Physical Review D最新文献

{"title":"Black holes and naked singularities in four dimensional dS and AdS Chamseddine gravity","authors":"B. Cvetković, D. Simić","doi":"10.1103/physrevd.111.044059","DOIUrl":"https://doi.org/10.1103/physrevd.111.044059","url":null,"abstract":"We analyze solutions of Chamseddine’s topological gravity in four-dimensional spacetime and discover various black hole solutions, with and without torsion, as well as solutions that describe naked singularities. Since all the solutions belong to the sector with vanishing scalar fields, they share the peculiar trait that all conserved charges are zero. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"117 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143462108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Helicity amplitudes in massless QED to higher orders in the dimensional regulator","authors":"Thomas Dave, William J. Torres Bobadilla","doi":"10.1103/physrevd.111.036024","DOIUrl":"https://doi.org/10.1103/physrevd.111.036024","url":null,"abstract":"We analytically calculate one- and two-loop helicity amplitudes in massless QED, by adopting a four-dimensional tensor decomposition. We draw our attention to four-fermion and Compton scattering processes to higher orders in the dimensional regulator, as required for theoretical predictions at N</a:mi>3</a:mn></a:msup>LO</a:mi></a:math>. We organize loop amplitudes by proposing an efficient algorithm at integrand level to group Feynman graphs into integral families. We study the singular structure of these amplitudes and discuss the correspondence between QED and QCD processes. We present our results in terms of generalized polylogarithms up to transcendental weight six. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"25 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143462109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"μ−→e−γ in a muonic atom as a probe for effective lepton-flavor-violating operators involving photon fields","authors":"Yuichi Uesaka, Masato Yamanaka, Yoshitaka Kuno","doi":"10.1103/physrevd.111.035017","DOIUrl":"https://doi.org/10.1103/physrevd.111.035017","url":null,"abstract":"We propose the μ</a:mi>−</a:mo></a:msup>→</a:mo>e</a:mi>−</a:mo></a:msup>γ</a:mi></a:math> process in a muonic atom as a novel means to investigate charged lepton flavor violation (CLFV). We demonstrate its sensitivity in probing effective CLFV operators associated with both single and double photon fields. In comparison to <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><d:msup><d:mi>μ</d:mi><d:mo>+</d:mo></d:msup><d:mo stretchy=\"false\">→</d:mo><d:msup><d:mi>e</d:mi><d:mo>+</d:mo></d:msup><d:mi>γ</d:mi></d:math> using free positive muon decays at rest, the emitted electron and photon in <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:msup><g:mi>μ</g:mi><g:mo>−</g:mo></g:msup><g:mo stretchy=\"false\">→</g:mo><g:msup><g:mi>e</g:mi><g:mo>−</g:mo></g:msup><g:mi>γ</g:mi></g:math> exhibit nonmonochromatic spectra, presenting nontrivial case. We derive the decay rate formula and demonstrate that the potential rate of the process is significant enough to motivate exploration in future muon CLFV experiments. