Sequestering in models of F-term uplifting

We discuss the nature of sequestering supersymmetry breaking sectors in a certain class of moduli stabilization in supergravity/string models, where a negative vacuum energy of the nonperturbative moduli potential is canceled by dynamically generated F-terms. Two illustrating examples are shown to sketch the issues around the supersymmetry breaking, flavors and sequestering within such a framework.Comment: 6 pages, no figure; Talks given at PASCOS08 (the 14th International Symposium on Particles, Strings and Cosmology, Waterloo, Canada, June 2-6, 2008) and SUSY08 (the 16th International Conference on Supersymmetry and the Unification of Fundamental Interactions, Seoul, Korea, June 16-21, 2008

Problems of Double Charm Production in e+e−e^+e^- Annihilation at s=10.6\sqrt{s}=10.6 GeV

Using the nonrelativistic QCD(NRQCD) factorization formalism, we calculate the color-singlet cross sections for exclusive production processes ${e^++e^-\to J/\psi+\eta_c}$~ and ~$e^++e^-\to J/\psi + \chi_{cJ}$~$(J=0,1,2)$ at the center-of-mass energy $\sqrt{s}$=10.6 GeV. The cross sections are estimated to be 5.5fb, 6.7fb, 1.1fb, and 1.6fb for $\eta_c, \chi_{c0}, \chi_{c1}$ and $\chi_{c2}$, respectively. The calculated $J/\psi+\eta_c$ production rate is smaller than the recent Belle data by about an order of magnitude, which might indicate the failure of perturbative QCD calculation to explain the double-charmonium production data. The complete $\cal{O}$$(\alpha^2_{s})$ color-singlet cross section for ${e^++e^-\to \chi_{c0}+ c\bar {c}}$ is calculated. In addition, we also evaluate the ratio of exclusive to inclusive production cross sections. The ratio of $J/\psi\eta_c$ production to $J/\psi c\bar{c}$ production could be consistent with the experimental data.Comment: 10 pages, 4 figures. A few references added, errors and typoes correcte

Electroproduction of psi' and polarized gluon distribution in a proton

In order to get information about the polarized gluon distribution in a proton, we studied the electroproduction of \psi' in polarized electron and polarized proton collisions in the framework of the NRQCD factorization approach. The value of the cross section d\Delta\sigma / dp_T^2 for color-octet mechanism is about 5 times larger than that for color-singlet one, and it might be another test of the color-octet model if the polarized gluon distribution \Delta g(x) is well known. Furthermore, we found that this reaction is quite effective for testing the model of gluon polarization by measuring the double spin asymmetry A_{LL} for the initial electron and proton. Though the shape of p_T^2 distribution of A_{LL} is quite similar for the production mechanism with color-octet and color-singlet, we can see a big difference in A_{LL} among various models of the polarized gluon distribution function \Delta g(x).Comment: 9 pages, 6 figure

Direct dark matter search with the full data set of XMASS-I

XMASS-I was unique experiment, as single phase, large volume liquid xenon detector observation was carried out during Nov. 20, 2013 to Feb. 1, 2019. Including WIMP dark matter searches, many rare event search results by using XMASS-I data were reported so far, such as dark photon, axion, axion-like particle, double electron capture. After the end of the long stable data acquisition, analysis for WIMP dark matter searches with full data set was processed. The analysis with total accumulated live time of 1590.9 days for the normal threshold trigger(> 1 keVee) and 768.8 days for the low threshold trigger (>0.5keVee) with 832kg of liquid xenon have been done. Two search analyses were done with almost 5 years long stable data set. One is the fiducial volume analysis in which nuclear recoil signal was searched in the detector’s fiducial volume, which contained 97kg of liquid xenon. The other is the annual modulation analysis which signal was searched on all target volumes of 832kg. In addition to nuclear recoil signal, signal from bremsstrahlung effect and Migdal effect were also searched in the modulation analysis. In the present circumstance for the dark matter searches, search by various methods is becoming more important than ever. The results from XMASS-I full data set are unique and very valuable results

B Decays at BABAR

We present branching fraction and CP asymmetry results for a variety of B decays based on up to 56.4 fb^-1 collected by the BaBar experiment running near the Upsilon(4S) resonance at the PEP-II e+e- B-factory.Comment: 10 pages, 6 figures, presented at QCD02: High Energy Physics International Conference in Quantum Chromodynamics, Montpellier, France, 2-9 Jul 200

J/psi Inclusive Production in ep Deep-Inelastic Scattering at DESY HERA

We calculate the cross section of J/psi plus jet associated production in ep deep-inelastic scattering within the factorization formalism of nonrelativistic quantum chromodynamics. Our analytic results disagree with previous analyses, both for the colour-singlet and colour-octet channels. Our theoretical predictions agree reasonably well with recent data taken by the H1 Collaboration at DESY HERA, significantly better than those obtained within the colour-singlet model.Comment: 27 pages (Latex), 9 figures (Postscript), to appear in Nucl. Phys.

Quarkonium Photoproduction at Next-to-leading Order

We present the calculation of O(as^2 aem) corrections to heavy-quarkonium total photoproduction cross-sections. Results are given for the colour-octet component of S and P waves. The calculation is performed using covariant projectors in dimensional regularization. A phenomenological study of the results, including a discussion of the high-energy behaviour of the cross sections, is presented. For gamma-p energies up to few hundred GeV the NLO corrections significantly reduce the scale dependence of the production rates relative to the Born-level results. Large small-x corrections arise at higher energies, making the predictions strongly dependent on the shape of the gluon density and on the choice of factorization scale.Comment: 32 pages, Latex, epsfig, 13 figure

Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA

We study J/psi photoproduction via fragmentation at next-to-leading order in the QCD-improved parton model, using the nonrelativistic factorization formalism proposed by Bodwin, Braaten, and Lepage. We consider direct and resolved photoproduction of prompt J/psi mesons and chi_{cJ} mesons radiatively decaying to J/psi+gamma, taking into account the formation of both color-singlet and color-octet c anti-c states. Adopting the values of the long-distance color-octet matrix elements extracted from fits to prompt-J/psi data recently taken at the Fermilab Tevatron, we predict that measurements of J/psi photoproduction at DESY HERA should show a distinctive excess over the expectation based on the color-singlet model at small values of the inelasticity variable z. This is complementary to the expected enhancement at z close to 1 due to the color-octet contribution to photon-gluon fusion.Comment: 10 pages (Latex), 3 figures (Postscript

J/psi Production: Tevatron and Fixed-Target Collisions

In this talk I show the results of a fit of the NRQCD matrix elements to the CDF data for direct $J/\psi$ production, by including the radiative corrections to the colour-singlet channel and the effect of the $k_T$-smearing. Furthermore I perform the NLO NRQCD analysis of $J/\psi$ production in fixed-target proton-nucleon collisions and I fit the colour-octet matrix elements to the available experimental data. The results are compared to the Tevatron ones.Comment: 6 pages, 3 figures. Talk given at the QCD99 Euroconference, Montpellier, France, July 199

Charmonium Hybrid Production in Exclusive B Meson Decays

Recent data on charmonium production in B-meson decays suggest that charmonium hybrid mesons with mass ~4 GeV may be produced in B-decay via c\bar{c} colour octet operators. Some of these states are likely to be narrow with clean signatures to J/\psi pi^+ pi^- final states. Experimental signatures and search strategies for existing B-factories are described.Comment: references added and some of the text rewritten so it is cleare