Showing 2001 · hep-phShow all

14 papers · 2 filters

hep-ph2001★ 78 cited

Effects of the Intergalactic Plasma on Supernova Dimming via Photon-Axion Oscillations

Csaba Csaki, Nemanja Kaloper, John Terning

We have recently proposed a mechanism of photon-axion oscillations as a way of rendering supernovae dimmer without cosmic acceleration. Subsequently, it has been argued that the in…

hep-ph2001★ 2 cited

Flavor-Change with Ultra-Light Sbottom and Gluinos

Thomas Becher, Stephan Braig, Alex Kagan +1

Implications of a 2 - 5.5 GeV sbottom and 12 - 16 GeV gluino masses for rare B decay phenomenology are discussed. An effective Hamiltonian is constructed in which the gluinos are i…

hep-ph2001★ 3 cited

Theory of CP Violation in the B-Meson System

Matthias Neubert

Recent developments in the theory of CP violation in the B-meson system are reviewed, with focus on the determination of sin(2beta) from B-> J/psi K decays, its implications for te…

hep-ph2001★ 3 cited

Aspects of QCD Factorization

Matthias Neubert

The QCD factorization approach provides the theoretical basis for a systematic analysis of nonleptonic decay amplitudes of B mesons in the heavy-quark limit. After recalling the ba…

hep-ph2001★ 97 cited

Isospin Breaking in B -> K^* gamma Decays

Alexander L. Kagan, Matthias Neubert

A calculation of the leading isospin-breaking contributions to the B -> K^* gamma decay amplitudes based on the QCD factorization approach is presented. They arise at order Lambda/…

hep-ph2001★ 75 cited

Comments on Color-Suppressed Hadronic B Decays

Matthias Neubert, Alexey A. Petrov

Recent experimental results on the color-suppressed nonleptonic decays B^0 -> D^{(*)0} pi^0 provide evidence for a failure of the naive factorization model and for sizeable relativ…

hep-ph2001★ 18 cited

The Potential for Neutrino Physics at Muon Colliders and Dedicated High Current Muon Storage Rings

I. Bigi, T. Bolton, J. Formaggio +11

Conceptual design studies are underway for muon colliders and other high-current muon storage rings that have the potential to become the first true ``neutrino factories''. Muon de…

hep-ph2001★ 1 cited

Particle Horizon and Warped Phenomenology

Horace Stoica, S. -H. Henry Tye, Ira Wasserman

Giant resonances of gravity Kaluza-Klein modes (with tensor couplings) in high energy collisions are expected in the Randall-Sundrum orbifold model that incorporates a plausible so…

hep-ph2001★ 12 cited

Improved Determination of |V_{ub}| from Inclusive Semileptonic B-Meson Decays

Matthias Neubert, Thomas Becher

We reduce the perturbative uncertainty in the determination of |V_{ub}| from inclusive semileptonic B decays by calculating the rate of B -> X_u l nu events with dilepton invariant…

hep-ph2001★ 881 cited

QCD Factorization in B -> pi K, pi pi Decays and Extraction of Wolfenstein Parameters

M. Beneke, G. Buchalla, M. Neubert +1

In the heavy-quark limit, the hadronic matrix elements entering nonleptonic -meson decays into two light mesons can be calculated from first principles including ``nonfactorizab…

hep-ph2001★ 25 cited

Note on the Extraction of |V_{ub}| using Radiative B Decays

Matthias Neubert

The element |V_{ub}| of the quark mixing matrix can be extracted with small theoretical uncertainties by combining weighted integrals over the endpoint regions of the lepton spectr…

hep-ph2001★ 144 cited

Low energy analysis of pi N --> pi N

T. Becher, H. Leutwyler

We derive a representation for the pion nucleon scattering amplitude that is valid to the fourth order of the chiral expansion. To obtain the correct analytic structure of the sing…

hep-ph2001★ 12 cited

Asymptotics of QCD Factorization in Exclusive Hadronic Decays of B Mesons

Thomas Becher, Matthias Neubert, Ben D. Pecjak

Using the renormalon calculus, we study the asymptotic behavior of the perturbative expansion of the hard-scattering kernels entering the QCD factorization formula for the nonlepto…

hep-ph2001★ 12 cited

Everyone Makes Mistakes - Including Feynman

Toichiro Kinoshita

This talk is dedicated to Alberto Sirlin in celebration of his seventieth birthday. I wish to convey my deep appreciation of his many important contributions to particle physics ov…