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"47 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"More on scattering processes of dressed particles with a time-dependent mass","authors":"Yusuke Yamada","doi":"10.1103/physrevd.111.045021","DOIUrl":"https://doi.org/10.1103/physrevd.111.045021","url":null,"abstract":"We discuss the scattering process of a scalar field having a time-dependent mass with another scalar field having a constant mass as a toy model of the scattering problems during preheating after inflation. Despite a general difficulty of analytically solving such models, in our previous work [QFT approach to dressed particle processes in preheating and non-perturbative mechanism in kinematically-forbidden regime, ], we considered an exactly calculable model of such scattering processes with a time-dependent mass of the form m</a:mi></a:mrow>2</a:mn></a:mrow></a:msup>(</a:mo>t</a:mi>)</a:mo>⊃</a:mo>μ</a:mi></a:mrow>4</a:mn></a:mrow></a:msup>t</a:mi></a:mrow>2</a:mn></a:mrow></a:msup></a:mrow></a:math> and the time-dependence never disappears formally. In this work, we discuss another exactly calculable model with a time-dependent mass that has a spike/peak but asymptotes to a constant, which effectively appears in the preheating model of Higgs inflation with a nonminimal coupling. Thanks to the localized time-dependence of the mass, the daughter particle number density behaves in a physically reasonable way contrary to the one in our previous model due to the infinite time-dependent mass in the asymptotic future. On the other hand, we find that the daughter particle experiences the kinematically forbidden process, which is a nonperturbative phenomenon found in our previous work. As in the previous model, the kinematically forbidden process produces daughter particles exponentially more than the parent particle having the time-dependent mass, which never happens for particle decay processes without time-dependent backgrounds. This result supports the existence of such a nonperturbative particle production process in general time-dependent backgrounds. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"81 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing entanglement and Bell inequality violation in top antitop events","authors":"Kun Cheng, Tao Han, Matthew Low","doi":"10.1103/physrevd.111.033004","DOIUrl":"https://doi.org/10.1103/physrevd.111.033004","url":null,"abstract":"A top quark and an antitop quark produced together at colliders have correlated spins. These spins constitute a quantum state that can exhibit entanglement and violate Bell’s inequality. In realistic collider experiments, most analyses allow the axes, as well the Lorentz frame, to vary event by event, thus introducing a dependence on the choice of event-dependent basis leading us to adopt “fictitious states,” rather than genuine quantum states. The basis dependence of fictitious states allows for an optimization procedure, which makes the usage of fictitious states advantageous in measuring entanglement and Bell inequality violation. In this work, we show analytically that the basis that diagonalizes the spin-spin correlations is optimal for maximizing spin correlations, entanglement, and Bell inequality violation. We show that the optimal basis is approximately the same as the fixed beam basis (or the rotated beam basis) near the t</a:mi>t</a:mi>¯</a:mo></a:mover></a:math> production threshold, while it approaches the helicity basis far above threshold. Using this basis, we present the sensitivity for entanglement and Bell inequality violation in <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mi>t</e:mi><e:mover accent=\"true\"><e:mi>t</e:mi><e:mo stretchy=\"false\">¯</e:mo></e:mover></e:math> events at the Large Hadron Collider (LHC) and a future <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:msup><i:mi>e</i:mi><i:mo>+</i:mo></i:msup><i:msup><i:mi>e</i:mi><i:mo>−</i:mo></i:msup></i:math> collider. Since observing Bell inequality violation appears to be quite challenging experimentally, and requires a large dataset in collider experiments, choosing the optimal basis is crucially important to observe Bell inequality violation. Our method and general approach are equally applicable to other systems beyond <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:mi>t</k:mi><k:mover accent=\"true\"><k:mi>t</k:mi><k:mo stretchy=\"false\">¯</k:mo></k:mover></k:math>, including interactions beyond the Standard Model. