Scientific Commons: M. Hazumi

B, D and K decays (2008)

Buchalla, G., Komatsubara, T. K., Muheim, F., Silvestrini, L., Artuso, M., Asner, D. M., ...

The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of...

Measurement of azimuthal asymmetries in inclusive production of hadron pairs in e^＋e^－ annihilation at √s = 10.58 GeV (2008)

Seidl, R., Grosse Perdekamp, M., Ogawa, A., Adachi, I., Aihara, H., Bahinipati, S., ...

The Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around the quark’s momentum vector. Using two different reconstruction...

Observation of a Resonancelike Structure in the π^+-Ψ' Mass Distribution in Exclusive B → Kπ^+-Ψ' Decays (2008)

Olsen, S. L., Adachi, I., Aihara, H., Aulchenko, V., Aushev, T., ...

A distinct peak is observed in the π^±Ψ'invariant mass distribution near 4.43 GeV in B→ Kπ^±Ψ' decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M = 4433±...

Search for \bar{B}^0 →Λ_c^+\bar{Λ}_c^- decay at Belle (2008)

Uchida, Y., Ozaki, H., Kichimi, H., Adachi, I., Aihara, H., Arinstein, K., ...

We search for the doubly charmed baryonic decay \bar{B}^0 →Λ_c^+\bar{Λ}_c^-, in a data sample of 520×106 B\bar{B} events accumulated at the Υ(4S) resonance with the Belle detector at the KEKB...

Observation of D_s1(2536)^+　→ D^+π^-K^+ and angular decomposition of D_s1(2536)^+ →D^*+K_S^0 (2008)

Balagura, V., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., ...

Using 462 fb^{-1} of e^+e^- annihilation data recorded by the Belle detector, we report the first observation of the decay D_s1(2536)^+　→　D+π^-K^+. The ratio of branching fractions...

Observation of the Ψ(4415)→ D\bar{D}_2^* (2460) Decay Using Initial-State Radiation (2008)

Pakhlova, G., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., ...

We report measurements of the exclusive cross section for e^+e^-　→D^0D^-π^+ over the center-of-mass energy range 4.0 GeV to 5.0 GeV with initial-state radiation and the first observation of the...

B, D and K decays (2008)

Buchalla, G., Komatsubara, T. K., Muheim, F., Silvestrini, L., Artuso, M., Asner, D. M., ...

With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While...

Observation of e^+e^-　→ K^+K^-J/Ψ via initial-state radiation at Belle (2008)

Yuan, C. Z., Shen, C. P., Wang, P., Wang, X. L., Adachi, I., Aihara, H., ...

The process e^+e^- →K^+K^-J/Ψ is observed for the first time via initial-state radiation. The cross section of e^+e^- → K^+K^-J/Ψ for center-of-mass energies between threshold and 6.0 GeV is...

Time-Dependent CP-Violating Asymmetry in B^0→p^0γ Decays (2008)

Ushiroda, Y., Sumisawa, K., Taniguchi, N., Adachi, I., Aihara, H., Arinstein, K., ...

We report the first measurement of CP-violation parameters in B^0 → p^0γ decays based on a data sample of 657×10^6B\bar{B} pairs collected with the Belle detector at the KEKB asymmetric-energy...

On the Physics Case of a Super Flavour Factory (2007)

Browder, T, Ciuchini, M, Gershon, T, Hazumi, M, Hurth, Tobias, Okada, Y, ...

We summarize the physics case of a high-luminosity e+e- flavour factory collecting an integrated luminosity of 50-75 ab^(-1). Many New Physics sensitive measurements involving B and D mesons and tau...

On the Physics Case of a Super Flavour Factory (2007)

Browder, T., Ciuchini, M., Gershon, T., Hazumi, M., Hurth, T., Okada, Y., ...

We summarize the physics case of a high-luminosity e+e- flavour factory collecting an integrated luminosity of 50-75 ab^(-1). Many New Physics sensitive measurements involving B and D mesons and tau...

Measurement of branching fraction and time-dependent CP asymmetry parameters in B^0 → D^*+D^*-K^{0}_{S}decays (2007)

Dalseno, J., Adachi, I., Aihara, H., Aushev, T., Bakich, A. M., Balagura, V., ...

We present a measurement of the branching fraction and time-dependent CP violation parameters for B^0 → D^*+D^*-K^{0}_{S} decays. These results are obtained from a 414 fb^{-1} data sample that...

Search for the CP-violating decays $\Upsilon(4S) B0\bar{B}0 J/K0_S + J/\psi(\eta_c)K0_S$ (2007)

Tajima, O., Hazumi, M, Collaboration, For The Belle

We report the first search for CP violating decays of the $\Upsilon(4S)$ using a data sample that contains 535 million $\Upsilon(4S)$ mesons with the Belle detector at the KEKB asymmetric-energy e^+...

Measurements of exclusive B^{0}_{s} decays at the γ(5S) resonance (2007)

Drutskoy, A., Abe, K., Adachi, I., Aihara, H., Anipko, D., Bakich, A. M., ...

Several exclusive B^{O}_{s} decays are studied using a 1.86 fb^{-1} data sample collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric energy e^+e^- collider. In the...

Search for B decays into η'p, η'K^*, η'φ, η'ω and η'η^(') (2007)

Schümann, J., Wang, C. H., Abe, K., Aihara, H., Anipko, D., Arinstein, K., ...

We report on a search for the exclusive two-body charmless hadronic B meson decays B → η'ρ, B → η'K^*, B^0 → ηφ, B^0 → η'ω, and B0 →η'η^('). The results are obtained from a data...

Search for Invisible Decay of the Υ(1S) (2007)

Tajima, O., Hayashii, H., Hazumi, M., Inami, K., Iwasaki, Y., Uehara, S., ...

