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Jonathan L. Rosner

Publications and source records attributed to Jonathan L. Rosner.

At least 145 records · Page 8Linked to original sources
arXiv2006

Suppression of flavor symmetry breaking in B decay sum rules

While flavor symmetries are useful for studying hadronic B decays, symmetry relations for amplitudes and decay rates are usually violated by first order symmetry breaking corrections. We point out two cases in which first order symmetry breaking is suppressed by a small ratio of amplitudes: (1) An isospin sum rule for four $B\to Kπ$ decays, where isospin breaking is shown to be negligible. (2) An SU(3) sum rule for pairs of $B\to Kπ$ and $B\to Kη_8$, generalized to pairs of $B\to Kπ, B\to Kη$ and $B\to Kη'$.

hep-ph↗
arXiv2005

Symmetry relations in charmless B->PPP decays

Strangeness-changing decays of $B$ mesons to three-body final states of pions and kaons are studied, assuming that they are dominated by a $ΔI=0$ penguin amplitude with flavor structure $\bar b \to \bar s$. Numerous isospin relations for $B\to Kππ$ and for underlying quasi-two-body decays are compared successfully with experiment, in some cases resolving ambiguities in fitting resonance parameters. The only exception is a somewhat small branching ratio noted in $B^0\to K^{*0}π^0$, interpreted in terms of destructive interference between a penguin amplitude and an enhanced electroweak penguin contribution. Relations for B decays into three kaons are derived in terms of final states involving $K_S$ or $K_L$, assuming that $ϕK$-subtracted decay amplitudes are symmetric in $K$ and $\bar K$, as has been observed experimentally. Rates due to nonresonant backgrounds are studied using a simple model, which may reduce discrete ambiguities in Dalitz plot analyses.

hep-ph↗
arXiv2005

Dark Matter in Many Forms

Since ordinary matter constitutes about 4% of the closure density of the Universe while dark matter constitutes about six times as much, it is urged that searches for dark matter consider that it may exist in several forms. Implications for detection and hadron and $e^+ e^-$ colliders are discussed.

astro-ph↗
arXiv2005

CLEO Dalitz plot results

Present and future contributions of the CLEO experiment to the study of $D$ Dalitz plots are presented. Such Dalitz plots can be of help in determining weak phases from $B \to D K$ decays.

hep-ex↗
arXiv2005

Psi'' decays to charmless final states

The importance of measuring the non-$D \bar D$ decays of the $ψ'' = ψ(3770)$ resonance is discussed. These decays can shed light on a possible discrepancy between the total and $D \bar D$ cross sections at the $ψ''$, and on a proposed mechanism for enhancement of penguin amplitudes in $B$ meson decays through charm--anticharm annihilation. Measurements (including the $ψ''$ line shape) in states of definite G-parity and in inclusive charmless final states such as $η' + X$ are found to be particularly important.

hep-ph↗
arXiv2005

The $b \to s$ penguin amplitude in charmless $B \to PP$ decays

The $b \to s$ penguin amplitude affects a number of $B$ meson decays to two pseudoscalar ($P$) mesons in which potential anomalies are being watched carefully, though none has yet reached a statistically compelling level. These include (a) a rate for $B^0 \to K^0 π^0$ which is slightly enhanced with respect to expectations; (b) a time-dependent CP asymmetry parameter $S$ for $B^0 \to K^0 π^0$ which is low in comparison with the expected value of $\sin 2 β\simeq 0.73$, and (c) a similar deviation in the parameter $S$ for $B^0 \to η' K_S$. These and related phenomena involving vector mesons in the final state are discussed in a unified way in and beyond the Standard Model. Future experiments which would conclusively indicate the presence of new physics are identified. Several of these involve decays of the strange $B$ meson $B_s$. In the Standard Model we note an approximate sum rule for CP rate differences in $B^0\to K^+π^-, B^+\to K^+π^0$ and $B^0\to K^0π^0$, predicting a negative sign for the latter asymmetry.

hep-ph↗
arXiv2004

Status of the CKM Matrix

The experimental status and theoretical uncertainties of the Cabibbo--Kobayashi--Maskawa (CKM) matrix describing the charge-changing weak transitions between quarks with charges -1/3 ($d, s, b$) and 2/3 ($u, c, t$) are reviewed. Some recent methods of obtaining phases of CKM elements are described.

hep-ph↗
arXiv2004

Angular distributions in $J/ψ(ρ,ω)$ states near threshold

A resonance X(3872), first observed in the decays $B \to K X$, has been seen to decay to $J/ψπ^+ π^-$. The $π^+ π^-$ mass spectrum peaks near its kinematic upper limit, prompting speculation that the dipion system may be in a $ρ^0$. The decay $X(3872) \to J/ψω$ also has been observed. The reaction $γγ\to J/ψπ^+ π^-$ has been studied. Consequently, angular distributions in decays of $J/ψ(ρ^0,ω)$ states near threshold are of interest, and results are presented.

