Precision Tests of Flavor and CP violation in B Decays

Isospin and flavor SU(3) set stringent bounds on penguin pollution in $B^0(t)\to \rho^+\rho^-$, providing a theoretically precise determination of $\alpha\equiv \phi_2$, $\alpha = (91\pm 7_{\rm exp}\pm 3_{\rm th})^\circ$. Isospin breaking in a sum rule for $B\to K\pi$ rates is shown to be suppressed. A similar sum rule holds for CP asymmetries in $B\to K\pi$. Violation of these sum rules would be evidence for an anomalous $\Delta I=1$ piece in ${\cal H}_{\rm eff}$.Comment: Reference added; Invited talk presented at the First Workshop on Theory, Phenomenology and Experiments in Heavy Flavor Physics, Anacapri, Italy, 29-31 200

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 $B\to K\pi$ decays, where isospin breaking is shown to be negligible. (2) An SU(3) sum rule for pairs of $B\to K\pi$ and $B\to K\eta_8$, generalized to pairs of $B\to K\pi, B\to K\eta$ and $B\to K\eta'$.Comment: 11 pages, small corrections, one reference added, submitted to Physics Letters

Understanding the nature of Ds(2317)D_s(2317) and Ds(2460)D_s(2460) through nonleptonic B Decays

We consider the nonleptonic B decays $B \to D^{(*)} D_s(2317)$ and $B \to D^{(*)} D_s(2460)$, involving the newly discovered $D_s(2317)$ and the $D_s(2460)$ states. We find that experiments indicate disagreement with model calculations of their properties and/or breakdown of the factorization assumption for these decays . We point out that decays involving $B_s$ mesons where the $D_s$ resonances can be produced via the weak decay of the $b$ quark can provide further information about the nature of these newly discovered states. We also propose a model to calculate the two body nonleptonic decays $B \to D^{(*)} D_s(2317)(D_s(2460))$, if the $D_s(2317)$ and $D_s(2460)$ are interpreted as $DK$ and $D^*K$ molecules.Comment: 14 pages LaTeX; additional reference, notational corrections and minor clarifications of tex

Ursinus College Alumni Journal, Winter 1946

Dean • President\u27s page • Record enrollment in 76th year • Necrology • Dean Kline dies in 83rd year • Livingood honored • Dr. Niblo attends Episcopal convention • Music room developed • Faculty increased • Revue of sports • Seeders appointed head basketball coach • Student activities • Letters to the alumni • Old Timers\u27 Day • Alumni committees appointed • Re-education of Germany • News about ourselves • Dr. Haines: Teacher and author • News around town • Recipient of Rotary Club award • Dr. Markley completes term of service • 1946 and football • As the placement office sees us • Men\u27s basketball schedulehttps://digitalcommons.ursinus.edu/alumnijournal/1026/thumbnail.jp

Ursinus College Alumni Journal, Summer 1947

Word of appreciation • Old Timers\u27 Day • President\u27s page • Alumni Association tables special committee\u27s report • Student union chosen as war memorial • Women\u27s Club • Dr. Clawson new Ursinus Dean • Board of Directors creates new committee, adds five members • Campus to be used for astronomical observation • Kuhrt Wieneke named coach of football • Three resign from faculty • Fourteen members added to faculty • Dr. Distler addresses graduating class • Sports: Men\u27s basketball; baseball; men\u27s tennis; track; women\u27s swimming; women\u27s basketball; women\u27s tennis • Local alumni associations meet • Work progressing on alumni register • Summer assembly • News about ourselves • Necrology • News around townhttps://digitalcommons.ursinus.edu/alumnijournal/1031/thumbnail.jp

Merida virus, a putative novel rhabdovirus discovered in Culex and Ochlerotatus spp. mosquitoes in the Yucatan Peninsula of Mexico.