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"35 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143452003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gravitational wave forms for extreme mass ratio collisions from supersymmetric gauge theories","authors":"Francesco Fucito, Jose Francisco Morales, Rodolfo Russo","doi":"10.1103/physrevd.111.044054","DOIUrl":"https://doi.org/10.1103/physrevd.111.044054","url":null,"abstract":"We study the wave form emitted by a particle moving along an arbitrary (in general open) geodesic of the Schwarzschild geometry. The mathematical problem can be phrased in terms of quantities in N</a:mi>=</a:mo>2</a:mn></a:math> supersymmetric gauge theories that can be calculated by using localization and the Alday-Gaiotto-Tachikawa correspondence. In particular through this mapping, the post-Newtonian expansion of the wave form is expressed as a double instanton sum with rational coefficients that resums all tail contributions into Gamma functions and exponentials. The formulas we obtain are valid for generic values of the orbital quantum numbers <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><d:mo>ℓ</d:mo></d:math> and <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><f:mi>m</f:mi></f:math>. For <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><h:mo>ℓ</h:mo><h:mo>=</h:mo><h:mn>2</h:mn></h:math>, 3 we check explicitly that our results agree with the small mass ratio limit of the wave forms derived in the multipole post-Minkowskian and the amplitudes approaches. We show how the so-called tails and tails-of-tails contributions to the wave form arise in our approach. Finally, we derive a universal formula for the soft limit of the wave form that resums all logarithmic terms of the form <j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><j:msup><j:mi>ω</j:mi><j:mrow><j:mi>n</j:mi><j:mo>−</j:mo><j:mn>1</j:mn></j:mrow></j:msup><j:mo stretchy=\"false\">(</j:mo><j:mi>log</j:mi><j:mi>ω</j:mi><j:msup><j:mo stretchy=\"false\">)</j:mo><j:mi>n</j:mi></j:msup></j:math>. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"139 9 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Axion minicluster halo limits from wide binary disruption","authors":"Zihang Wang, Yu Gao","doi":"10.1103/physrevd.111.043042","DOIUrl":"https://doi.org/10.1103/physrevd.111.043042","url":null,"abstract":"Axionic dark matter can form miniclusters and minicluster halos (MCHs) from inhomogeneities in the early Universe. If MCHs are sufficiently massive, then their existence can be revealed by small-scale gravitational tidal perturbation to halolike wide binary star systems in the Galaxy. The observed population of the Milky Way’s wide-separation binaries with a</a:mi>≳</a:mo>0.1</a:mn></a:math> parsec offer a sensitive test to dynamic evaporation from MCHs. Considering data from recent GAIA observations, we derive significant constraints on the MCH fraction of the Galactic dark matter halo. For several scenarios including dense MCHs and isolated minicluster models, these limits will apply to axionlike particles in the mass range <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mrow><c:msub><c:mrow><c:mi>m</c:mi></c:mrow><c:mrow><c:mi>a</c:mi></c:mrow></c:msub><c:mo>∼</c:mo><c:msup><c:mrow><c:mn>10</c:mn></c:mrow><c:mrow><c:mo>−</c:mo><c:mn>15</c:mn></c:mrow></c:msup><c:mi>–</c:mi><c:msup><c:mrow><c:mn>10</c:mn></c:mrow><c:mrow><c:mo>−</c:mo><c:mn>12</c:mn></c:mrow></c:msup><c:mtext> </c:mtext><c:mtext> </c:mtext><c:mi>eV</c:mi></c:mrow></c:math> and <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mrow><e:msub><e:mrow><e:mi>m</e:mi></e:mrow><e:mrow><e:mi>a</e:mi></e:mrow></e:msub><e:mo>∼</e:mo><e:msup><e:mrow><e:mn>10</e:mn></e:mrow><e:mrow><e:mo>−</e:mo><e:mn>19</e:mn></e:mrow></e:msup><e:mi>–</e:mi><e:msup><e:mrow><e:mn>10</e:mn></e:mrow><e:mrow><e:mo>−</e:mo><e:mn>16</e:mn></e:mrow></e:msup><e:mtext> </e:mtext><e:mtext> </e:mtext><e:mi>eV</e:mi></e:mrow></e:math>, respectively. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"2 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Doubly charm tetraquark channel with isospin 1 from lattice QCD","authors":"Lu Meng, Emmanuel Ortiz-Pacheco, Vadim Baru, Evgeny Epelbaum, M. Padmanath, Sasa Prelovsek","doi":"10.1103/physrevd.111.034509","DOIUrl":"https://doi.org/10.1103/physrevd.111.034509","url":null,"abstract":"Experimentally, the doubly charm tetraquark channel c&lt;/a:mi&gt;c&lt;/a:mi&gt;q&lt;/a:mi&gt;¯&lt;/a:mo&gt;&lt;/a:mover&gt;q&lt;/a:mi&gt;¯&lt;/a:mo&gt;&lt;/a:mover&gt;&lt;/a:math&gt; with &lt;g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;g:mrow&gt;&lt;g:mi&gt;q&lt;/g:mi&gt;&lt;g:mo&gt;=&lt;/g:mo&gt;&lt;g:mi&gt;u&lt;/g:mi&gt;&lt;/g:mrow&gt;&lt;/g:math&gt;, &lt;i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;i:mrow&gt;&lt;i:mi&gt;d&lt;/i:mi&gt;&lt;/i:mrow&gt;&lt;/i:math&gt; features an exotic hadron, &lt;k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;k:msub&gt;&lt;k:mi&gt;T&lt;/k:mi&gt;&lt;k:mrow&gt;&lt;k:mi&gt;c&lt;/k:mi&gt;&lt;k:mi&gt;c&lt;/k:mi&gt;&lt;/k:mrow&gt;&lt;/k:msub&gt;&lt;/k:math&gt;, with isospin &lt;m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;m:mi&gt;I&lt;/m:mi&gt;&lt;m:mo&gt;=&lt;/m:mo&gt;&lt;m:mn&gt;0&lt;/m:mn&gt;&lt;/m:math&gt; near the &lt;o:math xmlns:o=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;o:mi&gt;D&lt;/o:mi&gt;&lt;o:msup&gt;&lt;o:mi&gt;D&lt;/o:mi&gt;&lt;o:mo&gt;*&lt;/o:mo&gt;&lt;/o:msup&gt;&lt;/o:math&gt; threshold, while no peak was observed for &lt;q:math xmlns:q=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;q:mi&gt;I&lt;/q:mi&gt;&lt;q:mo&gt;=&lt;/q:mo&gt;&lt;q:mn&gt;1&lt;/q:mn&gt;&lt;/q:math&gt;. We present a lattice QCD study of this channel with &lt;s:math xmlns:s=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;s:mi&gt;I&lt;/s:mi&gt;&lt;s:mo&gt;=&lt;/s:mo&gt;&lt;s:mn&gt;1&lt;/s:mn&gt;&lt;/s:math&gt;, &lt;u:math xmlns:u=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;u:msup&gt;&lt;u:mi&gt;J&lt;/u:mi&gt;&lt;u:mi&gt;P&lt;/u:mi&gt;&lt;/u:msup&gt;&lt;u:mo&gt;=&lt;/u:mo&gt;&lt;u:msup&gt;&lt;u:mn&gt;1&lt;/u:mn&gt;&lt;u:mo&gt;+&lt;/u:mo&gt;&lt;/u:msup&gt;&lt;/u:math&gt;, and &lt;w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;w:msub&gt;&lt;w:mi&gt;m&lt;/w:mi&gt;&lt;w:mi&gt;π&lt;/w:mi&gt;&lt;/w:msub&gt;&lt;w:mo&gt;≃&lt;/w:mo&gt;&lt;w:mn&gt;280&lt;/w:mn&gt;&lt;w:mtext&gt; &lt;/w:mtext&gt;&lt;w:mtext&gt; &lt;/w:mtext&gt;&lt;w:mi&gt;MeV&lt;/w:mi&gt;&lt;/w:math&gt;. Finite-volume energies calculated across five charm quark masses consistently feature a positive energy shift with respect to noninteracting energies, indicating repulsive interaction at energies near the threshold. These energies are used to compute the &lt;y:math xmlns:y=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;y:mi&gt;D&lt;/y:mi&gt;&lt;y:msup&gt;&lt;y:mi&gt;D&lt;/y:mi&gt;&lt;y:mo&gt;*&lt;/y:mo&gt;&lt;/y:msup&gt;&lt;/y:math&gt; scattering amplitude using both the standard Lüscher method and the recently proposed effective field theory-based approach in the plane wave basis, which incorporates the long-range interactions and