REVIEW
Measurement of Time-Dependent CP Asymmetry in B0->ccbar K(*)0 Decays
High Energy Physics - Experiment · Submitted 10 Feb 2009 · 19 references
Pith's verdict: A careful, statistics-limited update of sin2β from BABAR; the assumptions are stated, the systematics are broken out honestly, and the number is trustworthy.
T0 · AI review
Why Pith says this
Highlight any text to comment on it.
Referee report
The paper
The paper claims
BABAR reports sin(2 beta) = 0.687 +/- 0.028 (stat) +/- 0.012 (syst) and C_f = 0.024 +/- 0.020 (stat) +/- 0.016 (syst) from B0 -> charmonium K(*)0 decays, consistent with Standard Model CP violation.
The reading
Extended reading notes
Core claim
The combined fit to J/psi K_S, J/psi K_L, psi(2S) K_S, chi_c1 K_S, eta_c K_S, and J/psi K*0 yields -eta_f S_f = 0.687 +/- 0.028 (stat) +/- 0.012 (syst) and C_f = 0.024 +/- 0.020 (stat) +/- 0.016 (syst), with sin(2 beta) = 0.687 +/- 0.028 under the Standard Model assumption C_f = 0.
Load-bearing premise
The extraction of sin(2 beta) from S_f assumes that direct CP violation and CP violation in B0-B0bar mixing are negligible in b -> c cbar s decays, so that C_f = 0 and lambda_f = eta_f exp(-2 i beta). This is stated in Section I and is not tested by the fit. The measured C_f is consistent with zero, but its uncertainty is 0.020 (stat) and 0.016 (syst), so a nonzero C_f would shift the interpretation of S_f as sin(2 beta).
Original abstract
We present updated measurements of time-dependent CP asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of (465+/-5) million Upsilon(4S)->BBbar decays collected with the Babar detector at the PEPII asymmetric energy e+e- storage rings operating at the SLAC National Accelerator Laboratory. The time-dependent CP asymmetry parameters measured from JpsiKs, JpsiKL, Psi(2S)Ks, Chi_c1Ks, eta_cKs and JpsiK*0 decays are: C_f = 0.024+/-0.020(stat)+/-0.016(syst) and -\eta_f S_f = 0.687+/-0.028(stat)+/-0.012(syst).
The compiled record
The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
The abstract, sentence by sentence
We present updated measurements of time-dependent CP asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of (465+/-5) million Upsilon(4S)->BBbar decays collected with the Babar detector at the PEPII asymmetric energy e+e- storage rings operating at the SLAC National Accelerator Laboratory. The time-dependent CP asymmetry parameters measured from JpsiKs, JpsiKL, Psi(2S)Ks, Chi_c1Ks, eta_cKs and JpsiK*0 decays are: C_f = 0.024+/-0.020(stat)+/-0.016(syst) and -\eta_f S_f = 0.687+/-0.028(stat)+/-0.012(syst).
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present updated measurements of time-dependent CP asymmetries in fully reconstructed neutral B decays containing a charmonium meson. | contribution 1.00 | 0.95 | 0.21 | asserted 0.99 |
| s1 | The measurements reported here use a data sample of (465+/-5) million Upsilon(4S)->BBbar decays collected with the Babar detector at the PEPII asymmetric energy e+e- storage rings operating at the SLAC National Accelerator Laboratory. | method 1.00 | 0.64 | 0.03 | asserted 0.99 |
| s2 | The time-dependent CP asymmetry parameters measured from JpsiKs, JpsiKL, Psi(2S)Ks, Chi_c1Ks, eta_cKs and JpsiK*0 decays are: C_f = 0.024+/-0.020(stat)+/-0.016(syst) and -\eta_f S_f = 0.687+/-0.028(stat)+/-0.012(syst). | result 1.00 | 0.97 | 0.80 | asserted 1.00 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
Figures
Figures reproduced from arXiv:0902.1708 by the authors.
References
How later papers used it
47 later papers cite it
2 later papers by other authors are listed below: 1 used its method or tool and 1 used its data or values. 2 more papers by the same authors are listed: 2 used its method or tool.
Uses its method or tool 3 of 4 papers with this label · 2 by the same authors
-
Used the output of another BDT for flavor tagging, distinguishing from decays using inclusive properties of the other meson, as a variable in its own BDT.
Evidence for $CP$ violation in $B^{+} \to K^{*}(892)^{+} \pi^{0}$ from a Dalitz plot analysis of $B^{+} \to K^{0}_{\rm S} \pi^{+} \pi^{0}$ decays (2015) · 0.93 · paraphrased: the licence does not allow quoting
By the same authors
-
Used the output of a neural network for flavor tagging, distinguishing from decays using inclusive properties of the other meson, as a variable in its own neural network.
Observation of the rare decay B+->K+pi0pi0 and measurement of the quasi-two body contributions B+->K*(892)+pi0, B+->f0(980)K+ and B+->chic0K+ (2011) (same authors) · 0.93 · paraphrased: the licence does not allow quoting
-
Used the output of a neural network for flavour tagging, distinguishing from decays using inclusive properties of the other meson, as a variable in its own neural network.
Observation of the Rare Decay B+ -> K+ pi0 pi0 (2010) (same authors) · 0.92 · paraphrased: the licence does not allow quoting
Uses its data or values 1 of 17 papers with this label
-
Used the results of this paper together with an equation to obtain a bound at 2 sigma.
