ସତ୍ୟଜିତ ପୁହାଣ

Diffractive Vector-Meson Production from the Light-Front Quark Model

2026-09-30T00:00:00+00:00

ଲେଖକ: S. Puhan
ପ୍ରକାଶିତ: e-Print: 2609.39647 [hep-ph]

arXiv:2609.39647</a> · INSPIRE-HEP record</a>

ସାରାଂଶ</h3>
We study exclusive diffractive electroproduction of the ρ^0, ϕ, J/ψ, and ψ(2S) mesons in the color-dipole picture using two spin-orbit light-front wave functions, S-1 and S-2. S-1 follows from the Melosh--Wigner rotation in the light-front quark model (LFQM), while S-2 is the spin-improved form commonly used in holographic and boosted-Gaussian approaches. Both share the same radial wave function, with their parameters determined from the LFQM Hamiltonian. The color-glass-condensate dipole parameters are fixed from inclusive structure-function data, with no fit to diffractive data. We compare the predictions with measurements of cross sections, R=σ_L/σ_T, t and W dependences, and σ_ϕ/σ_ρ. S-1 gives a better description of the light-meson observables, while S-2 provides a better description of the charmonium ratio σ_ψ(2S)/σ_J/ψ and the J/ψ decay constant. We also present the charge, magnetic, and quadrupole form factors of the four mesons and compare them with available lattice-QCD results

Leading-Neutron Electroproduction at HERA and the EIC: Sullivan Process, Target Fragmentation, and Pion PDFs

2026-09-03T00:00:00+00:00

ଲେଖକ: W. Chang, C. Hsieh, S. Puhan
ପ୍ରକାଶିତ: e-Print: 2609.03368 [hep-ph]
arXiv:2609.03368</a> · INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Leading-neutron electroproduction measurements from the H1 and ZEUS experiments at HERA have been used to constrain pion parton distribution functions (PDFs) at small momentum fractions within the Sullivan one-pion-exchange (OPE) framework, complementing large-x_π constraints from pion-induced Drell--Yan measurements. Previous analyses have focused primarily on the region of large neutron longitudinal momentum fraction, x_L, where contributions from deep-inelastic scattering (DIS) target fragmentation are suppressed. In this work, we use the Pythia event generator to model the target-fragmentation contribution and show that its combination with the OPE contribution reproduces the main features of the HERA leading-neutron data over the full measured x_L range without introducing additional ad hoc normalization factors. This result demonstrates the potential of incorporating a broader range of leading-neutron data into future global analyses, thereby extending sensitivity to smaller pion momentum fractions x_π. We investigate the model dependence associated with the pion--nucleon vertex form factor and show that the HERA data are sensitive to different target-fragmentation treatments implemented in Pythia. Finally, we present projections for leading-neutron production at the future U.S. Electron-Ion Collider (EIC), identifying beam-energy configurations and kinematic regions that provide enhanced sensitivity to pion structure while suppressing DIS target-fragmentation contributions

Extraction of Pion Unpolarized Quark and Gluon Generalized Parton Distributions using Deep Neural-Networks

2026-08-07T00:00:00+00:00

ଲେଖକ: S. Puhan, S. Sharma, N. Kumar
ପ୍ରକାଶିତ: e-Print: 2608.07085 [hep-ph]
arXiv:2608.07085</a> · INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
We present a deep neural-network (DNN) extraction of the pion unpolarized quark and gluon generalized parton distributions (GPDs) using the corresponding parton distribution functions (PDFs) from the JAM21 and xFitter analysis, together with experimental measurements of the pion electromagnetic form factor (EMFF) and lattice quantum chromodynamics (QCD) results. The GPDs are parameterized using a physics-informed neural-network (PINN) that incorporates the known PDF behavior, an exponential momentum-transfer dependence, and a trainable neural network (NN) component. The network parameters are determined by minimizing a χ^2-based loss function. For the valence-quark GPDs, the loss function includes contributions from the EMFF, squared EMFF, charge-normalization constraints, and regularization terms. For the gluon GPDs, it incorporates constraints from the gluon gravitational form factors together with regularization. This framework enables a flexible, nonparametric extraction while preserving the essential theoretical and phenomenological constraints. By employing the full ensemble of available PDF replicas, we quantify the uncertainties of the extracted GPDs over a broad kinematic range in the longitudinal momentum fraction and momentum transfer, with the uncertainty bands corresponding to the 1σ confidence interval. The extracted valence-quark GPDs are found to be in good agreement with available lattice-QCD calculations. Our study demonstrates that DNN-based methods provide a flexible and robust framework for extracting pion GPDs and probing the multidimensional internal structure of the pion, offering a promising avenue for future investigations of hadron tomography

