skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Polarization states in B{yields}{rho}K* and new physics

Abstract

The standard model explanations of the anomalously-large transverse polarization fraction f{sub T} in B{yields}{phi}K* can be tested by measuring the polarizations of the two decays B{sup +}{yields}{rho}{sup +}K*{sup 0} and B{sup +}{yields}{rho}{sup 0}K*{sup +}. For the scenario in which the transverse polarizations of both B{yields}{rho}K* decays are predicted to be large, we derive a simple relation between the f{sub T}'s of these decays. If this relation is not confirmed experimentally, this would yield an unambiguous signal for new physics. The new-physics operators which can account for the discrepancy in B{yields}{pi}K decays will also contribute to the polarization states of B{yields}{rho}K*. We compute these contributions and show that there are only two operators which can simultaneously account for the present B{yields}{pi}K and B{yields}{rho}K* data. If the new physics obeys an approximate U-spin symmetry, the B{yields}{phi}K* measurements can also be explained.

Authors:
; ;  [1];  [2];  [3]
  1. Physique des Particules, Universite de Montreal, C.P. 6128, succ. centre-ville, Montreal, QC, H3C 3J7 (Canada)
  2. Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON, M5S 1A7 (Canada)
  3. Physics Department, McGill University, 3600 University St., Montreal, Quebec, H3A 2T8 (Canada)
Publication Date:
OSTI Identifier:
20713822
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 72; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.72.094008; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; K*-892 MESONS; PARTICLE DECAY; PHI-1020 MESONS; PIONS; POLARIZATION; RHO-770 MESONS; SPIN; STANDARD MODEL; SYMMETRY

