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We study dimuon events in 2.11/fb of 7 TeV pp collisions, using CMS Open Data, and search for a narrow dimuon resonance with moderate mass (14-66 GeV) and substantial transverse momentum (pT). Applying dimuon pT cuts of 25 GeV and 60 GeV,…

高能物理 - 唯象学 · 物理学 2019-07-24 Cari Cesarotti , Yotam Soreq , Matthew J. Strassler , Jesse Thaler , Wei Xue

Modifications to the distribution of charged particles with respect to high transverse momentum ($p_\mathrm{T}$) jets passing through a quark-gluon plasma are explored using the CMS detector. Back-to-back dijets are analyzed in lead-lead…

高能物理 - 实验 · 物理学 2021-05-20 CMS Collaboration

By using the theoretical approaches describing well the available data on $t$-integrated coherent photoproduction of light and heavy vector mesons in Pb-Pb ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) in Run 1, we…

高能物理 - 唯象学 · 物理学 2017-03-07 V. Guzey , M. Strikman , M. Zhalov

We introduce a generalized definition of parton distribution functions (PDFs) for a more consistent all-order treatment of power corrections. We present a new set of modified DGLAP evolution equations for nuclear PDFs, and show that the…

高能物理 - 唯象学 · 物理学 2008-11-26 Zhong-Bo Kang , Jian-Wei Qiu

We quantify the impact of unpolarized lepton-proton and lepton-nucleus inclusive deep-inelastic scattering (DIS) cross section measurements from the future Electron-Ion Collider (EIC) on the proton and nuclear parton distribution functions…

高能物理 - 唯象学 · 物理学 2021-05-19 Rabah Abdul Khalek , Jacob J. Ethier , Emanuele R. Nocera , Juan Rojo

We study the dependence of the transverse mass distribution of the charged lepton and the missing energies on the parton distributions (PDFs) adapted to the $W$ boson mass measurements at the CDF and ATLAS experiments. We compare the shape…

高能物理 - 唯象学 · 物理学 2022-05-10 Jun Gao , DianYu Liu , Keping Xie

Using the framework that interpolates between the leading power limit of the Color Glass Condensate and the High Energy (or $k_{T}$) factorization we calculate the direct component of the forward dijet production in ultra-peripheral…

高能物理 - 唯象学 · 物理学 2017-06-28 P. Kotko , K. Kutak , S. Sapeta , A. M. Stasto , M. Strikman

We extend the theory of leading twist nuclear shadowing to calculate leading twist nuclear diffractive parton distribution functions (nDPDFs). We observe that the quark and gluon nPDFs have different patterns of the $A$-dependence. It is…

高能物理 - 唯象学 · 物理学 2009-11-10 L. Frankfurt , V. Guzey , M. Strikman

We explore the potential of an Electron Ion Collider to determine nuclear modifications of PDFs. We find that gluon shadowing can be accurately measured down to x=0.001, and discuss the possibility of detecting non--linear QCD effects with…

高能物理 - 唯象学 · 物理学 2011-06-21 Alberto Accardi , Vadim Guzey , Juan Rojo

The recent measurement of the differential $ \gamma+c $-jet cross section, performed at the Tevatron collider in Run II by the D0 collaboration, is studied in a next-to-leading order (NLO) global QCD analysis to assess its impact on the…

高能物理 - 唯象学 · 物理学 2017-04-05 Alireza Aleedaneshvar , Muhammad Goharipour , Saeedeh Rostami

I report on our investigations into the impact of (un)polarized transverse momentum dependent parton distribution functions (TMD PDFs or TMDs) for gluons at hadron colliders, especially at A Fixed Target Experiment at the LHC (AFTER@LHC).…

高能物理 - 唯象学 · 物理学 2016-05-25 Andrea Signori

We present a new QCD analysis of parton distribution functions (PDFs) at the next-to-leading order (NLO) and next-to-next-to-leading order (NNLO). In the present paper, the role of special types of experimental measurements for extracting…

高能物理 - 唯象学 · 物理学 2024-05-20 Majid Azizi , Ali Khorramian , Saeid Paktinat Mehdiabadi

The $Q^2$ dependence of the ratios of nuclear structure functions $F_2^A$ is studied by performing QCD evolution of nuclear parton distribution functions. The log $Q^2$ slope of these ratios is very sensitive to the nuclear gluon…

高能物理 - 唯象学 · 物理学 2007-05-23 K. J. Eskola , H. Honkanen , V. J. Kolhinen , C. A. Salgado

We review the present status of the determination of parton distribution functions (PDFs) in the light of the precision requirements for the LHC in Run 2 and other future hadron colliders. We provide brief reviews of all currently available…

高能物理 - 唯象学 · 物理学 2016-09-21 A. Accardi , S. Alekhin , J. Blümlein , M. V. Garzelli , K. Lipka , W. Melnitchouk , S. Moch , R. Placakyte , J. F. Owens , E. Reya , N. Sato , A. Vogt , O. Zenaiev

We investigate the parton distribution function (PDF) uncertainty in the measurement of the effective weak mixing angle $\sin^2\theta_{\text{eff}}^{\ell}$ at the CERN Large Hadron Collider (LHC). The PDF-induced uncertainty is large in the…

高能物理 - 实验 · 物理学 2021-05-26 Yao Fu , Siqi Yang , Minghui Liu , Liang Han , Tie-Jiun Hou , Carl Schmidt , Chen Wang , C. -P. Yuan

The parton distribution functions (PDFs) of the proton play a role in determining the lineshape of $Z$ and $W$ bosons produced at the LHC. In particular, the mode of the gauge boson virtuality is shifted with respect to the pole due to the…

高能物理 - 实验 · 物理学 2020-04-27 Valerio Bertacchi , Lorenzo Bianchini , Elisabetta Manca , Gigi Rolandi , Suvankar Roy Chowdhury

In this talk, we present our recent next-to-leading order (NLO) nuclear parton distribution functions (nPDFs), which we call EPS09. As an extension to earlier NLO analyses, we supplement the deep inelastic scattering and Drell-Yan dilepton…

高能物理 - 唯象学 · 物理学 2009-11-18 Kari J. Eskola , Hannu Paukkunen , Carlos A. Salgado

The status of the global fits of nuclear parton distributions (nPDFs) is reviewed. In addition to comparing the contemporary analyses of nPDFs, difficulties and controversies posed by the neutrino-nucleus deeply inelastic scattering data is…

高能物理 - 唯象学 · 物理学 2015-06-18 Hannu Paukkunen

We reexamine the dominant contribution of parton distribution function (PDF) uncertainties to the W mass measurement, and determine their contribution is +-39(30) MeV when running the Large Hadron Collider at 7(13) TeV. We find that…

高能物理 - 唯象学 · 物理学 2015-08-19 Zack Sullivan , Seth Quackenbush

Understanding nuclear effects in parton distribution functions (PDF) is an essential component needed to determine the strange and anti-strange quark contributions in the proton. In addition Nuclear Parton Distribution Functions (NPDF) are…

高能物理 - 唯象学 · 物理学 2010-11-19 Karol Kovarik