Mechanical distribution of the pseudoscalar charmonium and bottomonium on the light-front

2026-06-05T00:00:00+00:00

Authors: A. Dwivedi, S. Puhan, and S. Ghosh
Published in: e-Print: 2606.07073 [hep-ph]
Read on arXiv →</a>
Pressure Distribution in Pseudoscalar Mesons</h3>
The pressure distribution $P(z_\perp)$ in the transverse plane for the mesons $\eta_c$ (left) and $\eta_b$ (right) shows a node where it changes sign from positive (repulsive) to negative (attractive) with increasing transverse distance $z_\perp$:

Figure 1: The pressure distribution in the transverse plane for the mesons $\eta_c$ (left) and $\eta_b$ (right). Also shown are the pressure range of the quark-gluon plasma (QGP) from lattice QCD simulations, the peak pressure in the proton, and the range of peak pressure values in the pion. </div>

Moderate-to-Large-x Gluon Helicity from J/psi Production at sqrt(s) = 27 GeV

2026-05-29T00:00:00+00:00

Authors: S. Sharma, A. Aparin, S. Puhan, N. Kumar, and H. Dahiya
Published in: e-Print: 2605.30945 [hep-ph]
Read on arXiv →</a>
Kinematics and Rapidity Coverage</h3>
The partonic momentum fractions $x_{1,2}$ probed in NICA SPD kinematics ($\sqrt{s} = 27$ GeV) as a function of rapidity $y$ for different transverse momentum $p_T$ values:

Figure 1: (Left) Partonic momentum fractions $x_{1,2}$ as a function of rapidity for various $p_T$. (Right-a) Longitudinal double-spin asymmetry $A_{LL}^{J/\psi}$ vs $y$ for $p_T = 1.5, 3.0, 5.0$ GeV. (Right-b) Theoretical uncertainties for $p_T = 3.0$ GeV. </div>
Uncertainty Analysis</h3>
The relative fractional uncertainties at ($\sqrt{s} = 27$ GeV) and $p_T = 3$ GeV, highlighting the PDF, scale, and total uncertainties:

Figure 2: Relative uncertainties of $A_{LL}^{J/\psi}$ as a function of rapidity $y$ at $p_T = 3$ GeV, separating PDF uncertainty, scale uncertainty, and total uncertainty. </div>

Analysis on the parton distribution functions of heavy mesons

2026-05-17T00:00:00+00:00

ଲେଖକ: S. Puhan
ପ୍ରକାଶିତ: Phys. Rev. D 114 (2026)
DOI: 10.1103/6gjf-24ll</a> · arXiv:2605.17389</a> · INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
In this work, we investigate the constituent parton distribution functions (PDFs) of the kaon and heavy pseudoscalar mesons within the light-cone quark model. Starting from the initial-scale quark and antiquark PDFs, obtained by evaluating the quark-quark correlation functions for individual mesons, we perform QCD evolution to determine their partonic structure at higher energy scales. The QCD evolution is carried out using the next-to-leading-order (NLO) Dokshitzer-Gribov-Lipatov-Altarelli-Parisi equations. We further compute the average longitudinal momentum fractions carried by the individual constituents at both the model and evolved scales. In addition, we predict the NLO structure functions of the kaon at energy scales relevant to the upcoming Electron-Ion Collider (EIC). For the COMPASS++/AMBER experiment, we also present detailed predictions for the NLO Drell-Yan cross sections induced by both K+ and K- beams, using carbon, tungsten, and aluminum as nuclear targets. Finally, we demonstrate the dominance of the heavier constituents over the lighter constituents in heavy mesons in terms of the momentum fractions they carry

EIC-Asia Workshop on QCD and Hadron Structure 2026 — Academia Sinica, Taipei

2026-05-01T00:00:00+00:00

Workshop: EIC-Asia Workshop on QCD and Hadron Structure</a>
Venue: Institute of Physics, Academia Sinica, Taipei, Taiwan
Dates: April 29 – May 1, 2026
Mode: In person
I attended the EIC-Asia Workshop on QCD and Hadron Structure hosted at the Institute of Physics, Academia Sinica, Taipei. The workshop brought together experts in experiments, phenomenology, and lattice calculations relevant to the upcoming Electron-Ion Collider (EIC).

