Journal of High Energy Physics最新文献

{"title":"( mathcal{N} ) = 2 heterotic strings revisited","authors":"Amit Giveon,&nbsp;Akikazu Hashimoto,&nbsp;David Kutasov","doi":"10.1007/JHEP04(2025)006","DOIUrl":"10.1007/JHEP04(2025)006","url":null,"abstract":"<p>We show that 1 + 1 dimensional vacua of the (0<i>,</i> 2) heterotic string have many properties in common with more recently studied physical systems. The free theory exhibits a symmetric product CFT structure. The single-string Hilbert space splits into sectors labeled by the string winding, <i>w</i>, that contain purely left-moving (for <i>w &gt;</i> 0) and right-moving (for <i>w &lt;</i> 0) excitations. These sectors exhibit infinite-dimensional left and right-moving symmetry algebras, respectively, with central extensions that depend on <i>w</i>. String interactions between left and right-movers appear to lead to a <span>( Toverline{T} )</span> deformation of the free theory.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)006.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the negative coupling O(N) model in 2d at high temperature","authors":"Paul Romatschke","doi":"10.1007/JHEP04(2025)012","DOIUrl":"10.1007/JHEP04(2025)012","url":null,"abstract":"<p>In this work, I consider N-component scalar quantum field theory in two dimensions interacting with an upside-down quartic potential. Working in the large N limit, the model can be solved non-perturbatively using the saddle-point method for sufficiently strong negative coupling. At high temperature, the O(N) model dimensionally reduces to <span>( mathcal{PT} )</span>-symmetric quantum mechanics, for which powerful non-perturbative solution methods exist. It is found that the solution from quantum mechanics can be matched by the saddle-point method in quantum field theory when allowing for saddles beyond the principal Riemann sheet. I show that saddle points on non-principal Riemann sheets lead to a fully consistent solution of the 2d negative-coupling O(N) model for all temperatures.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)012.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Muon collider probes of Majorana neutrino dipole moments and masses","authors":"Michele Frigerio,&nbsp;Natascia Vignaroli","doi":"10.1007/JHEP04(2025)008","DOIUrl":"10.1007/JHEP04(2025)008","url":null,"abstract":"<p>Majorana neutrinos may have transitional dipole moments, which violate lepton number as well as lepton flavour. We estimate the sensitivity of future colliders to the electron-muon neutrino dipole moment, <i>λ</i>_<i>eμ</i>, by considering same-sign dilepton final states. We find that hadron colliders, even the proposed FCC-hh, are sensitive only to <i>|λ</i>_<i>eμ</i><i>|</i> ≳ 10⁻⁹<i>μ</i>_<i>B</i> (with <i>μ</i>_<i>B</i> the Bohr magneton), a value two-three orders of magnitude larger than current bounds from astrophysics and low-energy neutrino-scattering experiments. In the case of a future muon collider, we show that the sensitivity varies from <i>|λ</i>_<i>eμ</i><i>|</i> ~ 5 ∙ 10⁻⁹<i>μ</i>_<i>B</i> for energy <span>( sqrt{s} )</span> ≃ 3 TeV, to ∼ 10^<i>−</i>12<i>μ</i>_<i>B</i> for <span>( sqrt{s} )</span> ≃ 50 TeV, matching the current laboratory bounds for <span>( sqrt{s} )</span> ≃ 30 TeV. The singular advantage of the muon collider signal would be a direct, clean identification of lepton number and flavour violation. We also show that a muon collider would improve by orders of magnitude the direct bounds on <i>m</i>_<i>eμ</i> and <i>m</i>_<i>μμ</i>, two of the entries of the Majorana neutrino mass matrix. These bounds could be as strong as ∼ 50 keV, still far above the neutrino mass scale.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)008.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tetraquarks in the Born-Oppenheimer approximation","authors":"D. Germani,&nbsp;B. Grinstein,&nbsp;A. D. Polosa","doi":"10.1007/JHEP04(2025)004","DOIUrl":"10.1007/JHEP04(2025)004","url":null,"abstract":"<p>The conventional loosely bound molecule interpretation of the <i>X</i>(3872) is not compatible with the recent LHCb experimental measurement of the ratio of branching fractions <span>( mathcal{R} )</span> = Br(<i>X</i> → <i>ψ</i>′<i>γ</i>)<i>/</i>Br(<i>X</i> → <i>ψγ</i>). We systematically determine the entire tetraquark spectrum for <i>J</i> = 0<i>,</i> 1<i>,</i> 2 and refine the calculation of <span>( mathcal{R} )</span> in an improved Born-Oppenheimer description of the <i>X</i>(3872) compact tetraquark. This refinement yields a significantly better agreement with experimental data on <span>( mathcal{R} )</span> and on the spectroscopy of the states themselves. Extending the diquark-antidiquark paradigm to encompass tetraquarks that are linear super-positions of open charm singlets and color octets, we discover that these exotic resonances manifest as compact shallow bound states of quarks in color force potentials.