A5030966539- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Superconducting Materials and Applications
- Noncommutative and Quantum Gravity Theories
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Spectral Theory in Mathematical Physics
- Advanced Operator Algebra Research
- Particle Detector Development and Performance
- Numerical methods in inverse problems
- Molecular spectroscopy and chirality
- Mathematical Analysis and Transform Methods
- Quantum Mechanics and Applications
- Quantum, superfluid, helium dynamics
- Adsorption, diffusion, and thermodynamic properties of materials
- Quantum Information and Cryptography
- Algebraic and Geometric Analysis
- Muon and positron interactions and applications
- Laser-induced spectroscopy and plasma
- Physics of Superconductivity and Magnetism
Duke University
2014-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2021
University of Arizona
2009-2021
Durham University
2017-2018
European Organization for Nuclear Research
2010
Thomas Jefferson National Accelerator Facility
2002-2007
Massachusetts Institute of Technology
2007
University of Washington
2005
The Ohio State University
2000-2002
California Institute of Technology
1998-2001
We consider pion interactions in an effective field theory of the narrow resonance $X(3872)$, assuming it is a weakly bound molecule charm mesons ${D}^{0}{\overline{D}}^{*0}$ and ${D}^{*0}{\overline{D}}^{0}$. Since hyperfine splitting ${D}^{0}$ ${D}^{*0}$ only 7 MeV greater than neutral mass, pions can be produced near threshold are nonrelativistic. show that exchange treated perturbation calculate next-to-leading-order correction to partial decay width...
Recently the Belle collaboration discovered two resonances, Zb(10610) and Zb(10650), that lie very close to B\bar{B}^* B^*\bar{B}^* thresholds, respectively. It is natural suppose these are molecular states of bottom anti-bottom mesons. Under this assumption, we introduce an effective field theory for as well similar unobserved expected on basis heavy quark spin symmetry. The molecules assumed arise from short-range interactions respect We use calculate line shapes in vicinity...
We use the open quantum system formalism to study dynamical in-medium evolution of quarkonium. The quarkonium is described by potential non-relativistic QCD while environment a weakly coupled quark-gluon plasma in local thermal equilibrium below melting temperature Under Markovian approximation, it shown that Lindblad equation leads Boltzmann transport if Wigner transform applied density matrix. Our derivation illuminates how microscopic time-reversibility consistent with time-irreversible...
The recently discovered tetraquark, ${T}_{cc}^{+}$, has quark content $cc\overline{u}\overline{d}$ and a mass that lies just below open charm thresholds. Hence it is reasonable to expect the state have significant molecular component. We calculate decay of ${T}_{cc}^{+}$ in interpretation using effective field theory. In addition we differential spectra as function invariant final meson pair. These are good agreement with measured by LHCb. also point out if shallow bound states two...
We study quarkonium transport in the quark-gluon plasma by using potential nonrelativistic QCD (pNRQCD) effective field theory and framework of open quantum systems. argue that coupling between thermal bath is weak separation scales, so initial density matrix total system factorizes time evolution subsystem Markovian. derive semiclassical Boltzmann equation for applying a Wigner transform to Lindblad carrying out expansion. resum relevant interactions all orders constant at leading power...
We study low-energy scattering of spin-1/2 baryons from the perspective quantum information science, focusing on correlation between entanglement minimization and appearance accidental symmetries. The baryon transforms as an octet under SU(3) flavor symmetry its interactions below pion threshold are described by contact operators in effective field theory (EFT) QCD. Despite there being 64 channels 2-to-2 scattering, only six independent EFT predicted SU(3). show that successive...
The ${T}_{cc}^{+}$ exotic meson, discovered by the LHCb Collaboration in 2021, can be interpreted as a molecular state of ${D}^{(*)0}$ and ${D}^{(*)+}$ mesons. We compute next-to-leading-order (NLO) contributions to strong decay an effective field theory for $D$ mesons pions, considering from one-pion exchange final-state rescattering. Corrections total width, well differential distribution invariant mass $D$-meson pair are computed. results remain good agreement with experimental when NLO...
We construct a chiral Lagrangian for doubly heavy baryons and mesons that is invariant under quark-diquark symmetry at leading order includes the $O(1/{m}_{Q})$ violating operators. The theory used to predict electromagnetic decay width of $J=\frac{3}{2}$ member ground state baryon doublet. Numerical estimates are provided charm baryons. also calculate corrections masses strong widths low lying excited
We give heavy quark-diquark symmetry predictions for doubly baryons and tetraquarks in light of the recent discovery $\Xi_{cc}^{++}$ by LHCb. For five excited charm that are predicted to lie below $\Lambda_c D$ threshold, we their electromagnetic strong decays using a previously developed chiral Lagrangian with symmetry. Based on mass $\Xi_{cc}^{++}$, existence bottom $I=0$ tetraquark is stable has been predicted. If this state 10405 MeV, as some models, argue $J^P=1^+$ $I=1$ will just open...