Extraction of Pion GPDs — Prof. C. R. Ji's Group

2026-04-17T00:00:00+00:00

Talk Title: Extraction of Pion GPDs
Mode: Zoom Meeting | Group: Prof. C. R. Ji's Research Group, NCSU, USA
View Talk →</a>
Abstract</h2>
In this talk, I present our recent work on the data-driven extraction of the unpolarized quark Generalized Parton Distributions (GPDs) of the pion at zero skewness. Using a global fit to experimental pion electromagnetic form factor and PDF data, we determine the pion GPDs through a flexible parameterization embedded in a GPD framework with collinear PDFs and a profile function encoding transverse dynamics. Impact-parameter-space interpretations of the spatial parton distributions are discussed, revealing the internal structure of the lightest QCD bound state. The results provide essential input for future experiments at EIC, JLab 12 GeV, COMPASS, and AMBER.

Extraction of Pion Unpolarized Quark Generalized Parton Distribution from Charge Form Factors

2026-04-13T00:00:00+00:00

ଲେଖକ: S. Puhan, S. Sharma, N. Kumar, H. Dahiya
ପ୍ରକାଶିତ: e-Print: 2604.11116 [hep-ph]
arXiv:2604.11116</a> · INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Based on a global fit to experimental measurements of the pion electromagnetic form factor and parton distribution functions (PDFs), we report a data-driven determination of the unpolarized quark generalized parton distributions (GPDs) for the case of pion in the zero-skewness limit (ξ= 0). The form factor is parameterized using a flexible functional form constrained by data and embedded into a GPD framework constructed from collinear PDFs and a profile function encoding transverse dynamics. This approach provides a unified description of the pion's electromagnetic structure and its spatial parton distributions. We present the extracted pion GPDs and their impact-parameter-space interpretations, offering new insights into the internal structure of the lightest QCD bound state and providing essential input for future electron-ion collider studies via the Sullivan process, as well as for the exclusive π^+ electroproduction at the 12~GeV Jefferson Lab program, pion-induced exclusive measurements at COMPASS, proposed pion-beam experiments at AMBER, and phenomenological and lattice investigations of the structure of the meson

🚀 Starting a New Research Chapter in Taiwan — Academia Sinica

2026-04-07T00:00:00+00:00

I have joined the Academia Sinica as a Research Assistant at the Institute of Physics, working under the supervision of Prof. Wen-Chen Chang.
My work focuses on:

🔹 Detector development for the ePIC experiment (Zero-Degree Calorimeter)</li>
🔹 Global analysis of pion and kaon Parton Distribution Functions (PDFs)</li> </ul>

Pion parton distribution functions in the light-cone quark model and experimental constraints

2026-04-07T00:00:00+00:00

ଲେଖକ: H. G. P, S. Puhan, A. K. P., R. Pandey, H. Dahiya, A. Kumar, S. Dutt
ପ୍ରକାଶିତ: Phys. Rev. D 114 (2026)
DOI: 10.1103/q5rc-999c</a> · arXiv:2604.05762</a> · INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
In this work, we investigate the valence quark parton distribution functions (PDFs) of the pion within the light-cone quark model. The initial quark PDFs are calculated by solving the quark-quark correlation function for the pseudoscalar mesons. The initial quark PDFs have been evolved to higher energy scales through the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations. We also find that our calculated evolved PDFs match experimental and available theoretical extraction data. For the first time, we have also predicted the F2 structure function at next-to-leading (NLO) order accuracy. The calculated F2 structure function has been compared with the available ZEUS and H1 experimental data at DESY-HERA over a wide range of energy scales. Additionally, we display the forward pion production cross-section for the Drell-Yan process caused by pions using the pion PDFs that were calculated and the target nucleon PDFs from the LHAPDF nucleus datasets. The evolved F2 structure function of the pion has been studied at the upcoming electron-ion collider energy kinematics. Overall, it was observed that the quark PDFs of pions computed using the light-cone quark model are consistent with the experimental results

PhD Thesis — Acknowledgements

2026-04-05T00:00:00+00:00

A heartfelt note of gratitude to everyone who shaped my PhD journey — my mentors, collaborators, friends, and institutions.

