Suman Kumbhakar

activity

20172022

R_{D}

and

R_{D^{*}}

94 citations · 252 across the 16 of their papers we have counts for

collaborators

16 papers

hep-ph2022★ 19 cited

A U-spin Puzzle in $B$ Decays

Bhubanjyoti Bhattacharya, Suman Kumbhakar, David London +1

We impose U spin symmetry ( $S U (2)_{Uspin}$ ) on the Hamiltonian for $B$ decays. As expected, we find the equality of amplitudes related by the exchange $d \leftrightarrow s$ . We…

hep-ph2022★ 3 cited

Lepton Flavor Violating $B \to K_{2}^{*} (1430) μ^{\pm} τ^{\mp}$ Decays

Suman Kumbhakar, Ria Sain, Juhi Vardani

A number of measurements in decays induced by the semileptonic $b \to s$ and $b \to c$ transitions hint towards a possible role of new physics in both sectors. Motivated by these ano…

hep-ph2020★ 3 cited

New physics in $b \to s e^{+} e^{-}$ : A model independent analysis

Ashutosh Kumar Alok, Suman Kumbhakar, Jyoti Saini +1

The lepton universality violating flavor ratios $R_{K} / R_{K^{*}}$ indicate new physics either in $b \to s μ^{+} μ^{-}$ or in $b \to s e^{+} e^{-}$ or in both. If the new physics is only $b \to…

hep-ph2020★ 5 cited

Investigating the effect of $U_{1}$ vector leptoquark on $b \to uτ ν ˉ$ mediated $B$ decays

Suman Kumbhakar, Rukmani Mohanta

The recent measurements of lepton flavor university (LFU) violating observables in semileptonic $b \to c ℓ ν ˉ$ and $b \to s ℓ^{+} ℓ^{-}$ transitions by various experiments e…

hep-ph2020★ 14 cited

Signatures of complex new physics in $b \to c τ ν ˉ$ transitions

Suman Kumbhakar

The anomalies in the measurements of $R_{D}$ and $R_{D^{*}}$ continue to provide motivation for physics beyond the Standard Model. In this work, we assume the new physics Wilson coeffi…

hep-ph2020★ 1 cited

New Physics solutions for $b \to c τ ν ˉ$ anomalies after Moriond 2019

Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar +1

At Moriond 2019, Belle collaboration has announced new measurements on the flavour ratios $R_{D} - R_{D^{*}}$ which are consistent with their Standard Model predictions within $1.2 σ$ .…

hep-ph2020★ 5 cited

A unique discrimination between new physics scenarios in $b \to s μ^{+} μ^{-}$ anomalies

Ashutosh Kumar Alok, Suman Kumbhakar, S. Uma Sankar

A number of observables related to the $b \to s ℓ^{+} ℓ^{-}$ transition show deviations from their standard model predictions. A global fit to the current $b\rightarrow s\ell^+\e…

hep-ph2019★ 4 cited

A global fit to $b \to c τ ν ˉ$ anomalies after Moriond 2019

Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar +1

At Moriond 2019, Belle collaboration announced their new measurements on $R_{D}$ and $R_{D^{*}}$ which are in agreement with their Standard Model (SM) predictions within $1.2 σ$ . After…

hep-ph2019

$B_{s}^{*} \to l^{+} l^{-}$ decays in light of recent $B$ anomalies

Suman Kumbhakar, Jyoti Saini

Some of the recent measurements in the neutral current sector $b \to s l^{+} l^{-}$ ( $l = e$ or $μ$ ) as well as in the charged current sector $b \to c τ ν ˉ$ show signific…

hep-ph2019★ 16 cited

Implication of $R_{D^{(*)}}$ anomalies on semileptonic decays of $Σ_{b}$ and $Ω_{b}$ baryons

