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Nakazawa, H.,Uehara, S.,Abe, K.,Abe, K.,Aihara, H.,Akatsu, M.,Asano, Y.,Aulchenko, V.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Ban, Y.,Banerjee, S.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,B Elsevier 2005 Physics letters: B Vol.615 No.1
<P><B>Abstract</B></P><P>We have measured <SUP>π+</SUP><SUP>π−</SUP> and <SUP>K+</SUP><SUP>K−</SUP> production in two-photon collisions using 87.7<SUP>fb−1</SUP> of data collected with the Belle detector at the asymmetric energy <SUP>e+</SUP><SUP>e−</SUP> collider KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (<I>W</I>) range between 2.4GeV<W<4.1GeV and angular region |cos<SUP>θ∗</SUP>|<0.6. The cross section ratio σ(γγ→<SUP>K+</SUP><SUP>K−</SUP>)/σ(γγ→<SUP>π+</SUP><SUP>π−</SUP>) is measured to be 0.89±0.04(stat.)±0.15(syst.) in the range of 3.0GeV<W<4.1GeV, where the ratio is energy-independent. We observe a <SUP>sin−4</SUP><SUP>θ∗</SUP> behavior of the cross section in the same <I>W</I> range. Production of <SUB>χc0</SUB> and <SUB>χc2</SUB> mesons is observed in both γγ→<SUP>π+</SUP><SUP>π−</SUP> and γγ→<SUP>K+</SUP><SUP>K−</SUP> modes.</P>
Study ofπ0pair production in single-tag two-photon collisions
Masuda, M.,Uehara, S.,Watanabe, Y.,Nakazawa, H.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behe American Physical Society 2016 Physical Review D Vol.93 No.3
<P>We report a measurement of the differential cross section of pi(0) pair production in single-tag two-photon collisions, gamma*gamma -> pi(0) pi(0), in e(+) e(-) scattering. The cross section is measured for Q(2) up to 30 GeV2, where Q(2) is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and vertical bar cos theta*vertical bar < 1.0 for the total energy and pion scattering angle, respectively, in the gamma*gamma center-of-mass system. The results are based on a data sample of 759 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. The transition form factor of the f(0)(980) and that of the f(2)(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.</P>
Isomorphic coalescence of aster cores formed <i>in vitro</i> from microtubules and kinesin motors
Kim, K,Sikora, A,Nakazawa, H,Umetsu, M,Hwang, W,Teizer, W IOP 2016 Physical Biology Vol.13 No.5
<P>We report fluorescence microscopy studies of the formation of aster-like structures emerging from a cellular element-based active system and a novel analysis of the aster condensation. The system consists of rhodamine labeled microtubules which are dynamically coupled by functionalized kinesin motor proteins cross-linked via streptavidin-coated quantum dots (QDs). The aster-shaped objects contain core structures. The cores are aggregates of the QD-motor protein complexes, and result from the dynamic condensation of sub-clusters that are connected to each other randomly. The structural specificity of the aster core reflects a configuration of the initial connectivity between sub-clusters. Detailed image analysis allows us to extract a novel correlation between the condensation speed and the sub-cluster separation. The size of the core is scaled down during the condensation process, following a power law dependence on the distance between sub-clusters. The exponent of the power law is close to two, as expected from a geometric model. This single exponent common to all the contractile lines implies that there exists a time regime during which an isomorphic contraction of the aster core continues during the condensation process. We analyze the observed contraction by using a model system with potential applicability in a wide range of emergent phenomena in randomly coupled active networks, which are prevalent in the cellular environment.</P>
High-statistics study ofηπ0production in two-photon collisions
Uehara, S.,Watanabe, Y.,Nakazawa, H.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Bakich, A. M.,Belous, K.,Bondar, A.,Brač,ko, M.,Browder, T. E.,Chang, P.,Chen, A.,Cheon, B. G.,Chistov, R.,C American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.3