High Energy Physics - Phenomenology · arXiv:1105.0970 v2 · submitted 5 May 2011
Reconciling anomalous measurements in Bs−B̄s mixing: the role of CPT-conserving and CPT-violating new physics
The paper says
“The NP absorptive contribution to $\bsbsbar$ mixing therefore seems to be essential, and would imply a large branching fraction for channels like Bs → τ+τ−.”
from the abstract · picked out as the main claim by a classifier
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Abstract
Recently observed anomalies in the Bs → J/ψφ decay and the like-sign dimuon asymmetry Absl hint at possible new physics (NP) in the $\bsbsbar$ mixing. We parameterize the NP with four model-independent quantities: the magnitudes and phases of the dispersive part M12 and the absorptive part Γ12 of the NP contribution to the effective Hamiltonian. We constrain these parameters using the four observables ΔMs, ΔΓs, the mixing phase βsJ/ψφ, and Absl. Our quantitative fit indicates that the NP should contribute a significant dispersive as well as absorptive part. In fact, models that do not contribute a new absorptive part are disfavored at more than 99% confidence level. We extend this formalism to include CPT violation, and show that CPT violation by itself, or even in presence of CPT-conserving new physics without an absorptive part, helps only marginally in the simultaneous resolution of these anomalies. The NP absorptive contribution to $\bsbsbar$ mixing therefore seems to be essential, and would imply a large branching fraction for channels like Bs → τ+τ−.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: hedged possibility 0.88
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.46 · human participants 0.01 · controlled comparison 0.15 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.29 · mentions code or data availability 0.01
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| Recently observed anomalies in the $B_s \to J/\psi \phi$ decay and the like-sign dimuon asymmetry $A^b_{sl}$ hint at possible new physics (NP) in the $\bsbsbar$ mixing. | background 1.00 | 0.06 | 0.03 | hedged possibility 1.00 |
| We parameterize the NP with four model-independent quantities: the magnitudes and phases of the dispersive part $M_{12}$ and the absorptive part $\Gamma_{12}$ of the NP contribution to the effective Hamiltonian. | method 0.94 | 0.91 | 0.03 | asserted 0.98 |
| We constrain these parameters using the four observables $\Delta M_s$, $\Delta\Gamma_s$, the mixing phase $\beta_s^{J/\psi\phi}$, and $A^b_{sl}$. | method 0.99 | 0.87 | 0.03 | asserted 0.99 |
| Our quantitative fit indicates that the NP should contribute a significant dispersive as well as absorptive part. | result 0.99 | 0.95 | 0.28 | hedged possibility 0.91 |
| In fact, models that do not contribute a new absorptive part are disfavored at more than 99% confidence level. | result 0.97 | 0.90 | 0.23 | asserted 1.00 |
| We extend this formalism to include CPT violation, and show that CPT violation by itself, or even in presence of CPT-conserving new physics without an absorptive part, helps only marginally in the simultaneous resolution of these anomalies. | result 0.80 | 0.92 | 0.20 | asserted 0.99 |
| The NP absorptive contribution to $\bsbsbar$ mixing therefore seems to be essential, and would imply a large branching fraction for channels like $B_s \to \tau^+ \tau^-$. | interpretation 0.99 | 0.84 | 0.77 | hedged possibility 0.88 |
What kind of paper the classifier reports this is: theoretical result 0.96 · evidence from analysis of existing data 0.95
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- arXiv listing abstract v2
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- C citations
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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,861 input tokens, $0.0002 reported.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 2 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Explaining the $B \to K^\ast \mu^+ \mu^-$ data with scalar interactions hep-ph · Oct 2013
- New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators hep-ph · Sep 2011
How the literature uses it
5 arXiv papers cite this in 10 sentences
Papers citing it · 6 sentences without a confident label
Contests it 1 paper
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In contrast, a strong enhancement of $ΔΓ_s$ is not possible.[In [ref] significant violations of $ΔΓ_s ≤(ΔΓ_s)_SM$ were reported.
New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators · New-Physics Models · contest 0.86
Compares with it 1 paper
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It has $χ^2/dofs = 3.1/2$ corresponding to $1.3 σ$,[This result agrees well with the global analysis performed in [ref] , but disagrees with the work [ref] , which claims that the scenario S1 is disfavored by more than $3 σ$.] which is in almost equal parts due to $ΔΓ_s$ and $a_fs^s$.