Sequences corresponding to a putative, novel rhabdovirus [designated Merida virus (MERDV)] were initially detected in a pool of Culex quinquefasciatus collected in the Yucatan Peninsula of Mexico. The entire genome was sequenced, revealing 11 798 nt and five major ORFs, which encode the nucleoprotein (N), phosphoprotein (P), matrix protein (M), glycoprotein (G) and RNA-dependent RNA polymerase (L). The deduced amino acid sequences of the N, G and L proteins have no more than 24, 38 and 43 % identity, respectively, to the corresponding sequences of all other known rhabdoviruses, whereas those of the P and M proteins have no significant identity with any sequences in GenBank and their identity is only suggested based on their genome position. Using specific reverse transcription-PCR assays established from the genome sequence, 27 571 C. quinquefasciatus which had been sorted in 728 pools were screened to assess the prevalence of MERDV in nature and 25 pools were found positive. The minimal infection rate (calculated as the number of positive mosquito pools per 1000 mosquitoes tested) was 0.9, and similar for both females and males. Screening another 140 pools of 5484 mosquitoes belonging to four other genera identified positive pools of Ochlerotatus spp. mosquitoes, indicating that the host range is not restricted to C. quinquefasciatus. Attempts to isolate MERDV in C6/36 and Vero cells were unsuccessful. In summary, we provide evidence that a previously undescribed rhabdovirus occurs in mosquitoes in Mexico.The authors thank Valeria Bussetti for expert technical assistance. This study was supported by the National Institutes of Health (awards 5R21AI067281, AI057158, 5R21AI067281 and AI088647), the United States Department of Defense and an intramural grant from Iowa State University. AEF is supported by a grant from the Wellcome Trust (award 106207).This is the final version of the article. It first appeared from the Microbiology Society via http://dx.doi.org/10.1099/jgv.0.00042

Merida virus, a putative novel rhabdovirus discovered in Culex and Ochlerotatus spp. mosquitoes in the Yucatan Peninsula of Mexico

Sequences corresponding to a putative, novel rhabdovirus [designated Merida virus (MERDV)] were initially detected in a pool of Culex quinquefasciatus collected in the Yucatan Peninsula of Mexico. The entire genome was sequenced, revealing 11 798 nt and five major ORFs, which encode the nucleoprotein (N), phosphoprotein (P), matrix protein (M), glycoprotein (G) and RNA-dependent RNA polymerase (L). The deduced amino acid sequences of the N, G and L proteins have no more than 24, 38 and 43 % identity, respectively, to the corresponding sequences of all other known rhabdoviruses, whereas those of the P and M proteins have no significant identity with any sequences in GenBank and their identity is only suggested based on their genome position. Using specific reverse transcription-PCR assays established from the genome sequence, 27 571 C. quinquefasciatus which had been sorted in 728 pools were screened to assess the prevalence of MERDV in nature and 25 pools were found positive. The minimal infection rate (calculated as the number of positive mosquito pools per 1000 mosquitoes tested) was 0.9, and similar for both females and males. Screening another 140 pools of 5484 mosquitoes belonging to four other genera identified positive pools of Ochlerotatus spp. mosquitoes, indicating that the host range is not restricted to C. quinquefasciatus. Attempts to isolate MERDV in C6/36 and Vero cells were unsuccessful. In summary, we provide evidence that a previously undescribed rhabdovirus occurs in mosquitoes in Mexico.The authors thank Valeria Bussetti for expert technical assistance. This study was supported by the National Institutes of Health (awards 5R21AI067281, AI057158, 5R21AI067281 and AI088647), the United States Department of Defense and an intramural grant from Iowa State University. AEF is supported by a grant from the Wellcome Trust (award 106207).This is the final version of the article. It first appeared from the Microbiology Society via http://dx.doi.org/10.1099/jgv.0.00042

Diagnostic for new physics in B→πKB \to \pi K decays

A recent analysis of $B \to \pi K$ decays concludes that present data do not clearly indicate whether (i) the standard model (or $\Delta I=0$ new physics) is sufficient, or (ii) $\Delta I=1$ new physics is needed. We show that these two possibilities can be distinguished by whether a sum rule relating the CP asymmetries of the four $B \to \pi K$ decays is valid. If case (i) is favored, the sum rule holds, and one predicts $A_{CP}(\pi^0 K^0) = -0.15$, while in case (ii) fits to new physics involving large values of a color-suppressed tree amplitude entail $A_{CP}(\pi^0 K^0) = -0.03$. The current experimental average $A_{CP}(\pi^0 K^0) = -0.01 \pm 0.10$ must be measured a factor of at least three times more precisely in order to distinguish between the two cases.Comment: 10 pages, no figures. Submitted to Physics Letters B. Slight clarification adde