Distribution Functions of Radially Excited Pion using the Light-Front Quark Model

2026-01-10T00:00:00+00:00

Authors: A. Dwivedi, S. Puhan, and S. Ghosh
Published in: Communicated in PLB
Read on arXiv →</a>

Spectroscopy of rho-meson in symmetric nuclear medium

2026-01-05T00:00:00+00:00

Authors: Anshu Gautam, Tanisha, S. Puhan, A. Kumar, and H. Dahiya
Published in: Accepted in Physical Review D
Read on arXiv →</a>

Extraction of f_1(x, fk^2_perp) quark TMDs of proton from E288 Drell-Yan data

2026-01-01T00:00:00+00:00

ଲେଖକ: H. G. P, R. Pandey, S. Puhan, S. Dutt, H. Dahiya, A. Kumar
ପ୍ରକାଶିତ: DAE Symp. Nucl. Phys. 69 (2026)
INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Abstract not yet available from INSPIRE-HEP.

Extraction of Pion Parton Distribution Function using NN

2026-01-01T00:00:00+00:00

ଲେଖକ: S. Puhan, H. Dahiya
ପ୍ରକାଶିତ: DAE Symp. Nucl. Phys. 69 (2026)
INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Abstract not yet available from INSPIRE-HEP.

Extraction of unpolarized quark TMDs of proton from FNAL-E-0605 data using iminuit

2026-01-01T00:00:00+00:00

ଲେଖକ: A. K. P, R. Pandey, S. Puhan, S. Dutt, H. Dahiya, A. Kumar
ପ୍ରକାଶିତ: DAE Symp. Nucl. Phys. 69 (2026)
INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Abstract not yet available from INSPIRE-HEP.

Impact of isospin asymmetric nuclear medium on pseudoscalar and vector B-mesons

2026-01-01T00:00:00+00:00

Authors: Tanisha, S. Puhan, N. Kaur, A. Kumar and H. Dahiya
Published in: Nucl. Phys. A 1068 (2026)
Read on INSPIRE →</a>

Model-Based Constraints on Proton TMDs

2026-01-01T00:00:00+00:00

ଲେଖକ: S. Sharma, S. Puhan, N. Kumar, H. Dahiya
ପ୍ରକାଶିତ: DAE Symp. Nucl. Phys. 69 (2026)
INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Abstract not yet available from INSPIRE-HEP.

Pion sub-leading twist generalized transverse momentum dependent parton distributions E_2 in light-front quark model

2026-01-01T00:00:00+00:00

ଲେଖକ: S. Puhan, S. Sharma, N. Kumar, H. Dahiya
ପ୍ରକାଶିତ: DAE Symp. Nucl. Phys. 69 (2026)
INSPIRE-HEP record</a>
ସାରାଂଶ</h3>
Abstract not yet available from INSPIRE-HEP.

Valence quark distribution of the pion inside a medium with finite baryon density: A Nambu–Jona-Lasinio model approach

2025-12-01T00:00:00+00:00

Authors: A. Dwivedi, S. Puhan, S. Ghosh, and H. Dahiya
Published in: Accepted in PTEP
Read on arXiv →</a>

Valence quark structure of rho meson using light-front quark model

2025-11-01T00:00:00+00:00

Authors: S. Puhan, S. Sharma, N. Kumar, and H. Dahiya
Published in: Accepted in PRD
Read on arXiv →</a>

Pion GFFs at JINR-BLTP — Dubna, Moscow

2025-08-15T00:00:00+00:00

Talk Title: Gravitational form factor of pion
Mode: In person at Interplay of gravity and strong interactions at BLTP, JINR, Dubna, Moscow
View Conference →</a>
About This Talk</h2>
I presented my recent work on extracting the gravitational form factors (GFFs) of the pion and discussed approaches for their experimental extraction. This talk was part of the "Interplay of gravity and strong interactions" program at the Bogoliubov Laboratory of Theoretical Physics (BLTP), Joint Institute for Nuclear Research (JINR), Dubna, Moscow.

