scholarly journals Addendum to “Implications of the new LHCb angular analysis of B→K*μ+μ− : Hadronic effects or new physics?”

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
T. Hurth ◽  
F. Mahmoudi ◽  
S. Neshatpour
Keyword(s):  
New Physics ◽  
Angular Analysis

scholarly journals The time-dependent angular analysis of Bd → KSℓℓ, a new benchmark for new physics

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Sébastien Descotes-Genon ◽  
Martín Novoa-Brunet ◽  
K. Keri Vos
Keyword(s):  
Time Evolution ◽  
Form Factors ◽  
New Physics ◽  
Time Dependent ◽  
Angular Analysis ◽  
Time Dependent Analysis ◽  
Tensor Operators

Abstract We consider the time-dependent analysis of Bd→ KSℓℓ taking into account the time-evolution of the Bd meson and its mixing into $$ {\overline{B}}_d $$ B ¯ d . We discuss the angular conventions required to define the angular observables in a transparent way with respect to CP conjugation. The inclusion of time evolution allows us to identify six new observables, out of which three could be accessed from a time-dependent tagged analysis. We also show that these observables could be obtained by time-integrated measurements in a hadronic environment if flavour tagging is available. We provide simple and precise predictions for these observables in the SM and in NP models with real contributions to SM and chirally flipped operators, which are independent of form factors and charm-loop contributions. As such, these observables provide robust and powerful cross-checks of the New Physics scenarios currently favoured by global fits to b → sℓℓ data. In addition, we discuss the sensitivity of these observables with respect to NP scenarios involving scalar and tensor operators, or CP-violating phases. We illustrate how these new observables can provide a benchmark to discriminate among the various NP scenarios in b → sμμ. We discuss the extension of these results for Bs decays into f0, η or η′.

scholarly journals Probing new physics via an angular analysis of B → V 1 V 2 decays

2004 ◽  
Vol 67 (4) ◽  
pp. 579-585 ◽  
Author(s):  
D London ◽  
N Sinha ◽  
R Sinha
Keyword(s):  
New Physics ◽  
Angular Analysis

scholarly journals STUDY OF CP VIOLATION IN $\Lambda_c^+$ DECAY

2011 ◽  
Vol 26 (15) ◽  
pp. 2523-2535 ◽  
Author(s):  
XIAN-WEI KANG ◽  
HAI-BO LI ◽  
GONG-RU LU ◽  
ALAKABHA DATTA
Keyword(s):  
Angular Distribution ◽  
Cp Violation ◽  
Vector Meson ◽  
Higgs Doublet ◽  
New Physics ◽  
Angular Analysis ◽  
The Standard Model ◽  
Helicity Amplitudes ◽  
Doublet Model ◽  
Two Higgs Doublet Model

In this paper, we study CP violation in [Formula: see text] and [Formula: see text] decays, where B, P and V denote a light spin-½ baryon, pseudoscalar and a vector meson respectively. In these processes the T odd CP violating triple-product (TP) correlations are examined. The genuine CP violating observables which are composed of the helicity amplitudes occurring in the angular distribution are constructed. Experimentally, by performing a full angular analysis it is shown how one may extract the helicity amplitudes and then obtain the TP asymmetries. We estimate the TP asymmetries in [Formula: see text] decays to be negligible in the Standard Model making these processes an excellent place to look for new physics. Taking a two-Higgs doublet model, as an example of new physics, we show that large TP asymmetries are possible in these decays. Finally, we discuss how BES-III and super τ-charm experiments will be sensitive to these CP violating signals in [Formula: see text] decays.

scholarly journals TRIPLE-PRODUCT CORRELATIONS IN B→V1V2 DECAYS AND NEW PHYSICS

2004 ◽  
Vol 19 (15) ◽  
pp. 2505-2544 ◽  
Author(s):  
ALAKABHA DATTA ◽  
DAVID LONDON
Keyword(s):  
State Vector ◽  
New Physics ◽  
Triple Product ◽  
Beyond The Standard Model ◽  
B Decays ◽  
Final State ◽  
Angular Analysis ◽  
The Standard Model ◽  
The Right ◽  
B Quark