Symmetry is among the most fundamental and powerful concepts in nature, whose existence usually taken as given, without explanation. We explore whether symmetry can be derived from more principles perspective of quantum information. Starting with a two-qubit system, we show there are only two minimally entangling logic gates: identity $\mathrm{SWAP}$, which interchanges states qubits. further demonstrate that, when viewed an entanglement operator spin-space, $S$-matrix two-body scattering...
We study a dilute Bose gas of atoms whose scattering length $a$ is large compared to the range their interaction. calculate energy density $E$ homogeneous Bose-Einstein condensate (BEC) second order in low-density expansion, expressing it terms and parameter ${\ensuremath{\Lambda}}_{*}$ that determines low-energy observables three-body sector. The second-order correction has small imaginary part reflects instability due recombination. In case trapped BEC with negative $a$, we coefficient...
The decays of the $X(3872)$ to $P$-wave quarkonia are calculated under assumption that it is a shallow bound state neutral charmed mesons. described using an effective theory nonrelativistic $D$ mesons and pions (X-EFT). We calculate by first matching heavy hadron chiral perturbation ($\mathrm{HH}\ensuremath{\chi}\mathrm{PT}$) amplitudes for ${D}^{0}{\overline{D}}^{*0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{cJ}({\ensuremath{\pi}}^{0},\ensuremath{\pi}\ensuremath{\pi})$ onto local...
We introduce the transverse momentum dependent fragmenting jet function (TMDFJF), which appears in factorization theorems for cross sections jets with an identified hadron. These are functions of z, hadron’s longitudinal fraction, and momentum, p ⊥, relative to axis. In framework Soft-Collinear Effective Theory (SCET) we derive TMDFJF from both a factorized SCET section TMD fragmentation defined literature. The TMDFJFs into distinct collinear soft-collinear modes by matching onto SCET+. As...
We analyze the recent LHCb measurement of distribution fraction transverse momentum, $z(J/\psi)$, carried by $J/\psi$ within a jet. data is compared to analytic calculations using fragmenting jet function (FJF) formalism for studying in jets. Logarithms FJFs are resummed DGLAP evolution. also convolve hard QCD partonic cross sections, showered with PYTHIA, leading order Non Relativistic Quantum Chromodynamics (NRQCD) fragmentation functions and obtain consistent results. Both approaches use...
In this work we apply effective field theory (EFT) to observables in quarkonium production and decay that are sensitive soft gluon radiation, particular measurements small transverse momentum. Within the EFT framework study $\chi_Q$ light quarks followed by fragmentation of those hadrons. We derive a factorization theorem involves momentum distribution (TMD) functions new TMD shape functions. renormalization group equations, both rapidity virtuality, which used evolve different terms resum...
We calculate the matching, at leading order, of transverse momentum-dependent fragmentation functions (TMDFFs) for light quarks and gluons fragmenting to a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:math> onto polarized nonrelativistic QCD (NRQCD) TMDFFs. The NRQCD TMDFFs have an operator product expansion in terms nonperturbative production matrix elements. Using results we obtain, make predictions quark contribution...
We compare the relative importance of different mechanisms for polarized <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:math> production in semi-inclusive deep inelastic scattering processes at large <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>Q</c:mi><c:mn>2</c:mn></c:msup></c:math>. The transverse momentum dependent (TMD) factorization framework and nonrelativistic quantum...
We note that in the limit where NN 1S0 and 3S1 scattering lengths, a^(1S0) a^(3S1), go to infinity, leading terms effective field theory for strong interactions are invariant under Wigner's SU(4) spin-isospin symmetry. This explains why effects of radiation pions on S-wave amplitudes vanish as a^(3S1) infinity. The implications Wigner symmetry axion gamma d n p also considered.
Recent observations of the spectrum J/psi produced in e+ e- collisions at Upsilon(4S) resonance are conflict with fixed-order calculations using Non-Relativistic QCD (NRQCD) effective field theory. One problem is that leading order color-octet mechanisms predict an enhancement cross section for maximal energy not observed data. However, this region phase space large perturbative corrections (Sudakov logarithms) as well enhanced nonperturbative effects important. In paper we use newly...