Internal Structure of Light Mesons — Prof. C. R. Ji's Group

2025-07-04T00:00:00+00:00

Talk Title: Internal Structure of Light Mesons through Distribution Functions
Mode: Zoom Meeting | Group: Prof. C. R. Ji's Research Group, NCSU, USA
View Talk →</a>
Abstract</h2>
In this talk, I discuss the internal structure of light mesons such as the pion, kaon, and rho using light-front models. The study focuses on valence quark-level Parton Distribution Functions (PDFs), Generalized Parton Distributions (GPDs), and Transverse Momentum Dependent distributions (TMDs). Additionally, I highlight the mechanical properties of the pion and explore how these distributions behave in a nuclear medium.

D and D* mesons in isospin asymmetric nuclear medium

2025-06-15T00:00:00+00:00

Authors: A. Gautam, D. Singh, N. Kaur, S. Puhan, S. Dutt, H. Dahiya, and A. Kumar
Published in: PTEP ptaf135 (2025)
Read on INSPIRE →</a>

Valence quark distribution of light rho and heavy J/psi vector mesons in light-cone quark model

2025-06-01T00:00:00+00:00

Authors: Tanisha, S. Puhan, A. Yadav, and H. Dahiya
Published in: Phys. Rev. D 112 (2025)
Read on PRD →</a>

Scalar, vector and tensor electromagnetic form factors of pion and kaon

2025-05-15T00:00:00+00:00

Authors: S. Puhan and H. Dahiya
Published in: Phys. Rev. D 111 (2025)
Read on INSPIRE →</a>

Valence quark properties of charged kaons in symmetric nuclear matter

2025-05-01T00:00:00+00:00

Authors: R. Pandey, S. Puhan, N. Kaur, A. Kumar, S. Dutt, and H. Dahiya
Published in: Eur. Phys. J. Plus 140 (2025)
Read on INSPIRE →</a>

Radiative Transitions for the Ground and Excited Charmonia States

2025-04-10T00:00:00+00:00

Authors: A. Yadav, S. Puhan, and H. Dahiya
Published in: Submitted to PRD
Read on INSPIRE →</a>

Understanding the Valence Quark Structure of the Pion through GTMDs

2025-04-01T00:00:00+00:00

Authors: S. Puhan, S. Sharma, N. Kumar and H. Dahiya
Published in: PTEP ptaf100 (2025)
Read on INSPIRE →</a>

Internal structure of pion, kaon, and ρ meson — JINR Seminar

2025-03-28T00:00:00+00:00

Talk Title: Internal structure of pion, kaon, and ρ meson in light front dynamics
Mode: Zoom Meeting | Place: JINR, Dubna, Moscow
View Talk →</a>
Abstract</h2>
The talk focuses on studying the internal structure of pion, kaon, and ρ mesons within light-front models. We systematically explore transverse momentum-dependent parton distributions (TMDs), generalised parton distributions (GPDs), form factors (FFs), and parton distribution functions (PDFs) for these particles.
Additionally, the mechanical properties of the pion and kaon are investigated by calculating pressure and shear distributions through GPDs. The charge radii of these particles are predicted as well, providing insight into their spatial structure.
To further understand the behaviour of the pion and kaon in nuclear environments, these distributions are studied in medium using the chiral SU(3) quark mean field model. The PDFs are evolved to higher Q² scales to facilitate comparison with experimental data.
The upcoming Electron-Ion Collider and NICA will serve as crucial platforms to test and refine these theoretical predictions.

Effect of Asymmetric Nuclear Medium on the Valence Quark Structure of the Kaons

2025-03-01T00:00:00+00:00

Authors: D. Singh, S. Puhan, N. Kaur, M. Kaur, S. Dutt, A. Kumar, and H. Dahiya
Published in: Phys. Rev. D 111 (2025)
Read on INSPIRE →</a>

ICFHEP 2025 — IIT Bhilai, Chhattisgarh

2025-02-14T00:00:00+00:00

Event: International Conference on Frontiers of High Energy Physics (ICFHEP)
Venue: Indian Institute of Technology Bhilai, Chhattisgarh (Feb 13–15, 2025)
Participated in this international conference during my visiting fellowship at IIT Bhilai, where I also worked with Prof. Sabyasachi Ghosh on applications of the NJL model for understanding hadron structure.

