XXV DAE-BRNS High Energy Physics Symposium 2022

Session

WG8 - Quark and Lepton Flavour Physics

12 Dec 2022, 15:00

LH4 (IISER Mohali)

Conveners

WG8 - Quark and Lepton Flavour Physics: D1-S1 - Parallel - 4

• Dinesh Kumar (University of Rajasthan , Jaipur)
• Dr. Rukmani Mohanta
• Soumitra Nandi (IIT Guwahati)
• Saurabh Sandilya (Indian Institute of Technology Hyderabad)

WG8 - Quark and Lepton Flavour Physics: D2-S1 - Parallel - 5

• Saurabh Sandilya (Indian Institute of Technology Hyderabad)
• Dr. Rukmani Mohanta
• Soumitra Nandi (IIT Guwahati)
• Dinesh Kumar (University of Rajasthan , Jaipur)

WG8 - Quark and Lepton Flavour Physics: D4 - S8 - Parallel - 2

• Rukmani Mohanta (University of Hyderabad)
• Saurabh Sandilya (IIT (Hyderbad))
• Dinesh Kumar (University of Rajasthan , Jaipur)
• Soumitra Nandi (IIT Guwahati)

792. CLFV searches in the tau sector

Swagato Banerjee (University of Louisville (US))

12/12/2022, 15:00

Minireview Talk

Charged lepton flavor violation has long been recognized as an unambiguous signature of New Physics. Here, we describe the physics capabilities and discovery potential of New Physics models with charged lepton flavor violation in the tau sector as its experimental signature. Current experimental status from the B-Factory experiments BaBar, Belle and Belle II, and future prospects at Super Tau...

95. Implications of new physics in semileptonic $b \to c l \bar \nu_l$ transitions.

Ms Aishwarya Bhatta (UNIVERSITY OF HYDERABAD)

12/12/2022, 15:30

Talk

Several indications of lepton non-universality observables have been perceived in semileptonic $B$ meson decay processes, both in the neutral-current ($b \to s ll $) and charged-current ($b \to c l \bar \nu_l$) transitions, recently. Influenced by these fascinating quotients, we examine the semileptonic decays involving the $b \to c l \bar \nu_l$ quark level transitions. We execute it...

327. Radiatively generated quarks and lepton masses in extended gauge theories

GURUCHARAN MOHANTA (Physical Research Laboratory, Ahmedabad, India)

12/12/2022, 15:45

Talk

The hierarchical structure of fermion masses and mixings is a major unsolved problem in the Standard model. Fermion masses as radiative corrections emerge as one of the reliable explanations for this problem. We propose a framework based on a class of abelian gauge symmetries in which the masses of only the third generation quarks and leptons arise at the tree level, and the lighter...

244. Measurement of CP-violating phase φ_s in the B0_s → J/ψφ → μ+μ−K+K− channel in pp collisions at √s = 13 TeV

Samadhan Kamble (Indian Institute of Technology Madras (IN))

12/12/2022, 16:00

Talk

The measurement of CP violating weak phase $\phi_s$ is achieved using the data collected by the CMS experiment at $\sqrt{s}=13$ TeV in the sample of 48500 reconstructed $B^0_s\rightarrow J/\psi \phi \rightarrow \mu^+\mu^-K^+K^-$ events corresponding to an integrated luminosity of 96.4fb$^{-1}$. The parameters are extracted by performing a time-dependent and flavor-tagged angular analysis of...

399. Direct CP asymmetry in Z' models

Shireen Gangal

13/12/2022, 11:00

Talk

We consider $Z'$ models that can generate the two `1D’ new physics scenarios with Wilson coefficients $C_9^{\rm NP} <0$ and $C_9^{\rm NP} = -C_{10}^{\rm NP}$, to account for the anomalies in $b \to s \ell \ell$ decays. We present the $1\sigma$ favored parameter space of these two classes of models using updated constraints from $CP$-conserving and $CP$-violating observables, $B_s$-mixing and...

421. Search for lepton flavor violating decays of heavy resonances and quantum black holes in dilepton final states with full Run2 CMS data

Dr Amandeep Kaur Kalsi (Punjab Agricultural University, Ludhiana)

13/12/2022, 11:15

Talk

Several extensions of the standard model (SM) predict the existence of heavy particles that undergo lepton flavor violating (LFV) decays, thereby motivating searches to look for deviations from the SM in the dilepton final states. This talk will present the recent results on the search for such heavy resonances and quantum black holes in the eμ, eτ, and μτ mass spectra using the proton-proton...

376. $D_q^\ast \to D_q \gamma:$ Probing the inner structure of charm mesons

Anshika Bansal (Physical Research Laboratory, Ahmedabad)

13/12/2022, 11:30

Talk

The distribution amplitudes (DAs) for a heavy quark system are not known well and are very challenging. One tries to model them using heavy quark effective field theory. However, there is a free parameter involved which is related to the inverse moments of DAs.  Its value needs to be fixed using some experimental data. For the case of B-meson, it is done using the information on the $B \to...

