0]) produced in radiative Υ(1S) decays. The Υ(1S) sample is selected by tagging the pion pair in the Υ(2S,3S)→π[superscript +]π[superscript -]Υ(1S) transitions, using a data sample of 92.8×10[superscript 6] Υ(2S) and 116.8×10[superscript 6] Υ(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(Υ(1S)→γA[superscript 0])×B(A[superscript 0]→μ[superscript +]μ[superscript -]) in the range of (0.28-9.7)×10[superscript -6] for 0.212≤m[subscript A][superscript 0]≤9.20 GeV/c[superscript 2]. The results are combined with our previous measurements of Υ(2S,3S)→γA[superscript 0], A[superscript 0]→μ[superscript +]μ[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
Precision Measurement of the B→X[subscript s]γ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A[subscript CP](B→X[subscript s+d]γ)
The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→X[subscript s]γ plus B→X[subscript d]γ, is studied using a data sample of (382.8±4.2)×10[superscript 6]Υ(4S)→BB̅ decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(B→X[subscript s]γ)=(3.21±0.33)×10[superscript -4] for E[subscript γ]>1.8 GeV and the direct CP asymmetry A[subscript CP](B→X[subscript s+d]γ)=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.
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)π∓
We present a measurement of the branching fraction of the decay B0→a1±(1260)π∓ with a1±(1260)→π∓π±π±. The data sample corresponds to 218×106 BB̅ pairs produced in e+e- annihilation through the Υ(4S) resonance. We measure the branching fraction B(B0→a1±(1260)π∓)B(a1±(1260)→π∓π±π±)=(16.6±1.9±1.5)×10-6, where the first error quoted is statistical and the second is systematic
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 B̅ 0→D0π0, D*0π0, D0η, D*0η, D0ω, D*0ω, D0η′, and D*0η′. We measure the branching fractions (×10-4): B(B̅ 0→D0π0)=2.69±0.09±0.13, B(B̅ 0→D*0π0)=3.05±0.14±0.28, B(B̅ 0→D0η)=2.53±0.09±0.11, B(B̅ 0→D*0η)=2.69±0.14±0.23, B(B̅ 0→D0ω)=2.57±0.11±0.14, B(B̅ 0→D*0ω)=4.55±0.24±0.39, B(B̅ 0→D0η′)=1.48±0.13±0.07, and B(B̅ 0→D*0η′)=1.49±0.22±0.15. We also present the first measurement of the longitudinal polarization fraction of the decay channel D*0ω, 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)×106 BB̅ pairs collected at the Υ(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. Bünger;O. Grünberg;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. Yèche;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. Va’vra;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., Bünger; O., Grünberg; T., Hartmann; T., Leddig; H., Schröder; R., Waldi; T., Adye; E. O., Olaiya; F. F., Wilson; S., Emery; G., Hamel de Monchenault; G., Vasseur; Yèche, 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., Va’Vra; 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
Erratum: Measurement of the D*(2010)+ natural linewidth and the D*(2010)+-D0 mass difference (Physical Review D (2010) 88 (052003) DOI:10.1103/PhysRevD.88.052003)
Search for lepton-number violating B+ -> X(-)l(+)l '(+) decays
We report on a search for eleven lepton-number violating processes B+\u2192X-\u2113+\u2113\u2032+ with X-=K-, \u3c0-, \u3c1-, K*-, or D- and \u2113+/\u2113\u2032+=e+ or \u3bc+, using a sample of 471\ub13 million BB\u304 events collected with the BABAR detector at the PEP-II e+e- collider at the SLAC National Accelerator Laboratory. We find no evidence for any of these modes and place 90% confidence level upper limits on their branching fractions in the range (1.5-26)
710-7. \ua9 2014 American Physical Society