arXiv subjects

I. Dunietz

Publications and source records attributed to I. Dunietz.

4 recordsLinked to original sources

arXiv2005

A Search for the Higgs Boson using Very Forward Tracking Detectors with CDF

We propose to add high precision track detectors 55m downstream on both (E&W) sides of CDF, to measure high Feynman-x protons and antiprotons in association with central states. A primary motivation is to search for the Higgs boson, and if it is seen to measure its mass precisely. The track detectors will be silicon strip telescopes backed up by high resolution time-of-flight counters. The addition of these small detectors effectively converts the Tevatron into a gluon-gluon collider with sqrt{s} from 0 to ~ 200 GeV. This experiment will also measure millions/year clean high-|t| elastic scattering events and produce millions of pure gluon jets. Besides a wealth of unique QCD studies we will search for signs of exotic physics such as SUSY and Large Extra Dimensions.

hep-ex↗

arXiv1997

Gluonic Hadrons and Charmless B Decays

Hybrid charmonium with mass ~4 GeV could be produced via a c c.bar color-octet component in b->c c.bar s. These states could be narrow and could have a significant branching ratio to light hadrons, perhaps enhanced by glueballs. Decays to gluonic hadrons could make a sizable contribution to B->no charm decays. Experimental signatures and search strategies are discussed.

hep-ph↗

arXiv1996

Decay constants of P and D-wave heavy-light mesons

We investigate decay constants of P and D-wave heavy-light mesons within the mock-meson approach. Numerical estimates are obtained using the relativistic quark model. We also comment on recent calculations of heavy-light pseudo-scalar and vector decay constants.

hep-ph↗

arXiv1996

Width Difference in the $B_s-\bar{B_s}$ System

We use the heavy quark expansion to investigate the width difference $ΔΓ_{B_s}$ between the $B_s$ mass eigenstates. The corrections of ${\cal O}(Λ_{QCD}/m_b)$ and ${\cal O}(m_s/m_b)$ to the leading order expression in the operator product expansion are derived and estimated to yield a sizable reduction of the leading result for $ΔΓ_{B_s}$ by typically $30\%$. For completeness we also quantify small effects due to penguin operators and CKM suppressed contributions. Based on our results we discuss the prediction for $(ΔΓ/Γ)_{B_s}$ with particular emphasis on theoretical uncertainties. We find $(ΔΓ/Γ)_{B_s}=0.16^{+0.11}_{-0.09}$, where the large error is dominated by the uncertainty in hadronic matrix elements. An accuracy of about $10\%$ in $(ΔΓ/Γ)_{B_s}$ should be within reach, assuming continuing progress in lattice calculations. In addition we address phenomenological issues and implications of a $ΔΓ_{B_s}$ measurement for constraints on $ΔM_{B_s}$ and CKM parameters. We further consider in some detail the lifetime ratio $τ(B_s)/τ(B_d)$ and estimate that, most likely, $|τ(B_s)/τ(B_d)-1|<1\%$.

hep-ph↗