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 $B^0 \to \pi^+ \pi^-$, $B^0 \to K^+ \pi^-$, and $B^0 \to \pi^0 \pi^0$, and of the branching fractions for $B^0 \to \pi^0 \pi^0$ and $B^0 \to K^0 \pi^0$. The results are obtained with the full data set collected at the $\Upsilon(4S)$ resonance by the BABAR experiment at the PEP-II asymmetric-energy $B$ factory at the SLAC National Accelerator Laboratory, corresponding to $467 \pm 5$ million $B\bar B$ pairs. We find the CP-violation parameter values and branching fractions $S_{\pi^+\pi^-} = -0.68 \pm 0.10 \pm 0.03, C_{\pi^+\pi^-} = -0.25 \pm 0.08 \pm 0.02, A_{K^-\pi^+} = -0.107 \pm 0.016 ^{+0.006}_{-0.004}, C_{\pi^0\pi^0} = -0.43 \pm 0.26 \pm 0.05, Br(B^0 \to \pi^0 \pi^0) = (1.83 \pm 0.21 \pm 0.13) \times 10^{-6}, Br(B^0 \to K^0 \pi^0) = (10.1 \pm 0.6 \pm 0.4) \times 10^{-6},$ 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 $B^0 \to\pi^+\pi^-$ and 6.1 standard deviations for $B^0 \to K^+ \pi^-$, including systematic uncertainties. Constraints on the Unitarity Triangle angle $\alpha$ are determined from the isospin relations among the $B \to \pi\pi$ rates and asymmetries. Considering only the solution preferred by the Standard Model, we find $\alpha$ to be in the range $[71^\circ,109^\circ]$ 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]

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.

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

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

Observation of B0B^0 Meson Decay to a1±(1260)π∓a^\pm_1(1260) \pi^\mp

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

Measurement of the hadronic form factor in D0→K-e+νe decays

The shape of the hadronic form factor f(+)(q(2)) in the decay D-0 -> K(-)e(+)nu(e) has been measured in a model independent analysis and compared with theoretical calculations. We use 75 fb(-1) of data recorded by the BABAR detector at the PEP-II electron-positron collider. The corresponding decay branching fraction, relative to the decay D-0 -> K-pi(+), has also been measured to be R-D=B(D-0 -> K(-)e(+)nu(e)(gamma))/B(D-0 -> K-pi(+)(gamma))=0.927 +/- 0.007 +/- 0.012. From these results, and using the present world average value for B(D-0 -> K-pi(+)), the normalization of the form factor at q(2)=0 is determined to be f(+)(0)=0.727 +/- 0.007 +/- 0.005 +/- 0.007 where the uncertainties are statistical, systematic, and from external inputs, respectively