XXVI DAE-BRNS High Energy Physics Symposium 2024

Search for jet quenching with high pT hadron azimuthal anisotropy using subevent cumulants in pPb collisions at CMS

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Postar Heavy ion and QCD

Speaker

Rohit Kumar Singh (Indian Institute of Technology Madras (IN))

Description

Measurements at the LHC have provided evidence for collective behavior in high-multiplicity proton-lead (pPb) collisions through multiparticle correlation techniques. Yet, no conclusive evidence of jet quenching, indicating the energy loss of high-$p_{\mathrm{T}}$ partons as they traverse the medium, has been detected in pPb. This raises the intriguing question: How can a medium described by hydrodynamics, and that significantly modifies the distribution of final-state hadrons, yet has no significant impact on the distribution of high-pT particles? To investigate this, a comprehensive study of differential Fourier coefficients ($v_n$) in particle transverse momentum ($p_{\mathrm{T}}$) and event multiplicity is presented in pPb collisions recorded by the CMS experiment at a nucleon-nucleon center-of-mass energy $\sqrt{s_{{}_{\mathrm{NN}}}}=8.16$ TeV. In particular, new measurements of $p_{\mathrm{T}}$-differential multiparticle cumulants using the subevent method probes an extended phase space region up to a high particle $p_{\mathrm{T}}$. Additionally, we compare the results between pPb and PbPb collisions in the same multiplicity window. This comparison will help assess similarities and differences in the medium's interaction with high-$p_{\mathrm{T}}$ particles in these two collision types.