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Short-Range Correlations Between Partons in a Proton
Jen-Chieh Peng, Krishna Rajagopal, John Terry
A principal lesson from recreating droplets of quark-gluon plasma (QGP) in heavy ion collisions is that it is a strongly coupled liquid, not a plasma of partons. The energy density…
Pion PDFs confronted by Fixed-Target Charmonium Production
Wen-Chen Chang, Chia-Yu Hsieh, Yu-Shiang Lian +3
The pion, as the Goldstone boson of the strong interaction, is the lightest QCD bound state and responsible for the long-range nucleon-nucleon interaction inside the nucleus. Our k…
Extraction of Kaon Partonic Distribution Functions from Drell-Yan and Production Data
Claude Bourrely, Franco Buccella, Wen-Chen Chang +1
We present an analysis to extract kaon parton distribution functions (PDFs) for the first time using meson-induced Drell-Yan and quarkonium production data. Starting from the stati…
Fixed-target charmonium production and pion parton distributions
Wen-Chen Chang, Jen-Chieh Peng, Stephane Platchkov +1
We investigate how charmonium hadroproduction at fixed-target energies can be used to constrain the gluon distribution in pions. Using nonrelativistic QCD (NRQCD) formulation, the…
Inverse Tritium Beta Decay with Relic Neutrinos, Solar Neutrinos, and a 51Cr Source
Jen-Chieh Peng, Gordon Baym
The inverse tritium beta decay (ITBD) reaction, H He, is a promising experimental tool for observing relic neutrinos created in the early Universe. This rea…
Pion Partonic Distributions in the Statistical Model from Pion-induced Drell-Yan and Production Data
Claude Bourrely, Wen-Chen Chang, Jen-Chieh Peng
We present a new analysis to extract pion parton distribution functions (PDFs) within the framework of the statistical model. Starting from the statistical model first developed fo…
NRQCD analysis of charmonium production with pion and proton beams at fixed-target energies
Chia-Yu Hsieh, Yu-Shiang Lian, Wen-Chen Chang +3
We present an analysis of hadroproduction of and at fixed-target energies in the framework of non-relativistic QCD (NRQCD). Using both pion- and proton-induced data,…
Evolution of Primordial Neutrino Helicities in Cosmic Gravitational Inhomogeneities
Gordon Baym, Jen-Chieh Peng
Relic neutrinos from the Big Bang decoupled from the hot plasma predominantly in helicity eigenstates. Their subsequent propagation through gravitational inhomogeneities of the Uni…
QCD effects in lepton angular distributions of Drell-Yan/ production and jet discrimination
Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng +1
We present a comparison of data of lepton angular distributions of Drell-Yan/ production with the fixed-order pQCD calculations by which the baseline of pQCD effects is illustra…
Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection
Gordon Baym, Jen-Chieh Peng
Since decoupling in the early universe in helicity states, primordial neutrinos propagating in astrophysical magnetic fields precess and undergo helicity changes. In view of the XE…
Lepton angular distribution of boson productions
Yang Lyu, Wen-Chen Chang, Randall Evan McClellan +2
The lepton angular distribution coefficients for boson production in and collisions have been measured at the LHC and the Tevatron. A recent study showed…
A New Extraction of Pion Parton Distributions in the Statistical Model
Claude Bourrely, Franco Buccella, Jen-Chieh Peng
We present a new analysis to extract pion's parton distribution functions (PDFs) in the framework of the statistical model. Starting from the statistical model framework first deve…
Constraining gluon density of pions at large by pion-induced production
Wen-Chen Chang, Jen-Chieh Peng, Stephane Platchkov +1
The gluon distributions of the pion obtained from various global fits exhibit large variations among them. Within the framework of the color evaporation model, we show that the exi…
Lepton angular distributions of Drell-Yan process in pQCD and a geometric approach
Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng +1
The lepton angular distributions of the Drell-Yan process in the fixed-target experiments are investigated by NLO and NNLO perturbative QCD. We present the calculated angular param…
Lepton angular distribution of Z boson production and jet discrimination
Jen-Chieh Peng, Wen-Chen Chang, Randall Evan McClellan +1
High precision data of lepton angular distributions in inclusive boson production, reported by the CMS and ATLAS Collaborations, showed pronounced transverse momentum () d…
Lepton angular distributions of fixed-target Drell-Yan experiments in perturbative QCD and a geometric approach
Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng +1
The lepton angular distributions of the Drell-Yan process in fixed-target experiments are investigated by NLO and NNLO perturbative QCD. We present the calculated angular parameter…
On the Rotational Invariance and Non-Invariance of Lepton Angular Distributions in Drell-Yan and Quarkonium Production
Jen-Chieh Peng, Daniel Boer, Wen-Chen Chang +2
Several rotational invariant quantities for the lepton angular distributions in Drell-Yan and quarkonium production were derived several years ago, allowing the comparison between…
Valence Quark and Gluon Distributions of Kaon from J/Psi Production
Jen-Chieh Peng, Wen-Chen Chang, Stephane Platchkov +1
The only experimental information on the parton distribution of kaons was obtained from the scarce kaon-induced Drell-Yan cross section data. From these data, evidence for a valenc…
Dependencies of Lepton Angular Distribution Coefficients on the Transverse Momentum and Rapidity of Bosons Produced in Collisions at LHC
Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng +1
High precision data of lepton angular distributions for production in collisions at the LHC, covering broad ranges of dilepton transverse momenta () and rapidity…
New analysis of tensor resonances measured at the COMPASS experiment
A. Jackura, C. Fernandez-Ramirez, M. Mikhasenko +232
We present a new amplitude analysis of the -wave in measured by COMPASS. Employing an analytical model based on the principles of the relativistic -mat…
Interpretation of Angular Distributions of -boson Production at Colliders
Jen-Chieh Peng, Wen-Chen Chang, Randall Evan McClellan +1
High precision data of dilepton angular distributions in production were reported recently by the CMS Collaboration covering a broad range of the dilepton transverse moment…
Transverse Spin Effects in Future Drell-Yan Experiments
Jen-Chieh Peng
We review the current status and future prospect for probing the transverse momentum dependent (TMD) parton distributions using the Drell-Yan process. We focus on the Boer-Mulders…
On the extraction of the intrinsic light-quark sea in the proton
Wen-Chen Chang, Jen-Chieh Peng
The HERMES collaboration recently reported a reevaluation of the strange-quark parton distribution, , based on kaon production in semi-inclusive deep-inelastic scattering. Tw…
The Flavor Structure of the Nucleon Sea
J. C. Peng, W. C. Chang, H. Y. Cheng +1
We discuss two topics related to the flavor structure of the nucleon sea. The first is on the identification of light-quark intrinsic sea from the comparison between recent data an…