the left-hand cut. Both analyses render a small negative scattering length and a scattering amplitude that does not feature any poles in the energy region near the D&lt;/ab:mi&gt;D&lt;/ab:mi&gt;*&lt;/ab:mo&gt;&lt;/ab:msup&gt;&lt;/ab:math&gt; threshold, in line with the LHCb results. We identify that the Wick contraction, resembling &lt;cb:math xmlns:cb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;cb:mi&gt;t&lt;/cb:mi&gt;&lt;/cb:math&gt;-channel isovector-vector meson exchanges between &lt;eb:math xmlns:eb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;eb:mi&gt;D&lt;/eb:mi&gt;&lt;/eb:math&gt; and &lt;gb:math xmlns:gb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;gb:msup&gt;&lt;gb:mi&gt;D&lt;/gb:mi&gt;&lt;gb:mo&gt;*&lt;/gb:mo&gt;&lt;/gb:msup&gt;&lt;/gb:math&gt;, plays a key role in distinguishing between the &lt;ib:math xmlns:ib=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;ib","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"4 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of π0 , KS0 , and η fragmentation functions using single-inclusive annihilation data including BESIII measurements","authors":"Mengyang Li, Daniele Paolo Anderle, Hongxi Xing, Yuxiang Zhao","doi":"10.1103/physrevd.111.034030","DOIUrl":"https://doi.org/10.1103/physrevd.111.034030","url":null,"abstract":"This study presents a quantum chromodynamics (QCD) analysis of fragmentation functions (FFs) for neutral pions (π</a:mi>0</a:mn></a:msup></a:math>), neutral kaons (<c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup></c:math>), and eta mesons (<e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mi>η</e:mi></e:math>), utilizing world data of single-inclusive hadron production in <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:msup><g:mi>e</g:mi><g:mo>+</g:mo></g:msup><g:msup><g:mi>e</g:mi><g:mo>−</g:mo></g:msup></g:math> annihilation involving the most recent BESIII data with low collision energy, to test the operational region of QCD collinear factorization for single-inclusive hadron production. We found that the QCD-based analysis at next-to-next-to-leading order in perturbative QCD with parametrized higher-twist effects can explain both existing high-energy world data and the BESIII new measurements, while the latter cannot be explained with existing FFs extracted with high-energy data. To investigate the higher-twist contributions to this discrepancy, a direct functional approach is employed, providing a testing framework for characterizing the experimental results over a wide range of energy scales, from low to high, thus extending the classical theoretical models to the BESIII domain. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"130 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NLO EW corrections to tau pair production via photon fusion in Pb-Pb ultraperipheral collisions","authors":"Jun Jiang, Peng-Cheng Lu, Zong-Guo Si, Han Zhang, Xin-Yi Zhang","doi":"10.1103/physrevd.111.036023","DOIUrl":"https://doi.org/10.1103/physrevd.111.036023","url":null,"abstract":"We study the next-to-leading order (NLO) electroweak (EW) corrections to the γ&lt;/a:mi&gt;γ&lt;/a:mi&gt;→&lt;/a:mo&gt;τ&lt;/a:mi&gt;&lt;/a:mrow&gt;+&lt;/a:mo&gt;&lt;/a:mrow&gt;&lt;/a:msup&gt;τ&lt;/a:mi&gt;&lt;/a:mrow&gt;−&lt;/a:mo&gt;&lt;/a:mrow&gt;&lt;/a:msup&gt;&lt;/a:mrow&gt;&lt;/a:math&gt; process in a Pb-Pb ultraperipheral collision (UPC). We find that the EW correction &lt;d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;d:mi&gt;δ&lt;/d:mi&gt;&lt;d:msub&gt;&lt;d:mi&gt;σ&lt;/d:mi&gt;&lt;d:mi&gt;EW&lt;/d:mi&gt;&lt;/d:msub&gt;&lt;/d:math&gt; decreases the total cross section &lt;f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;f:mrow&gt;&lt;f:msub&gt;&lt;f:mrow&gt;&lt;f:mi&gt;σ&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;f:mrow&gt;&lt;f:mi&gt;NLO&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;/f:msub&gt;&lt;f:mo&gt;=&lt;/f:mo&gt;&lt;f:msub&gt;&lt;f:mrow&gt;&lt;f:mi&gt;σ&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;f:mrow&gt;&lt;f:mi&gt;LO&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;/f:msub&gt;&lt;f:mo&gt;+&lt;/f:mo&gt;&lt;f:mi&gt;δ&lt;/f:mi&gt;&lt;f:msub&gt;&lt;f:mrow&gt;&lt;f:mi&gt;σ&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;f:mrow&gt;&lt;f:mi&gt;EW&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;/f:msub&gt;&lt;/f:mrow&gt;&lt;/f:math&gt; by &lt;h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;h:mrow&gt;&lt;h:mo&gt;−&lt;/h:mo&gt;&lt;h:mn&gt;3&lt;/h:mn&gt;&lt;h:mo&gt;%&lt;/h:mo&gt;&lt;/h:mrow&gt;&lt;/h:math&gt; at Pb-Pb center-of-mass energy &lt;j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;j:msqrt&gt;&lt;j:msub&gt;&lt;j:mi&gt;s&lt;/j:mi&gt;&lt;j:mrow&gt;&lt;j:mi&gt;N&lt;/j:mi&gt;&lt;j:mi&gt;N&lt;/j:mi&gt;&lt;/j:mrow&gt;&lt;/j:msub&gt;&lt;/j:msqrt&gt;&lt;j:mo&gt;=&lt;/j:mo&gt;&lt;j:mn&gt;5.02&lt;/j:mn&gt;&lt;j:mtext&gt; &lt;/j:mtext&gt;&lt;j:mtext&gt; &lt;/j:mtext&gt;&lt;j:mi&gt;TeV&lt;/j:mi&gt;&lt;/j:math&gt;. The weak correction plays a significant role whose contribution is about–4 times that of QED. The CMS and ATLAS Collaborations use the reaction &lt;l:math xmlns:l=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;l:mi&gt;γ&lt;/l:mi&gt;&lt;l:mi&gt;γ&lt;/l:mi&gt;&lt;l:mo stretchy=\"false\"&gt;→&lt;/l:mo&gt;&lt;l:msup&gt;&lt;l:mi&gt;τ&lt;/l:mi&gt;&lt;l:mo&gt;+&lt;/l:mo&gt;&lt;/l:msup&gt;&lt;l:msup&gt;&lt;l:mi&gt;τ&lt;/l:mi&gt;&lt;l:mo&gt;−&lt;/l:mo&gt;&lt;/l:msup&gt;&lt;/l:math&gt; in Pb-Pb and proton-proton UPCs to constrain tau’s anomalous magnetic moment &lt;o:math xmlns:o=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;o:msub&gt;&lt;o:mi&gt;a&lt;/o:mi&gt;&lt;o:mi&gt;τ&lt;/o:mi&gt;&lt;/o:msub&gt;&lt;/o:math&gt;. By parametrizing the &lt;q:math xmlns:q=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;q:mi&gt;γ&lt;/q:mi&gt;&lt;q:mi&gt;τ&lt;/q:mi&gt;&lt;q:mi&gt;τ&lt;/q:mi&gt;&lt;/q:math&gt; vertex with two form factors &lt;s:math xmlns:s=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;s:msub&gt;&lt;s:mi&gt;F&lt;/s:mi&gt;&lt;s:mrow&gt;&lt;s:mn&gt;1&lt;/s:mn&gt;&lt;s:mo&gt;,&lt;/s:mo&gt;&lt;s:mn&gt;2&lt;/s:mn&gt;&lt;/s:mrow&gt;&lt;/s:msub&gt;&lt;/s:math&gt;, the cross section can be written as &lt;u:math xmlns:u=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;u:msub&gt;&lt;u:mi&gt;σ&lt;/u:mi&gt;&lt;u:msub&gt;&lt;u:mi&gt;a&lt;/u:mi&gt;&lt;u:mi&gt;τ&lt;/u:mi&gt;&lt;/u:msub&gt;&lt;/u:msub&gt;&lt;u:mo&gt;=&lt;/u:mo&gt;&lt;u:msub&gt;&lt;u:mi&gt;σ&lt;/u:mi&gt;&lt;u:mi&gt;LO&lt;/u:mi&gt;&lt;/u:msub&gt;&lt;u:mo&gt;+&lt;/u:mo&gt;&lt;u:mi&gt;δ&lt;/u:mi&gt;&lt;u:msub&gt;&lt;u:mi&gt;σ&lt;/u:mi&gt;&lt;u:msub&gt;&lt;u:mi&gt;a&lt;/u:mi&gt;&lt;u:mi&gt;τ&lt;/u:mi&gt;&lt;/u:msub&gt;&lt;/u:msub&gt;&lt;/u:math&gt;, where &lt;w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;w:mi&gt;δ&lt;/w:mi&gt;&lt;w:msub&gt;&lt;w:mi&gt;σ&lt;/w:mi&gt;&lt;w:msub&gt;&lt;w:mi&gt;a&lt;/w:mi&gt;&lt;w:mi&gt;τ&lt;/w:mi&gt;&lt;/w:msub&gt;&lt;/w:msub&gt;&lt;/w:math&gt; is proportional to &lt;y:math xmlns:y=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;y:msub&gt;&lt;y:mi&gt;a&lt;/y:mi&gt;&lt;y:mi&gt;τ&lt;/y:mi&gt;&lt;/y:msub&gt;&lt;/y:math&gt;. The impact of NLO EW corrections on a&lt;/ab:mi&gt;τ&lt;/ab:mi&gt;&lt;/ab:msub&gt;&lt;/ab:math&gt; bounds in a Pb-Pb UPC is limited, as the current ","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"62 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}