Spectroscopy of radially excited charmonia and bottomonia in light-front quark model

2025-02-01T00:00:00+00:00

Authors: R. Acharyya, S. Puhan, N. Kumar and H. Dahiya
Published in: Chin. Phys. C 49 (2025)
Read on arXiv →</a>

Effect of nuclear medium on the spatial distribution of pions

2025-01-20T00:00:00+00:00

Authors: S. Puhan, N. Kaur, A. Kumar, S. Dutt, and H. Dahiya
Published in: Nucl. Phys. B 1017 (2025)
Read on INSPIRE →</a>

Leading-twist TMDs for pion and kaon using power law wave functions

2025-01-10T00:00:00+00:00

Authors: S. Puhan, and H. Dahiya
Published in: ATHICS 2025
arXiv:2604.07049</a> · DOI: 10.1142/S0217732326420113</a> · INSPIRE-HEP record</a>

Transverse and spatial structure of light to heavy mesons in light-front dynamics

2025-01-05T00:00:00+00:00

Authors: S. Puhan, N. Kaur and H. Dahiya
Published in: Phys. Rev. D 111 (2025)
Read on INSPIRE →</a>

Photon Leading Twist Transverse Momentum Dependent Parton Distributions

2025-01-01T00:00:00+00:00

Authors: S. Puhan, N. Kumar and H. Dahiya
Published in: Eur. Phys. J. A 61 (2025)
Read on arXiv →</a>

Kaons structure in dense nuclear medium

2024-12-17T00:00:00+00:00

Authors: A. Kumar, D. Singh, S. Puhan, N. Kaur, M. Kaur, H. Dahiya, and S. Dutt
Published in: DAE HEP 2024
DOI: 10.1007/978-981-95-1513-4_253</a> · INSPIRE-HEP record</a>

Behavior of pion in asymmetric nuclear medium

2024-12-16T00:00:00+00:00

Authors: A. Gautam, D. Singh, S. Puhan, N. Kaur, A. Kumar, H. Dahiya, and S. Dutt
Published in: DAE HEP 2024
DOI: 10.1007/978-981-95-1513-4_224</a> · INSPIRE-HEP record</a>

Valence quark structure of pion using light front dynamics

2024-12-15T00:00:00+00:00

Authors: S. Puhan and H. Dahiya
Published in: DAE HEP 2024
DOI: 10.1007/978-981-95-1513-4_148</a> · INSPIRE-HEP record</a>

In-medium properties of pseudoscalar mesons in symmetric nuclear matter

2024-12-10T00:00:00+00:00

Authors: A. Gautam, D. Singh, S. Puhan, N. Kaur, A. Kumar, H. Dahiya, and S. Dutt
Published in: DAE Nuclear 2024
INSPIRE-HEP record</a>

Spectroscopy of excited states of D+ and D+S meson in the light-front quark model

2024-12-09T00:00:00+00:00

Authors: R. Acharyya, S. Puhan, Narinder Kumar, and H. Dahiya
Published in: DAE Nuclear 2024
Search on INSPIRE-HEP</a>

Spin-1 unpolarized GPDs in light front dynamics

2024-12-08T00:00:00+00:00

Authors: S. Puhan, Narinder Kumar, and H. Dahiya
Published in: DAE Nuclear 2024
INSPIRE-HEP record</a>

Spin-1 Unpolarized GPDs — DAE SNP 2024, IIT Roorkee

2024-12-07T00:00:00+00:00

Talk Title: Spin-1 unpolarized GPDs in Light-front formalism
Venue: 68th DAE Symposium on Nuclear Physics (SNP 2024)</a>, IIT Roorkee, India
Mode: In person
I presented our work on the spin-1 unpolarized generalized parton distributions (GPDs) in the light-front formalism. The talk covered the chiral-even vector quark GPDs of the ρ meson derived using the light-cone quark model, along with the structure functions corresponding to the Rosenbluth scattering cross section.

Radiative transition of ψ(2S) → χc0(1P) + γ in LFQM

2024-12-07T00:00:00+00:00

Authors: A. Yadav, S. Puhan, and H. Dahiya
Published in: DAE Nuclear 2024
Read on ResearchGate →</a>

Understanding photon TMDs with light-front wave function

2024-11-20T00:00:00+00:00

Authors: S. Puhan, N. Kaur, and H. Dahiya
Published in: HP 2024
arXiv:2504.01419</a> · INSPIRE-HEP record</a>