Citation Formats

Baek, Seungwon, Hamel, Philippe, London, David, Datta, Alakabha, and Hernandez, Oscar F. Polarization states in B{yields}{rho}K* and new physics. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.094008.
Baek, Seungwon, Hamel, Philippe, London, David, Datta, Alakabha, & Hernandez, Oscar F. Polarization states in B{yields}{rho}K* and new physics. United States. doi:10.1103/PhysRevD.72.094008.
Baek, Seungwon, Hamel, Philippe, London, David, Datta, Alakabha, and Hernandez, Oscar F. Tue . "Polarization states in B{yields}{rho}K* and new physics". United States. doi:10.1103/PhysRevD.72.094008.
@article{osti_20713822,
title = {Polarization states in B{yields}{rho}K* and new physics},
author = {Baek, Seungwon and Hamel, Philippe and London, David and Datta, Alakabha and Hernandez, Oscar F.},
abstractNote = {The standard model explanations of the anomalously-large transverse polarization fraction f{sub T} in B{yields}{phi}K* can be tested by measuring the polarizations of the two decays B{sup +}{yields}{rho}{sup +}K*{sup 0} and B{sup +}{yields}{rho}{sup 0}K*{sup +}. For the scenario in which the transverse polarizations of both B{yields}{rho}K* decays are predicted to be large, we derive a simple relation between the f{sub T}'s of these decays. If this relation is not confirmed experimentally, this would yield an unambiguous signal for new physics. The new-physics operators which can account for the discrepancy in B{yields}{pi}K decays will also contribute to the polarization states of B{yields}{rho}K*. We compute these contributions and show that there are only two operators which can simultaneously account for the present B{yields}{pi}K and B{yields}{rho}K* data. If the new physics obeys an approximate U-spin symmetry, the B{yields}{phi}K* measurements can also be explained.},
doi = {10.1103/PhysRevD.72.094008},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 72,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}
  • The recent observations of sizable transverse fractions of B{yields}{phi}K* may hint for the existence of new physics. We analyze all possible new-physics four-quark operators and find that two classes of new-physics operators could offer resolutions to the B{yields}{phi}K* polarization anomaly. The operators in the first class have structures (1-{gamma}{sub 5})x(1-{gamma}{sub 5}), {sigma}(1-{gamma}{sub 5})x{sigma}(1-{gamma}{sub 5}), and in the second class (1+{gamma}{sub 5})x(1+{gamma}{sub 5}), {sigma}(1+{gamma}{sub 5})x{sigma}(1+{gamma}{sub 5}). For each class, the new-physics effects can be lumped into a single parameter. Two possible experimental results of polarization phases, arg(A{sub perpendicular})-arg(A{sub parallel}){approx_equal}{pi} or 0, originating from the phase ambiguity in data, could be separatelymore » accounted for by our two new-physics scenarios: the first (second) scenario with the first (second) class new-physics operators. The consistency between the data and our new-physics analysis suggests a small new-physics weak phase, together with a large(r) strong phase. We obtain sizable transverse fractions {lambda}{sub parallel{sub parallel}}+{lambda}{sub perpendicular{sub perpendicular}}{approx_equal}{lambda}{sub 00}, in accordance with the observations. We find {lambda}{sub parallel{sub parallel}}{approx_equal}0.8{lambda}{sub perpendicular{sub perpendicular}} in the first scenario but {lambda}{sub parallel{sub parallel}} > or approx. {lambda}{sub perpendicular{sub perpendicular}} in the second scenario. We discuss the impact of the new-physics weak phase on observations.« less
  • The B{yields}K*{rho}, K*{omega} decays are useful to determine the Cabbibo-Kobayashi-Maskawa (CKM) angle {phi}{sub 3}={gamma}. Their polarization fractions are also interesting because of the polarization puzzle of the B{yields}{phi}K* decay. We study these decays in the perturbative QCD approach based on k{sub T} factorization. After calculating the nonfactorizable and annihilation type contributions, in addition to the conventional factorizable contributions, we find that the contributions from the annihilation diagrams are crucial. They give dominant contribution to the strong phases and suppress the longitudinal polarizations. Our results agree with the current existing data. We also predict sizable direct CP asymmetries in B{sup +}{yields}K*{supmore » +}{rho}{sup 0}, B{sup 0}{yields}K*{sup +}{rho}{sup -}, and B{sup +}{yields}K*{sup +}{omega} decays, which can be tested by the oncoming measurements in the B factory experiments.« less
  • First observations of the B{sub s}{sup 0{yields}}D{sub s}*{sup -{pi}+}, B{sub s}{sup 0{yields}}D{sub s}{sup -{rho}+} and B{sub s}{sup 0{yields}}D{sub s}*{sup -{rho}+} decays are reported together with measurements of their branching fractions: B(B{sub s}{sup 0{yields}}D{sub s}*{sup -{pi}+})=[2.4{sub -0.4}{sup +0.5}(stat){+-}0.3(syst){+-} 0.4(f{sub s})]x10{sup -3}, B(B{sub s}{sup 0{yields}}D{sub s}{sup -{rho}+})=[8.5{sub -1.2}{sup +1.3}(stat){+-}1.1(syst){+-}1.3(f{sub s})]x10{sup -3} and B(B{sub s}{sup 0{yields}}D{sub s}*{sup -{rho}+})=[11.9{sub -2.0}{sup +2.2}(stat){+-}1.7(syst){+-}1.8(f{sub s})]x10{sup -3} (f{sub s}=N{sub B{sub s}{sup (*)}B{sub s}{sup (*)}/N{sub bb}}). From helicity-angle distributions, we measured the longitudinal polarization fraction in B{sub s}{sup 0{yields}}D{sub s}*{sup -{rho}+} decays to be f{sub L}(B{sub s}{sup 0{yields}}D{sub s}*{sup -{rho}+})=1.05{sub -0.10}{sup +0.08}(stat){sub -0.04}{sup +0.03}(syst). These results are based onmore » a 23.6 fb{sup -1} data sample collected at the {Upsilon}(5S) resonance with the Belle detector at the KEKB e{sup +}e{sup -} collider.« less
  • We measure the branching fraction (B), polarization (f{sub L}), and CP asymmetry (A{sub CP}) of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} decays and search for the decay B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980) based on a data sample of 231.8x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. In B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} decays we measure B=(16.8{+-}2.2{+-}2.3)x10{sup -6}, f{sub L}=0.905{+-}0.042{sub -0.027}{sup +0.023}, and A{sub CP}=-0.12{+-}0.13{+-}0.10, and find an upper limit on the branching fraction of B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980)({yields}{pi}{sup +}{pi}{sup -}) decays of 1.9x10{sup -6} at 90% confidence level.
  • We present the results of a study of the charmless vector-vector decay B{sup +}{yields}{rho}{sup +}K{sup *0}, based on 253 fb{sup -1} of data collected with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We obtain the branching fraction B(B{sup +}{yields}{rho}{sup +}K*{sup 0})=[8.9{+-}1.7(stat){+-}1.2(syst)]x10{sup -6}. We also perform a helicity analysis of the {rho} and K* vector mesons, and obtain the longitudinal polarization fraction f{sub L}(B{sup +}{yields}{rho}{sup +}K*{sup 0})=0.43{+-}0.11(stat){sub -0.02}{sup +0.05}(syst)