97. Scrutinizing the effects of new physics in $\Lambda_b\to \Lambda^{(*)}\mu^{+}\mu^{-}$ and $\Lambda_b\to \Lambda^{(*)}\nu\bar{\nu}$ baryonic decays

Nilakshi Das

13/12/2022, 11:45

Talk

Due to the loop suppression in the standard model, the flavor changing neutral current transition decays provide an ideal plateform to look for physics beyond the standard model. Latest LHCb measurements on various flavor observables in $b \to s \ell^{+}\ell^{-}$ quark level transition decays show significant deviation from the standard model expectations. Similarly, very recently Belle II...

277. Search for the decay Bs --> pi0 pi0 at Belle

Jyotirmoi Borah

13/12/2022, 12:00

Poster

The Belle experiment at KEK, Japan has at present one of the largest dataset accumulated at $\Upsilon(5\rm S)$ resonance. This dataset produced at $e^+e^-$ centre-of-mass (CM) energy of approximately $10.86$ GeVs correspond to an integrated luminosity of $121.4$ fb$^{-1}$. We have searched for the rare decay for the first time using this accumulated dataset.
The decay is a neutral,...

360. Measurement of lepton flavour universality ratio at Belle II

Soumen Halder (Tata Institute of Fundamental Reseach)

13/12/2022, 12:15

Talk

Decays mediated by the flavour-changing neutral current transition $b\to s\ell^{+}\ell^{-}$ are not allowed at tree level in the standard model (SM) and can only proceed via higher-order loop diagrams. Such suppressed decays provide an excellent avenue to search for physics beyond the SM. The $B\to K\ell^{+}\ell^{-}$ ($ell = e, \mu$) decays have recently sparked a lot of interest in a...

622. Measurement of strong-phase difference between $D_0$ and $\bar{D_{0}} \to K_{S}^{0}K^{+}K^{-}$ at BESIII

Dr Krishnakumar Ravindran (TIFR)

13/12/2022, 12:30

Talk

We measure the strong-phase difference between $D^{0}$ and $\bar{D_{0}}\to K_{S}^{0}K^{+}K^{-}$ using a data sample corresponding to an integrated luminosity of 2.92 ${\rm fb}^{-1}$ collected in $e^{+}e^{-}$ collisions at a centre-of-mass energy corresponding to the mass of the $\psi(3770)$. The D0-D0bar meson pairs produced are in a quantum-correlated state, their subsequent...

791. B anomalies: an experimental perspective

James Libby (Indian Institute of Technology Madras (IN))

15/12/2022, 15:00

Minireview Talk

A review of results related to the so called B anomalies is presented. The results come both the e+e- B factories and LHC. The talk concludes with a discussion of some the recent results from Belle II experiment related to anomalies.

32. First time-dependent analysis of $B^{0} \to K^{0} \pi^{0}$ decays at Belle II

Mr SAGAR HAZRA (TIFR)

15/12/2022, 15:30

Talk

The $B^{0}\to K^{0}\pi^{0}$ decay is mediated by flavor-changing neutral currents, which are suppressed in the standard model (SM), and it provides an indirect route to search for beyond-the-SM particles. The decay is a key factor in improving the sensitivity of the $K$--$\pi$ isospin sum-rule. The first time-dependent analysis of the decay within Belle II is performed using a sample of...

256. $\Lambda_b → p\tau\bar{\nu}$ decay in $U_1$ leptoquark model.

Shabana Khan

15/12/2022, 15:45

Talk

The measurements of several lepton flavor universality (LFU) violating observables in the decays induced by the quark level transition $b → c\tau \bar{\nu}$ provide the hint of physics beyond the standard model. These deviations can be resolved by adding a single vector leptoquark to the Standard Model. To further explore this leptoquark, we estimate the leverage of new physics in $b → c\tau...

73. Constraining New Physics with Possible DM Signatures from the Study of FCNC Processes

Lipika Kolay (IIT Guwahati)

15/12/2022, 16:00

Talk

We constrain the parameter space of a simplified dark matter model with a spin-0 mediator and a fermionic dark matter from low energy observables like anomalous magnetic moment, FCNC processes like neutral meson mixing, rare decays of $ B_0, B_s^0, K $ meson, semileptonic $ b \to s \ell \ell $ decays, invisible decays of B and K meson and process like $ t \to b W_{\mu} $ decay. FCNC is...

218. Measurement of Bs0 lifetime in Bs0 → J/ΨKs0 decay mode

Priyanka Sadangi (National Institute of Science Education and Research (NISER) (IN))

15/12/2022, 16:15

Talk

The study of B decays has led to a much better understanding in the flavor sector of the SM. In the CP-violation study, the measurement of sin(2β) has an important role. The “golden channel” Bd0 → J/ΨKs0, plays an outstanding role for a clean measurement of sin(2β), where β is one of the angles of the CKM unitarity triangle. The channel Bs0 → J/ΨKs0, is related to Bd0 → J/ΨKs0 through...

690. Status of flavour Anomalies from B

James Libby

Minireview Talk