arXiv subjects

A. Somov

Publications and source records attributed to A. Somov.

22 records · Page 2Linked to original sources

arXiv2006

Measurement of the branching fraction, polarization, and CP asymmetry for B0->rho+rho- decays, and determination of the CKM phase phi_2

We have measured the branching fraction B, longitudinal polarization fraction f_L, and CP asymmetry coefficients A and S for B0->rho+rho- decays with the Belle detector at the KEKB e+e- collider using 253 fb-1 of data. We obtain B = [22.8 +-3.8 (stat) +2.3 -2.6 (syst) ] x 10-6, f_L = 0.941 +0.034 -0.040 (stat) +-0.030 (syst), A = 0.00 +-0.30 (stat) +-0.09 (syst), and S = 0.08 +-0.41 (stat) +-0.09 (syst). These values are used to constrain the Cabibbo-Kobayashi-Maskawa phase phi_2; the solution consistent with the Standard Model is phi_2 = (88 +-17) degrees or 59 deg.< phi_2 < 115 deg. at 90% CL.

hep-ex↗

arXiv2005

Phi_2 (alpha) measurement using B -> rho pi decays at Belle

We present measurements of time-dependent asymmetries in decays of neutral B mesons to the final states B0 -> rho+ pi-. Measurements are based on a 140 fb-1 data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.

hep-ex↗

arXiv1998

$Υ$ Polarization at HERA-$B$

The production of $Υ$ mesons in fixed target $pN$ collisions is considered. It is shown that Non-Relativistic QCD predicts $Υ$ states to be produced with sizeable transverse polarization. The possibility of a measurement of the $Υ$ polarization at the HERA-$B$ experiment is discussed.

hep-ph↗

arXiv1997

Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV

Charged pion spectra measured in 58Ni-58Ni collisions at 1.06, 1.45 and 1.93 AGeV are interpreted in terms of a thermal model including the decay of Delta resonances. The transverse momentum spectra of pions are well reproduced by adding the pions originating from the Delta-resonance decay to the component of thermal pions, deduced from the high transverse momentum part of the pion spectra. About 10 and 18% of the nucleons are excited to Delta states at freeze-out for beam energies of 1 and 2 AGeV, respectively.

nucl-ex↗