In this paper we examine T-violating triple-product correlations (TP's) in B→V1V2 decays. TP's are excellent probes of physics beyond the standard model (SM) for two reasons: (i) within the SM, most TP's are expected to be tiny, and (ii) unlike direct CP asymmetries, TP's are not suppressed by the small strong phases which are expected in B decays. TP's are obtained via the angular analysis of B→V1V2. In a general analysis based on factorization, we demonstrate that the most promising decays for measuring TP's in the SM involve excited final-state vector mesons, and we provide estimates of such TP's. We find that there are only a handful of decays in which large TP's are possible, and the size of these TP's depends strongly on the size of nonfactorizable effects. We show that TP's which vanish in the SM can be very large in models with new physics. The measurement of a nonzero TP asymmetry in a decay where none is expected would specifically point to new physics involving large couplings to the right-handed b-quark.

scholarly journals REDUCING PENGUIN POLLUTION

2013 ◽  
Vol 28 (15) ◽  
pp. 1350063 ◽  
Author(s):  
BHUBANJYOTI BHATTACHARYA ◽  
ALAKABHA DATTA ◽  
DAVID LONDON
Keyword(s):  
Standard Model ◽  
New Physics ◽  
Electroweak Penguin ◽  
Theoretical Error ◽  
Angular Analysis ◽  
The Standard Model ◽  
Tree Diagram ◽  
Experimental Errors ◽  
Exact Size

The most common decay used for measuring 2βs, the phase of [Formula: see text] mixing, is [Formula: see text]. This decay is dominated by the color-suppressed tree diagram, but there are other contributions due to gluonic and electroweak penguin diagrams. These are often referred to as "penguin pollution" (PP) because their inclusion in the amplitude leads to a theoretical error in the extraction of 2βsfrom the data. In the standard model (SM), it is estimated that the PP is negligible, but there is some uncertainty as to its exact size. Now, [Formula: see text] (the measured value of 2βs) is small, in agreement with the SM, but still has significant experimental errors. When these are reduced, if one hopes to be able to see clear evidence of new physics (NP), it is crucial to have the theoretical error under control. In this paper, we show that, using a modification of the angular analysis currently used to measure [Formula: see text] in [Formula: see text], one can reduce the theoretical error due to PP. Theoretical input is still required, but it is much more modest than entirely neglecting the PP. If [Formula: see text] differs from the SM prediction, this points to NP in the mixing. There is also enough information to test for NP in the decay. This method can be applied to all [Formula: see text] decays.

scholarly journals Angular analysis of new physics operators in polarized τ →3ℓ decays

2015 ◽  
Vol 2015 (10) ◽  
Author(s):  
Robin Brüser ◽  
Thorsten Feldmann ◽  
Björn O. Lange ◽  
Thomas Mannel ◽  
Sascha Turczyk
Keyword(s):  
New Physics ◽  
Angular Analysis

scholarly journals Phenomenology of inclusive $$ \overline{B}\to {X}_s{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ for the Belle II era

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Tobias Huber ◽  
Tobias Hurth ◽  
Jack Jenkins ◽  
Enrico Lunghi ◽  
Qin Qin ◽  
...  
Keyword(s):  
Phenomenological Study ◽  
Decay Channel ◽  
New Physics ◽  
Independent Manner ◽  
New Era ◽  
Angular Analysis ◽  
Quark Flavour ◽  
Belle Ii ◽  
The Many ◽  
Inclusive Decay

Abstract With the first data being recorded at Belle II, we are at the brink of a new era in quark flavour physics. The many exciting new opportunities for Belle II include a full angular analysis of inclusive $$ \overline{B}\to {X}_s{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ B ¯ → X s ℓ + ℓ − which has the potential to reveal new physics, in particular by its interplay with the exclusive b → sℓ+ℓ− counterparts studied extensively at LHCb. In this paper, we present fully updated Standard Model predictions for all angular observables necessary for this endeavour. These predictions are tailored to Belle II and include an elaborate study of the treatment of collinear photons which become crucial when aiming for the highest precision. In addition, we present a phenomenological study of the potential for Belle II to reveal possible new physics in the inclusive decay channel, both in an independent manner and in combination with exclusive modes.

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