We report results of a search for the invisible decay of the Υ(1S) via the Υ(3S)→π+π-Υ(1S) transition using a data sample of 2.9 fb^{-1} at the Υ(3S) resonance. The data were collected with...

New Measurements Using External Photon Conversion at a High Luminosity B Factory (2007)

Ishino, H., Hazumi, M., Nakao, M., Yoshikawa, T.

We propose two novel methods for testing the standard model using external photon conversion at a high-luminosity e^+e^- B factory proposed recently. The first method is to measure the mixing-induced...

Search for Invisible Decay of the $\Upsilon(1S)$ (2006)

Hayashii, H., Hazumi, M., Inami, K., Iwasaki, Y., Uehara, S.

We report results of a search for the invisible decay of the Upsilon(1S) via the Upsilon(3S)->pi+pi-Upsilon(1S) transition using a data sample of 2.9 fb^{-1} at the Upsilon(3S) resonance. The data...

Observation of B^+ → Λ^+_c Λ^－_c K^+ and B^0 → Λ^+_c Λ^－_c K^0 Decays (2006)

Gabyshev, N., Abe, K., Abe, K., Adachi, I., Aihara, H., Asano, Y., ...

We report the first measurements of the doubly charmed baryonic B decays B → Λ^+_c Λ^-_c K. The B+ → Λ^+_c Λ^-_c K+ decay is observed with a branching fraction of (6.5^{+1.0}_{-0.9}...

The Discovery Potential of a Super B Factory (2005)

Hewett, JoAnne. L., Hitlin, David G., Abe, T., Agashe, K., Albert, J., Ali, A., ...

The Proceedings of the 2003 SLAC Workshops on flavor physics with a high luminosity asymmetric e+e- collider. The sensitivity of flavor physics to physics beyond the Standard Model is addressed in...

Branching Fraction, Polarization and CP-Violating Asymmetries in B0 -> D*+ D*- Decays (2005)

Miyake, H., Hazumi, M., Collaboration, For The Belle

We present measurements of the branching fraction, the polarization parameters and CP-violating asymmetries in B0 -> D*+ D*- decays using a 140/fb data sample collected at the Upsilon(4S) resonance...

Physics at Super B Factory (2004)

Akeroyd, A. G., Bartel, W., Bondar, A., Browder, T. E., Drutskoy, A., Enari, Y., ...

This report presents the results of studies that investigate the physics reach at a Super B factory, an asymmetric-energy e^+e^- collider with a design luminosity of 5 x 10^35 cm^-2s^-1, which is...

Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle (2004)

Kakuno, H., Hara, K., Casey, B. C. K., Hamasaki, H., Hazumi, M., ...

We describe a flavor tagging algorithm used in measurements of the CP violation parameter sin2phi_1 at the Belle experiment. Efficiencies and wrong tag fractions are evaluated using flavor-specific B...

Proper-time Resolution Function for Measurement of Time Evolution of B Mesons at the KEK B-Factory (2003)

Tajima, H., Aihara, H., Higuchi, T., Kawai, H., Nakadaira, T., Tanaka, J., ...

The proper-time resolution function for the measurement of the time evolution of B mesons with the Belle detector at KEKB is studied in detail. The obtained resolution function is applied to the...

Radiative B meson decays into K pi gamma and K pi pi gamma final states (2002)

Nishida, S, Nakao, M, Abe, K, Abe, K, Abe, T, Ahn, BS, ...

Mesurement of the B0 - anti-B0 Mixing Parameter Delta m_d using Semileptonic B0 Decays (2002)

Collaboration, Belle, Hara, K., Hazumi, M.

We present a measurement of the B^0-B^0bar mixing parameter Delta m_d using neutral B meson pairs in a 29.1 fb^{-1} data sample collected at the Upsilon(4S) resonance with the Belle detector at the...

silicon vertex detector (1999)

M. Tanaka, M. Hazumi, J. Ryuko, K. Sumisawa, D. Marlow

A newly developed system for the control and readout of the BELLE silicon vertex detector (SVD) is described. The system is designed to meet the mechanical, electrical, and thermal requirements...

Measurement of the spatial resolution of wide-pitch silicon strip detectors with large incident angle (1997)

Kawasaki, T, Hazumi, M, Nagashima, Y, Senyo, K, Sumisawa, K, Takegai, T, ...

Performance of a double-sided silicon microstrip detector with a wide-pitch N-side readout using a field-plate and a multi P-stop structure (1997)

Saitô, Y, Akamine, T, Inoue, M, Yamanaka, J, Echigo, N, Miyahara, S, ...

Exclusive $\varrho^{0}$ production in deep inelastic electron-proton scattering at HERA (1995)

Derrick, Malcolm, Krakauer, D A, Magill, S, Mikunas, D, Musgrave, B, Repond, J, ...

Inclusive jet cross sections for events with a large rapidity gap with respect to the proton direction from the reaction ep \rightarrow jet \; + \; X with quasi-real photons have been measured with...

Dijet cross-sections in photoproduction at HERA (1995)

ZEUS Collaboration, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, ...

Diffractive hard photoproduction at HERA and evidence for the gluon content of the pomeron (1995)

ZEUS Collaboration, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, ...

Inclusive transverse momentum distributions of charged particles in diffractive and nondiffractive photoproduction at HERA (1995)

ZEUS Collaboration, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, ...

Exclusive rho0 production in deep inelastic electron - proton scattering at HERA (1995)

ZEUS Collaboration, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, ...

Inclusive charged particle distributions in deep inelastic scattering events at HERA (1995)

ZEUS Collaboration, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, ...

Jet production in high Q**2 deep inelastic e p scattering at HERA (1995)

ZEUS Collaboration, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, ...