hep-ph↗
arXiv2004

Status of $ψ''$ Decays to Charmless Final States

The non-$D \bar D$ decays of the $\ppp = ψ(3770)$ resonance are reviewed and possibilities for further measurements are noted. These decays can shed light on S--D mixing, the ``missing'' $ψ' = ψ(3686)$ decays, a possible discrepancy between the total and $D \bar D$ cross sections at the $\ppp$, and rescattering effects contributing to enhanced $b \to s$ penguin amplitudes in $B$ meson decays.

hep-ph↗
arXiv2004

Correlated bounds on CP asymmetries in $B^0 \to η' K_S$

Flavor SU(3) is used to constrain the coefficients of $\sinΔmt$ and $\cosΔmt$ in the time-dependent CP asymmetry of $B^0 \to η' K_S$. Correlated bounds in the $(S_{η' K}, C_{η' K})$ plane are derived, by using recent rate measurements of $B^0$ decays into $K^+ K^-, π^0π^0, π^0η, π^0η', ηη, ηη', η'η'$. Stringent bounds are obtained when assuming a single SU(3) singlet amplitude and when neglecting annihilation-type amplitudes.

hep-ph↗
arXiv2004

Vector meson pair production in two-photon collisions near threshold

The cross sections for several $γγ\to VV$ processes exhibit strong enhancements near threshold, where $V$ denotes a vector meson. The pattern of these enhancements is not well understood; for example, $γγ\to ρ^0 ρ^0$ shows an appreciable peak, while $γγ\to ρ^+ ρ^-$ does not. Some possible mechanisms for this behavior are discussed. Tests are proposed involving production of systems containing heavier quarks, e.g., through the reaction $γγ\to J/ψρ^0$. The importance of modeling $\ell^+ \ell^- π^+ π^-$ angular distributions in decays of threshold $J/ψρ^0$ enhancements is illustrated by comparing the expected distributions for S-wave decays of scalar particles and P-wave decays of pseudoscalar particles.

hep-ph↗
arXiv2004

Implications of CP Asymmetries in $B \to π^+ π^-$

CP asymmetries in $B^0(t)\to π^+ π^-$ are studied by relating this process in broken flavor SU(3) with $B^+\to K^0π^+$ and $B^0\to K^+π^-$. Using two different scenarios for SU(3) breaking, we show that the range of values of the weak phase $α$ permitted by the measured asymmetries overlaps with that obtained from other CKM constraints, supporting the KM origin of the asymmetries. We evaluate the potential precision of this method to improve the determination of $α$.

hep-ph↗
arXiv2004

Precision electroweak tests with $\bar ν_e e$ scattering

Measurements of the cross section for $\bar ν_e e^-$ elastic scattering with unprecedented precision have recently been proposed. The impact of these experiments for detecting possible deviations from the standard electroweak theory is analyzed and compared with that of several other measurements.

hep-ph↗
arXiv2004

Charmless $B \to PP$ decays using flavor SU(3) symmetry

The decays of $B$ mesons to a pair of charmless pseudoscalar ($P$) mesons are analyzed within a framework of flavor SU(3). Symmetry breaking is taken into account in tree ($T$) amplitudes through ratios of decay constants; exact SU(3) is assumed elsewhere. Acceptable fits to $B \to ππ$ and $B \to K π$ branching ratios and CP asymmetries are obtained with tree, color-suppressed ($C$), penguin ($P$), and electroweak penguin ($P_{EW}$) amplitudes. Crucial additional terms for describing processes involving $η$ and $η'$ include a large flavor-singlet penguin amplitude ($S$) as proposed earlier and a penguin amplitude $P_{tu}$ associated with intermediate $t$ and $u$ quarks. For the $B^+ \to π^+ η'$ mode a term $S_{tu}$ associated with intermediate $t$ and $u$ quarks also may be needed. Values of the weak phase $γ$ are obtained consistent with an earlier analysis of $B \to VP$ decays, where $V$ denotes a vector meson, and with other analyses of CKM parameters.

hep-ph↗
arXiv2004

Exotic states of matter in heavy meson decays

The potential of decays of mesons containing heavy quarks [including $B$ mesons and the $Υ(1S)$] for producing final states of matter with unusual quark configurations, such as $q q \bar q \bar q$ or $q q q q \bar q$, is investigated. The usefulness of antineutron detection in such searches is stressed.

hep-ph↗