Ishtiaq Ahmed

activity

20232026

most citedProbing New Physics in light of recent developments in

b \to c ℓ ν

transitions

6 citations · 16 across the 8 of their papers we have counts for

collaborators

9 papers

hep-ph2026

Hyperfine Mixing and Final-Spin Redistribution in Inclusive $Ξ_{b c} \to H_{cc} + X$

Ishtiaq Ahmed

In this work, we study the effect of hyperfine mixing on the inclusive weak transition $Ξ_{b c} \to H_{cc} + X$ , which has been proposed as a useful channel for searching for beauty-ch…

hep-ph2026

Weak decay of the positronium ion

Nishat Ul Sani, M. Jamil Aslam, Ishtiaq Ahmed

The positronium ion ( $Ps^{-}$ ), a coulombic three-body bound state of two electrons and a positron, predominantly decays via electron-positron annihilation into electromagne…

hep-ph2026

A Phenomenological Study of Semileptonic $B^{+}$ and $B_{s}^{0}$ Decays into Axial-Vector Mesons $(D_{1} (2420), D_{1}^{'} (2430), D_{s 1} (2460), and D_{s 1}^{'} (2536))$ within the Standard Model

Rana Khan, Qazi Maaz Us Salam, Zohaib Aarfi +1

We study semileptonic $B$ meson decays $B^{+} \to D_{1}^{(')} ℓ^{+} ν_{ℓ}$ and $B_{s}^{0} \to D_{s 1}^{- (')} ℓ^{+} ν_{ℓ}$ , where $ℓ = μ, τ$ . The final state axial vector mesons ar…

hep-ph2026

The Angular Observables of $Λ_{b} \to Λ_{c} (\to Λ^{0} π^{+}) τ^{-} (\to π^{-} ν_{τ}) ν ˉ_{τ}$ within the Paradigm of FCCC Anomalies

Muhammad Arslan, Ishtiaq Ahmed, Muhammad Jamil Aslam

We present a global analysis of the current $B$ -meson flavor anomalies and extend it to the baryonic sector through the decay $Λ_{b}^{0} \to Λ_{c}^{+} (\to Λ^{0} π^{+}) τ^{-} (\to π^{-} ν_{τ}) ν ˉ_{τ}$ …

hep-ph2025★ 1 cited

Addressing the $R_{τ / μ, e} (D^{(*)})$ puzzle through New Physics four-fermion operators and their impact on $Λ_{b} \to Λ_{c} τ ν ˉ_{τ}$ decay

Muhammad Arslan, Ishtiaq Ahmed, Muhammad Jamil Aslam +2

The Lepton Flavor Universality ratio $R_{τ / μ, e} (D^{(*)})$ poses a challenge to the Standard Model (SM), as B-factory experiments, BaBar, Belle, and the LHCb show $3.31…

hep-ph2024★ 5 cited

Exploring New Physics in transition $b \to s ℓ^{+} ℓ^{-}$ through different $B_{c} \to D_{s}^{(*)} ℓ^{+} ℓ^{-}$ observables

Qazi Maaz Us Salam, Ishtiaq Ahmed, Rizwan Khalid +1

Inspired by the discrepancies observed in the $b \to s ℓ^{+} ℓ^{-}$ neutral current decays, we study the decay channel $B_{c} \to D_{s}^{(*)} ℓ^{+} ℓ^{-}$ ( $ℓ = μ, τ$ ), which is ba…

hep-ph2024

Signature decay modes of the compact doubly-heavy tetraquarks $T_{bb u ˉ d ˉ}$ and $T_{b c u ˉ d ˉ}$

Ahmed Ali, Ishtiaq Ahmed, Muhammad Jamil Aslam

Based on the expectations that the lowest-lying doubly-bottom tetraquark $T_{bb u ˉ d ˉ}$ ( $J^{P} = 1^{+}$ ) and the bottom-charm tetraquark $T_{b c u ˉ d ˉ}$ ( $J^{P} = 0^{+}$ ) are…

hep-ph2024★ 6 cited

Probing New Physics in light of recent developments in $b \to c ℓ ν$ transitions

Tahira Yasmeen, Ishtiaq Ahmed, Saba Shafaq +2

The experimental studies of the observables associated with the $b \to c$ transitions in the semileptonic $B -$ meson decays at BaBar, Belle and LHCb have shown some deviati…

hep-ph2023★ 4 cited

Analysis of $b \to c τ ν ˉ_{τ}$ anomalies using weak effective Hamiltonian with complex couplings

Muhammad Arslan, Tahira Yasmeen, Saba Shafaq +2

Recently, the experimental measurements of the branching ratios and different polarization asymmetries for the processes occurring through flavor-changing-charged current $b\righta…

Hyperfine Mixing and Final-Spin Redistribution in Inclusive Ξbc​→Hcc​+X

Weak decay of the positronium ion

A Phenomenological Study of Semileptonic B+ and Bs0​ Decays into Axial-Vector Mesons (D1​(2420),D1′​(2430),Ds1​(2460),and Ds1′​(2536)) within the Standard Model

The Angular Observables of Λb​→Λc​(→Λ0π+)τ−(→π−ντ​)νˉτ​ within the Paradigm of FCCC Anomalies

Addressing the Rτ/μ,e​(D(∗)) puzzle through New Physics four-fermion operators and their impact on Λb​→Λc​τνˉτ​ decay

Exploring New Physics in transition b→sℓ+ℓ− through different Bc​→Ds(∗)​ℓ+ℓ− observables

Signature decay modes of the compact doubly-heavy tetraquarks Tbbuˉdˉ​ and Tbcuˉdˉ​

Probing New Physics in light of recent developments in b→cℓν transitions

Analysis of b→cτνˉτ​ anomalies using weak effective Hamiltonian with complex couplings

Hyperfine Mixing and Final-Spin Redistribution in Inclusive $Ξ_{b c} \to H_{cc} + X$

A Phenomenological Study of Semileptonic $B^{+}$ and $B_{s}^{0}$ Decays into Axial-Vector Mesons $(D_{1} (2420), D_{1}^{'} (2430), D_{s 1} (2460), and D_{s 1}^{'} (2536))$ within the Standard Model

The Angular Observables of $Λ_{b} \to Λ_{c} (\to Λ^{0} π^{+}) τ^{-} (\to π^{-} ν_{τ}) ν ˉ_{τ}$ within the Paradigm of FCCC Anomalies

Addressing the $R_{τ / μ, e} (D^{(*)})$ puzzle through New Physics four-fermion operators and their impact on $Λ_{b} \to Λ_{c} τ ν ˉ_{τ}$ decay

Exploring New Physics in transition $b \to s ℓ^{+} ℓ^{-}$ through different $B_{c} \to D_{s}^{(*)} ℓ^{+} ℓ^{-}$ observables

Signature decay modes of the compact doubly-heavy tetraquarks $T_{bb u ˉ d ˉ}$ and $T_{b c u ˉ d ˉ}$

Probing New Physics in light of recent developments in $b \to c ℓ ν$ transitions

Analysis of $b \to c τ ν ˉ_{τ}$ anomalies using weak effective Hamiltonian with complex couplings