Subtleties in the BaBar measurement of time-reversal violation (2013) · 1.00 · paraphrased: the licence does not allow quoting
How the literature uses it
43 arXiv papers cite this in 51 sentences
Papers whose main result relates to this one's
States the same result 1 paper
-
The time-dependent CP asymmetry parameters measured from $J/\psi K_S^0$, $J/\psi K_L^0$, $\psi(2S) K_S^0$, $\chi_{c1} K_S^0$, $\eta_c K_S^0$, and $J/\psi K^{*0}$ decays are \begin{eqnarray} C_f &=& 0.026 \pm 0.020(stat) \pm 0.016(syst), S_f &=& 0.691 \pm 0.029(stat) \pm 0.014(syst). \end{eqnarray}
Update of Time-Dependent CP Asymmetry Measurements in $b$-->$c\bar{c}s$ Decays · 0.98
Papers citing it · 23 sentences without a confident label
Uses its method or tool 4 papers
-
The other pairings of reference and transformed transitions can be found in Refs. [ref] [ref] .] The standard flavour tagging techniques developed for the violation discovery measurement are used in order to select and mesons, and the selection of even and odd filter basis pairs, for $b→ccs$ transitions differ by a vs a in the final state (see for example [ref] ).
Symmetry violations at BaBar · Other symmetry tests in meson decay · 0.83
-
The three other variables entering the BDT are the absolute value of the cosine of the angle between the direction and the collision axis, the zeroth-order momentum-weighted Legendre polynomial moment, and the absolute value of the output of another BDT used for “flavor tagging”, , for distinguishing from decays using inclusive properties of the decay of the other meson in the $→$ event [ref] .
Evidence for $CP$ violation in $B^{+} \to K^{*}(892)^{+} \pi^{0}$ from a Dalitz plot analysis of $B^{+} \to K^{0}_{\rm S} \pi^{+} \pi^{0}$ decays · Event selection · 0.93
-
The three other variables entering the neural network are the absolute value of the cosine of the angle between the direction and the beam axis, the absolute value of the cosine of the angle between the thrust axis and the beam axis, and the absolute value of the output of a neural network used for “flavor tagging”, , for distinguishing from decays using inclusive properties of the decay of the other meson in the $→$ event [ref] .
Observation of the rare decay B+->K+pi0pi0 and measurement of the quasi-two body contributions B+->K*(892)+pi0, B+->f0(980)K+ and B+->chic0K+ · Event reconstruction and selection · 0.93
Uses its data or values 16 papers
-
Using the results of [ref] and Eq. [ref] we get, at $2σ$, [equation]
Subtleties in the BaBar measurement of time-reversal violation · Relevant data · 1.00
-
In our $B$ decay to $J/ΨK$, the CP-odd final state of [ref] can be approximated by [equation] and CP-even final state of [ref] can be approximated by [equation] where $Δm_B=0.463$ps$^-1$ is fixed [ref] , which are shown in Fig.[ref].
Cartan's Supersymmetry and the violation of CP symmetry · Cartan's supersymmetry and weak interactions · 0.92
-
The factories were optimised for this measurement [ref] and determined [ref] $sin2β^B-fact = 0.682 ±0.019$, which is the most precise constraint on the UT (Figure [ref]).
The CKM Parameters · INDIVIDUAL CONSTRAINTS · 0.99
Compares with it 4 papers
-
The measured values are in agreement with previous measurements performed at the factories [ref] and with the world averages [ref] .
Measurement of the time-dependent CP asymmetry in B0 -> J/{\psi} KS0 decays · Conclusion · 0.99
-
The combined value is $sin(2β)=0.760±0.034$, the precision of which is already comparable to that of the result $sin(2β)=0.09±0.03 ±0.01$ [ref] and the Belle result $sin(2β)=0.67±0.02 ±0.01$ [ref] .
Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review · CKM angle TEXT · 0.99
-
Furthermore, the result has a similar precision to, and is in good agreement with, previous measurements performed at the Belle and BaBar experiments at the KEKB and PEP-II colliders [ref] .
Measurement of $CP$ violation in $B^0 \rightarrow J/\psi K^0_S$ decays · Introduction · 1.00
Cites it as background 4 papers
-
In the standard model, $CP$ symmetry violation occurs from the interference of the tree diagram amplitude and the penguin diagram amplitude [ref] .
Cartan's Supersymmetry and the violation of CP symmetry · Introduction · 0.82
-
Although $CP$-violation involving $B$-mesons has been clearly established experimentally [ref] , and existing results are in good agreement with Standard Model predictions, additional and improved measurements are required to overconstrain the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix [ref] and probe for the effects of non-Standard Model physics.
Determination of the D0 -> K-pi+pi0 and D0 -> K-pi+pi+pi- Coherence Factors and Average Strong-Phase Differences Using Quantum-Correlated Measurements · Introduction · 0.86
-
The observation of mixing-induced violation in decays [ref] , as well as in the charmless penguin-diagram dominated $K^0$ decays [ref] , and of direct violation both in the neutral kaon system [ref] and in $B^0K^+π^-$ decays [ref] , are in agreement with predictions of the standard model (SM) of electroweak interactions [ref] .
Search for B^0 Meson Decays to \pi^0 K^0_SK^0_S, \eta K^0_S K^0_S, and \eta^{\prime}K^0_SK^0_S · Introduction · 0.91
Discussion
Disagree with the review, or know something it missed? Leave a comment, highlight any passage above to comment on it, or challenge this review formally.