New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators · Introduction · 0.97
Cites it as background 2 papers
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The resulting picture has shown a very good overall agreement of all the constraints, apart from some discrepancies (direct CP asymmetries difference between $B^- →K^- π^0$ and $B̅^0 →K^- π^+$, $B→τν$ versus $sin2β$, $B_s$ meson mixing from $J/Ψϕ$ channel, and the dimuon asymmetry), which are still under experimental scrutiny but may be understood in terms of New Physics contributions [ref] .
Exploring New Physics in the C7-C7' plane · Introduction · 0.81
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On the theoretical side also various NP explanations of these deviations have been suggested [ref] .
Explaining the $B \to K^\ast \mu^+ \mu^-$ data with scalar interactions · Introduction · 0.93
What it cites · 23 sentences without a confident label
Uses the method or tool of 2 papers
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The effective value of the former may be obtained in the presence of CPT violation by considering the decay rates of $B_s$ and $B_s$ to a final CP eigenstate $f_CP$ as [ref] : Γ(B_s(t) →f_CP) = |A_f|^2 [ |f_+(t)|^2 + |ξ_f_1|^2 |f_-(t)|^2 + space 2 Re( ξ_f_1 f_-(t) f_+^*(t)) ] , Γ(B_s(t) →f_CP) = |A_f/η_2|^2 [ |f_-(t)|^2 + |ξ_f_2|^2 |f_+(t)|^2 + space 2 Re( ξ_f_2 f_+(t) f_-^*(t)) ] ,
Probing CPT Violation in B Systems · CPT Violation: the formalism · 0.95
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With the transversity angle distribution [ref] , the time-dependent decay rate to the CP-even state is given by the coefficient of $(1+cos^2 θ)$, while the time-dependent decay rate to the CP-odd state is given by the coefficient of $sin^2θ$.
Angular distributions and lifetime differences in $B_s \to J/\psi \phi$ decays · CPT Violation: the formalism · 0.98
Uses data or values from 3 papers
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(ii) The like-sign dimuon asymmetry $A^b_sl$ in the combined $B$ data at DØ [ref] is almost $4σ$ away from the SM expectation.
Evidence for an anomalous like-sign dimuon charge asymmetry · Introduction · 0.86
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In addition, though the difference $ΔΓ_s$ between the decay widths of the mass eigenstates measured in this decay is consistent with the SM, it allows $ΔΓ_s$ values that are almost twice the SM prediction, and also opposite in sign [ref] .
Averages of b-hadron, c-hadron, and tau-lepton Properties · Introduction · 0.87
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In the SM, we have $ϕ_s(SM) = 0.0041 ±0.0007$ [ref] .
Numerical updates of lifetimes and mixing parameters of B mesons · The measurements · 0.98
Cites as background 14 papers
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The resolutions of the above anomalies, separately or simultaneously, have been discussed in the context of specific NP models: a scalar leptoquark model [ref] , models with an extra flavor-changing neutral gauge boson $Z'$ or R-parity violating supersymmetry [ref] , two-Higgs doublet model [ref] , models with a fourth generation of fermions [ref] , supersymmetric grand unified models [ref] , supersymmetric models with split sfermion generations [ref] or models with a very light spin-1 particle [ref] .
Possibility of large lifetime differences in neutral B meson systems · Introduction · 0.99
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The resolutions of the above anomalies, separately or simultaneously, have been discussed in the context of specific NP models: a scalar leptoquark model [ref] , models with an extra flavor-changing neutral gauge boson $Z'$ or R-parity violating supersymmetry [ref] , two-Higgs doublet model [ref] , models with a fourth generation of fermions [ref] , supersymmetric grand unified models [ref] , supersymmetric models with split sfermion generations [ref] or models with a very light spin-1 particle [ref] .
Enhanced $B_s$--$\bar{B}_s$ lifetime difference and anomalous like-sign dimuon charge asymmetry from new physics in $B_s \to \tau^+ \tau^-$ · Introduction · 0.99
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The resolutions of the above anomalies, separately or simultaneously, have been discussed in the context of specific NP models: a scalar leptoquark model [ref] , models with an extra flavor-changing neutral gauge boson $Z'$ or R-parity violating supersymmetry [ref] , two-Higgs doublet model [ref] , models with a fourth generation of fermions [ref] , supersymmetric grand unified models [ref] , supersymmetric models with split sfermion generations [ref] or models with a very light spin-1 particle [ref] .
CP violation in B_s mixing from heavy Higgs exchange · Introduction · 0.99
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