N Rajeev, Rupak Dutta, Suman Kumbhakar

The flavor changing decays of heavy bottom quarks to the corresponding lighter quarks ( $u$ , $c$ and $s$ ) in various $B$ -meson decays via charged current and neutral current semilep…

hep-ph2019★ 1 cited

Resolving $R_{D}$ and $R_{D^{*}}$ anomalies

Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar +1

The current world averages of the ratios $R_{D^{(*)}}$ are about $4 σ$ away from their Standard Model prediction. These measurements indicate towards the violation of lepton flavor…

hep-ph2019★ 3 cited

Flavor signatures of complex anomalous $t c Z$ couplings

Suman Kumbhakar, Jyoti Saini

In this work we study the effects of anomalous $t c Z$ couplings. Such couplings would potentially affect several neutral current decays of $K$ and $B$ mesons via $Z$ -penguin diagram…

hep-ph2019★ 41 cited

Solutions to $R_{D}$ - $R_{D^{*}}$ in light of Belle 2019 data

Ashutosh Kumar Alok, Dinesh Kumar, Suman Kumbhakar +1

Earlier this year, the Belle collaboration presented their new measurements of $R_{D}$ and $R_{D^{*}}$ using a new method. These measurements are consistent with the Standard Model pre…

hep-ph2018★ 14 cited

New physics effects in purely leptonic $B_{s}^{*}$ decays

Suman Kumbhakar, Jyoti Saini

Recently several measurements in the neutral current sector $b \to s l^{+} l^{-}$ ( $l = e$ or $μ$ ) as well as in the charged current sector $b \to c τ ν ˉ$ show significan…

hep-ph2018★ 29 cited

Resolution of $R_{D}$ / $R_{D^{*}}$ puzzle

Ashutosh Kumar Alok, Dinesh Kumar, Suman Kumbhakar +1

One of the exciting results in flavor physics in recent times is the $R_{D}$ / $R_{D^{*}}$ puzzle. The measurements of these flavor ratios performed by the B-factory experiments, BaBar a…

hep-ph2017★ 94 cited

New physics solutions for $R_{D}$ and $R_{D^{*}}$

Ashutosh Kumar Alok, Dinesh Kumar, Jacky Kumar +2

Recent measurements of $R_{D^{*}}$ have reduced tension with the Standard Model prediction. Taking all the present data into account, we obtain the values of the Wilson coefficients…

A U-spin Puzzle in B Decays

Lepton Flavor Violating B→K2∗​(1430)μ±τ∓ Decays

New physics in b→se+e−: A model independent analysis

Investigating the effect of U1​ vector leptoquark on b→uτνˉ mediated B decays

Signatures of complex new physics in b→cτνˉ transitions

New Physics solutions for b→cτνˉ anomalies after Moriond 2019

A unique discrimination between new physics scenarios in b→sμ+μ− anomalies

A global fit to b→cτνˉ anomalies after Moriond 2019

Bs∗​→l+l− decays in light of recent B anomalies

Implication of RD(∗)​ anomalies on semileptonic decays of Σb​ and Ωb​ baryons

Resolving RD​ and RD∗​ anomalies

Flavor signatures of complex anomalous tcZ couplings

Solutions to RD​-RD∗​ in light of Belle 2019 data

New physics effects in purely leptonic Bs∗​ decays

Resolution of RD​/RD∗​ puzzle

New physics solutions for RD​ and RD∗​

A U-spin Puzzle in $B$ Decays

Lepton Flavor Violating $B \to K_{2}^{*} (1430) μ^{\pm} τ^{\mp}$ Decays

New physics in $b \to s e^{+} e^{-}$ : A model independent analysis

Investigating the effect of $U_{1}$ vector leptoquark on $b \to uτ ν ˉ$ mediated $B$ decays

Signatures of complex new physics in $b \to c τ ν ˉ$ transitions

New Physics solutions for $b \to c τ ν ˉ$ anomalies after Moriond 2019

A unique discrimination between new physics scenarios in $b \to s μ^{+} μ^{-}$ anomalies

A global fit to $b \to c τ ν ˉ$ anomalies after Moriond 2019

$B_{s}^{*} \to l^{+} l^{-}$ decays in light of recent $B$ anomalies

Implication of $R_{D^{(*)}}$ anomalies on semileptonic decays of $Σ_{b}$ and $Ω_{b}$ baryons

Resolving $R_{D}$ and $R_{D^{*}}$ anomalies

Flavor signatures of complex anomalous $t c Z$ couplings

Solutions to $R_{D}$ - $R_{D^{*}}$ in light of Belle 2019 data

New physics effects in purely leptonic $B_{s}^{*}$ decays

Resolution of $R_{D}$ / $R_{D^{*}}$ puzzle

New physics solutions for $R_{D}$ and $R_{D^{*}}$