Pion and Kaon Structure at HHIQCD 2024 — Kyoto University

2024-11-01T00:00:00+00:00

Talk Title: Structural analysis of Pion and Kaon with distribution functions
Mode: In person at HHIQCD, Kyoto University, Japan
View Talk →</a>
Abstract</h2>
Pion and kaon are one of the simplest meson structures to study the distribution function. In this work, we have calculated the time reversal quark transverse momentum-dependent parton distribution functions (TMDs) in the light-front based holographic model (LFHM) and quark model (LFQM) up to twist-4.
We have presented the three dimensional structure of T-even TMDs for both the particles in both models. The transverse structure have been discussed with the help of two dimensional contour plot distribution in momentum space and average quark momenta in both the models. The T-even TMDs have also been compared for both the models and evolved to higher Q² to compare with available TMDs extraction data for the case of pion.
The collinear parton distribution functions (PDFs) have also been investigated. The unpolarized f₁(x) PDF have been evolved through DGLAP evolution from Q² = 1 GeV² to 16 GeV² and found significant behavior with experimental results. The spatial structure have also been studied through leading twist GPDs and have been implicated to understand the form factors (FFs).

Does nuclear medium affect the transverse momentum-dependent parton distributions of valence quark of pions?

2024-11-01T00:00:00+00:00

Authors: N. Kaur, S. Puhan, A. Kumar, S. Dutt, and H. Dahiya
Published in: Phys. Lett. B 859 (2024)
Read on ScienceDirect →</a>

TMD Relations: Insights from a Light-Front Quark-Diquark Model

2024-10-01T00:00:00+00:00

Authors: S. Sharma, S. Puhan, N. Kumar and H. Dahiya
Published in: PTEP ptae150 (2024)
Read on INSPIRE →</a>

Pions valence quark distributions in asymmetric nuclear matter at finite temperature

2024-09-01T00:00:00+00:00

Authors: S. Puhan, N. Kaur, A. Kumar, S. Dutt, and H. Dahiya
Published in: Phys. Rev. D 110 (2024)
Read on INSPIRE →</a>

PSI Particle Physics Summer School — Zuoz, Switzerland

2024-08-05T00:00:00+00:00

Event: PSI Particle Physics Summer School — From Low to High: Particle Physics at the Frontier
Venue: Lyceum Alpinum, Zuoz, Switzerland (Aug 4–10, 2024)
Attended this prestigious international summer school covering cutting-edge topics at the frontiers of particle physics, from precision measurements to high-energy collider experiments.

Quark spin-orbit correlations in spin-0 and spin-1 mesons using the light-front quark model

2024-05-15T00:00:00+00:00

Authors: R. Acharyya, S. Puhan and H. Dahiya
Published in: Phys. Rev. D 110 (2024)
Read on INSPIRE →</a>

Leading twist T-even TMDs for the spin-1 heavy vector mesons

2024-03-01T00:00:00+00:00

Authors: S. Puhan and H. Dahiya
Published in: Phys. Rev. D 109 (2024)
Read on PRD →</a>

T-even TMDs for the spin-0 pseudo-scalar mesons upto twist-4 using light-front formalism

2024-02-15T00:00:00+00:00

Authors: S. Puhan, S. Sharma, N. Kaur, N. Kumar and H. Dahiya
Published in: JHEP 075 (2024)
Read Paper →</a>

Pion Structure at ICTS-TIFR 2024 — Bengaluru

2024-02-01T00:00:00+00:00

Talk Title: Structural analysis of pion with distribution functions (TMDs, GPDs and GDAs)
Mode: In person at ICTS, Bengaluru, India
Watch the Talk on YouTube →</a>
About This Talk</h2>
I presented my research on identifying the internal structure of the pion using three complementary types of distribution functions: Transverse Momentum Dependent distributions (TMDs), Generalized Parton Distributions (GPDs), and Generalized Distribution Amplitudes (GDAs).
This talk was part of the program at the International Centre for Theoretical Sciences (ICTS-TIFR), Bengaluru, India.

Internal Structure of Heavy B and D-Mesons — Poster at TIFR

2023-12-01T00:00:00+00:00

Poster Title: Internal Structure of Heavy B and D-mesons
Venue: HQL 2023 Conference</a>, TIFR, Mumbai, India
Mode: In person
I presented a poster on the unpolarized valence quark GPDs and PDFs for heavy spin-0 B- and D-mesons using the light-front quark model.

Spatial and Transverse structure of Heavy B-and D-mesons

2023-11-28T00:00:00+00:00

Authors: S. Puhan and H. Dahiya
Published in: PoS HQL2023
Read on arXiv →</a>