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)004.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sterile-active resonance: A global qualitative picture","authors":"Mark Brettell,&nbsp;Ivan Martinez-Soler,&nbsp;Hisakazu Minakata","doi":"10.1007/JHEP04(2025)011","DOIUrl":"10.1007/JHEP04(2025)011","url":null,"abstract":"<p>In the <i>ν</i>SM extended by adding an eV-scale sterile state, the (3 + 1) model, the sterile-active level crossing entails the MSW resonance, here referred as the sterile-active (SA) resonance. In this paper, we construct an effective theory of SA resonance which involves only the sterile-active mixing angles and ∆<span>( {m}_{41}^2 )</span>, thanks to the given environment of high matter potential which freezes the <i>ν</i>SM oscillations. We give our first attempt at an analytic treatment of the effective theory to illuminate the global picture of the SA resonance at a glance. We formulate a perturbative framework in which the structure of “texture zeros” of the <i>S</i> matrix in the flavor space and the suppression by the small parameters sin <i>θ</i>_<i>j</i>4 (<i>j</i> = 1<i>,</i> 2<i>,</i> 3) allows us to reveal the flavor–event-type hierarchy of the resonance-effect strength in the probabilities. We have shown that the cascade events dominantly comes from the three paths through <i>P</i>(<i>ν</i>_<i>e</i> → <i>ν</i>_<i>e</i>), <i>P</i>(<span>( {overline{nu}}_e )</span> → <span>( {overline{nu}}_e )</span>), and <i>P</i>(<span>( {overline{nu}}_{mu } )</span> → <span>( {overline{nu}}_{tau } )</span>), and a three-component fit is suggested to disentangle the SA resonance generation mechanisms.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)011.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anatomy of the real Higgs triplet model","authors":"Saiyad Ashanujjaman,&nbsp;Sumit Banik,&nbsp;Guglielmo Coloretti,&nbsp;Andreas Crivellin,&nbsp;Siddharth P. Maharathy,&nbsp;Bruce Mellado","doi":"10.1007/JHEP04(2025)003","DOIUrl":"10.1007/JHEP04(2025)003","url":null,"abstract":"<p>In this article, we examine the Standard Model extended by a <i>Y</i> = 0 real Higgs triplet, the ∆SM. It contains a <i>CP</i>-even neutral Higgs (∆⁰) and two charged Higgs bosons (∆^<i>±</i>), which are quasi-degenerate in mass. We first study the theoretical constraints from vacuum stability and perturbative unitarity and then calculate the Higgs decays, including the loop-induced modes such as di-photons (<i>γγ</i>) and <i>Zγ</i>. In the limit of a small mixing between the SM Higgs and ∆⁰, the latter decays dominantly to <i>WW</i> and can have a sizable branching ratio to di-photon. The model predicts a positive definite shift in the <i>W</i> mass, which is compatible with the current global electroweak fit. At the Large Hadron Collider, it leads to a (<i>i</i>) stau-like signature from <i>pp</i> → ∆⁺∆^<i>−</i> → <span>( {tau}^{+}{tau}^{-}nu overline{nu} )</span>, (<i>ii</i>) multi-lepton final states from <i>pp</i> → <i>γ</i>^* → ∆⁺∆^<i>−</i> → <i>W</i>⁺<i>W</i>^<i>−</i><i>ZZ</i> and <i>pp</i> → <i>W</i>^* → ∆^<i>±</i>∆⁰ → <i>W</i>^<i>±</i><i>ZW</i>⁺<i>W</i>^<i>−</i> as well as (<i>iii</i>) associated di-photon production from <i>pp</i> → <i>W</i>^* → ∆^<i>±</i>(∆⁰ → <i>γγ</i>). Concerning (<i>i</i>), the reinterpretation of the recent supersymmetric tau partner search by ATLAS and CMS excludes <span>( {m}_{Delta ^{pm }} )</span> <i>&lt;</i> 110 GeV at 95% CL. From (<i>ii</i>), some of the signal regions of multi-lepton searches lead to bounds close to the predicted cross-section, but electroweak scale masses are still allowed. For (<i>iii</i>), the recast of the associated di-photon searches by ATLAS and a combined log-likelihood fit of signal and background to data find that out of the 25 signal regions, 10 provide relevant limits on Br(∆⁰ → <i>γγ</i>) at the per cent level. Interestingly, 6 signal regions show weaker than expected limits at around 152 GeV, leading to a preference for a non-zero di-photon branching ratio of about (0.7<i>±</i>0.2)%.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)003.