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Register a new userInclusive and exclusive $bto s/dgamma$
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Authors
N. Taniguchi
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In this article, I review the recent results for inclusive and exclusive measurements for $bto sgamma$ and $bto dgamma$ decays from $B$ factories Belle and Babar. I describe the measurement of branching fraction and direct CP violating asymmetry for inclusive $Bto X_sgamma$ decay. For results of $bto dgamma$ process, I introduce the measurement of branching fraction of exclusive $bto dgamma$ modes, the first measurement for CP asymmetry of $bto dgamma$ process using $Btorhogamma$ mode, and semi-inclusive measurement for $Bto X_dgamma$.
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I report here recent measurements of observables from the inclusive decays $Bto X_sgamma$ and $Bto X_sell^+ell^-$. Included are measurements of the branching fractions and CP asymmetries for both channels, as well as the forward-backward lepton asymmetry in inclusive $Bto X_sell^+ell^-$ decays, which is the first measurement of this quantity.
We report new measurements of the decays $Btorho^+ gamma$, $B to rho^0 gamma$ and $B to omegagamma$ using a data sample of $657 times 10^6$ $B$ meson pairs accumulated with the Belle detector at the KEKB $e^+ e^-$ collider. We measure branching fractions ${cal B}(B^+ to rho^+ gamma) = (8.7^{+2.9}_{-2.7}{}^{+0.9}_{-1.1})times 10^{-7}$, ${cal B}(B^0 to rho^0 gamma) = (7.8^{+1.7}_{-1.6}{}^{+0.9}_{-1.0}) times 10^{-7}$ and ${cal B}(B^0 to omega gamma) = (4.0^{+1.9}_{-1.7} pm 1.3) times 10^{-7}$. We also report the isospin asymmetry $Delta (rhogamma) = -0.48^{+0.21}_{-0.19}{}^{+0.08}_{-0.09}$; and the first measurement of the direct CP-violating asymmetry $A_{CP}(B^+ to rho^+ gamma) = -0.11pm{0.32}pm{0.09}$, where the first and second errors are statistical and systematic, respectively.
The $b rightarrow s gamma$, $b rightarrow d gamma$ and $b rightarrow s ell^+ ell^-$ processes are allowed at higher order via the electroweak loop or box diagrams in the Standard model. It is sensitive probe to search for new physics beyond the Standard model because new particles might enter in the loop. We present preliminary results of branching fraction of the $bar{B} rightarrow X_s gamma$, $CP$ asymmetry in the $bar{B} rightarrow X_{s+d} gamma$, and the forward-backward asymmetry in the $bar{B} rightarrow X_s ell^+ ell^-$. The results are based on a data sample containing $772 times 10^6 Bbar{B}$ pairs recorded at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider.
We report inclusive and exclusive measurements for $chi_{c1}$ and $chi_{c2}$ production in $B$ decays. We measure $mathcal{B}(B to chi_{c1} X)$= $(3.03 pm 0.05(mbox{stat}) pm 0.24(mbox{syst})) times 10^{-3}$ and $mathcal{B}(B to chi_{c2} X)$= $(0.70 pm 0.06(mbox{stat}) pm 0.10(mbox{syst})) times 10^{-3}$. For the first time, $chi_{c2}$ production in exclusive $B$ decays in the modes $B^0 to chi_{c2}pi^- K^+$ and $B^+ to chi_{c2} pi^+ pi^- K^+$ has been observed, along with first evidence for the $B^+ to chi_{c2} pi^+ K_S^0$ decay mode. For $chi_{c1}$ production, we report the first observation in the $B^+ to chi_{c1} pi^+ pi^- K^+$, $B^0 to chi_{c1} pi^+ pi^- K_S^0$ and $B^0 to chi_{c1} pi^0 pi^- K^+$ decay modes. Using these decay modes, we observe a difference in the production mechanism of $chi_{c2}$ in comparison to $chi_{c1}$ in $B$ decays. In addition, we report searches for $X(3872)$ and $chi_{c1}(2P)$ in the $B^+ to (chi_{c1} pi^+ pi^-) K^+$ decay mode. The reported results use $772 times 10^{6}$ $Boverline{B}$ events collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
We report on the measurement of inclusive charmless semileptonic B decays $B to X_{u} ell u$. The analysis makes use of hadronic tagging and is performed on the full data set of the Belle experiment comprising 772 million $Bbar{B}$ pairs. In the proceedings, the preliminary results of measurements of partial branching fractions and the CKM matrix element $|V_{ub}|$ are presented.
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