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamics and DC conductivity of 2D anisotropic fluids from axion holography","authors":"Alfonso Ballon-Bayona,&nbsp;Jonathan P. Shock,&nbsp;Dimitrios Zoakos","doi":"10.1007/JHEP04(2025)002","DOIUrl":"10.1007/JHEP04(2025)002","url":null,"abstract":"<p>We investigate a strongly coupled finite-density anisotropic fluid in 2 + 1 dimensions dual to an asymptotically AdS black brane that is a solution of Einstein-Maxwell-Axion theory in 3 + 1 dimensions. Despite the anisotropy, the fluid thermodynamic properties align with those of a conformal fluid. Moreover, we show that the fluid is stable under the increase of the anisotropy parameter. Additionally, we analyse the DC conductivity of the anisotropic fluid, showing its compatibility with momentum dissipation due to translational symmetry breaking. In the limit of very large anisotropy we find that the DC conductivity vanishes as a consequence of dimensionality reduction. We also find that a metal-insulator transition arises driven by the anisotropy.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)002.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spinning dispersive CFT sum rules and bulk scattering","authors":"Cyuan-Han Chang,&nbsp;Yakov Landau,&nbsp;David Simmons-Duffin","doi":"10.1007/JHEP04(2025)016","DOIUrl":"10.1007/JHEP04(2025)016","url":null,"abstract":"<p>We use commutativity of null-integrated operators on the same null plane to construct dispersive CFT sum rules for spinning operators. The contribution of heavy blocks to these sum rules is dominated by a saddle configuration that we call the “scattering crystal.” Correlators in this configuration have a natural flat-space interpretation, which allows us to build a dictionary between dispersive CFT sum rules for stress-tensors and flat-space dispersion relations for gravitons. This dictionary is a crucial step for establishing the HPPS conjecture for stress tensor correlators.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)016.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Supernova bounds on new scalars from resonant and soft emission","authors":"Edward Hardy,&nbsp;Anton Sokolov,&nbsp;Henry Stubbs","doi":"10.1007/JHEP04(2025)013","DOIUrl":"10.1007/JHEP04(2025)013","url":null,"abstract":"<p>We study supernova cooling constraints on new light scalars that mix with the Higgs, couple only to nucleons, or couple only to leptons. We show that in all these cases scalars with masses smaller than the plasma frequency in the supernova core are efficiently produced by resonant mixing with the in-medium longitudinal degree of freedom of the photon. The resulting bounds are free from uncertainties associated to the rate of emission of the scalar in nucleon-nucleon scatterings, which would otherwise badly affect the Higgs-mixed and nucleophilic scenarios. Heavier scalars that mix with the Higgs or couple only to nucleons are mostly produced by nucleon bremsstrahlung, and we obtain a conservative approximation for the corresponding rate using a soft theorem. We also analyse the impact of different supernova profiles, nucleon degeneracy, trapping and scalar decays on the constraints.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)013.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Partially massless spin 2 and supersymmetry","authors":"Yu. M. Zinoviev","doi":"10.1007/JHEP04(2025)019","DOIUrl":"10.1007/JHEP04(2025)019","url":null,"abstract":"<p>The very existence of partially massless spin 2 supermultiplet tell us that partially massless spin 2 has two natural super-partners: massless spin 3/2 and massive spin 3/2 with some special value of mass. As for any pair of fields connected by global supertransformations there are two natural questions: existence of the self-interaction and possibility to make supertransformations to be local by switching their interaction with massless spin 3/2 gravitino. At first, we consider a self-interaction for the partially massless spin 2 and massive spin 3/2 which may be considered as the first approximation to partially massless supergravity and provide a direct construction of the minimal (i.e. having no more than one derivative) vertex which resembles usual supergravity. Then we consider localization of global supersymmetry which connects partially massless spin 2 with its two possible super-partners — massless spin 3/2 and massive with special mass value. For the first case we also managed to construct a minimal vertex having no more that one derivative. Again this vertex can be considered as a part of what can be called partially massless <i>N</i> = 2 supergravity. As for the second case, the corresponding vertex does exist but it has higher derivative terms.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)019.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}