Haipeng An, Zhehan Qin, Zhong-Zhi Xianyu, Borui Zhang
{"title":"Primordial stochastic gravitational waves from massive higher-spin bosons","authors":"Haipeng An, Zhehan Qin, Zhong-Zhi Xianyu, Borui Zhang","doi":"10.1007/JHEP09(2025)203","DOIUrl":"10.1007/JHEP09(2025)203","url":null,"abstract":"<p>Can a stationary stone radiate gravitational waves (GWs)? While the answer is typically “no” in flat spacetime, we get a “yes” in inflationary spacetime. In this work, we study the stationary-stone-produced GWs in inflation with a concrete model, where the role of stones is played by massive higher-spin particles. We study particles of spin-2 and higher produced by helical chemical potentials, and show that the induced GWs feature a scale-invariant and helicity-biased power spectrum in the slow-roll limit. Including slow-roll corrections leads to interesting backreactions from the higher-spin boson production, resulting in an intriguing scale-dependence of GWs at small scales. Given the existing observational and theoretical constraints, we identify viable parameter regions capable of generating visibly large GWs for future observations.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)203.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144806","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}
Jeffrey R. Forshaw, Simon Plätzer, Fernando Torre González
{"title":"Fully differential soft gluon evolution at the amplitude level","authors":"Jeffrey R. Forshaw, Simon Plätzer, Fernando Torre González","doi":"10.1007/JHEP09(2025)207","DOIUrl":"10.1007/JHEP09(2025)207","url":null,"abstract":"<p>We study differential intra-jet radiation patterns in jet production at full colour. We present a systematic study of several QCD 2 → 2 processes and also multi-jet production from a colourless initial state. We examine how subleading colour corrections are distributed differentially in phase space and find that mere normalization effects due to subleading colour can be due to subtle cancellations across phase space. In general, we find that subleading colour does affect the shapes of distributions.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)207.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144807","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":"2-loop scattering on superstring and supermembrane in flat space","authors":"M. Beccaria, R. Roiban, A. A. Tseytlin","doi":"10.1007/JHEP09(2025)191","DOIUrl":"10.1007/JHEP09(2025)191","url":null,"abstract":"<p>We consider the S-matrix of transverse scalar excitations on an infinite <i>D</i> = 10 GS superstring and <i>D</i> = 11 supermembrane in flat target space. We compute the 4-particle scattering amplitude in the 2-loop approximation and demonstrate that, like in the Nambu string case, the <i>D</i> = 10 GS string S-matrix does not contain non-trivial 2d UV divergences (UV pole not accompanied by terms with logarithms of momenta is an artifact of dimensional regularization). This is consistent with underlying integrability of this model which is maintaining by adding appropriate local counterterms. In the supermembrane case there are no 1-loop divergences but we find a genuine 2-loop UV pole. This demonstrates non-finiteness of the world-volume S-matrix of the M2 brane theory.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)191.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144961","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}
Giancarlo D’Ambrosio, Avital Dery, Yuval Grossman, Teppei Kitahara, Radoslav Marchevski, Diego Martínez Santos, Stefan Schacht
{"title":"CP violation in K → μ+μ− with and without time dependence through a tagged analysis","authors":"Giancarlo D’Ambrosio, Avital Dery, Yuval Grossman, Teppei Kitahara, Radoslav Marchevski, Diego Martínez Santos, Stefan Schacht","doi":"10.1007/JHEP09(2025)190","DOIUrl":"10.1007/JHEP09(2025)190","url":null,"abstract":"<p>We point out that using current knowledge of <span>( mathcal{B}left({K}_L^0to {mu}^{+}{mu}^{-}right) )</span> and <span>( mathcal{B}left({K}_L^0to gamma gamma right) )</span>, one can extract short-distance information from the combined measurement of the time-integrated CP asymmetry, <i>A</i><sub>CP</sub>(<i>K</i><sup>0</sup> <i>→ μ</i><sup>+</sup><i>μ</i><sup><i>−</i></sup>), and of <span>( mathcal{B}left({K}_S^0to {mu}^{+}{mu}^{-}right) )</span>. We discuss the interplay between this set of observables, and demonstrate that determining sign[<i>A</i><sub>CP</sub>(<i>K</i><sup>0</sup> → <i>μ</i><sup>+</sup><i>μ</i><sup><i>−</i></sup>)] would eliminate the discrete ambiguity in the Standard Model prediction for <span>( mathcal{B}left({K}_L^0to {mu}^{+}{mu}^{-}right) )</span>. We then move on to feasibility studies within an LHCb-like setup, using both time-integrated and time-dependent information, employing <i>K</i><sup>0</sup> and <span>( {overline{K}}^0 )</span> tagging methods. We find that, within an optimistic scenario, the short-distance amplitude, proportional to the CKM parameter combination <span>( mid {A}^2{lambda}^5overline{eta}mid )</span>, could be constrained by LHCb at the level of about 35% of its Standard Model value, and the discrete ambiguity in <span>( mathcal{B}{left({K}_L^0to {mu}^{+}{mu}^{-}right)}_{textrm{SM}} )</span> could be resolved at more than 3<i>σ</i> by the end of the high luminosity LHC.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)190.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144962","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}
George Gkountoumis, Chris Hull, Guo-En Nian, Stefan Vandoren
{"title":"Duality and infinite distance limits in asymmetric freely acting orbifolds","authors":"George Gkountoumis, Chris Hull, Guo-En Nian, Stefan Vandoren","doi":"10.1007/JHEP09(2025)198","DOIUrl":"10.1007/JHEP09(2025)198","url":null,"abstract":"<p>We use freely acting asymmetric orbifolds of type IIB string theory to construct a class of theories in four dimensions with eight supercharges. Their low energy effective field theories resemble <i>STU</i> models, but have different duality groups: the orbifold’s free action reduce the duality groups to congruence subgroups of the modular group. The fundamental domain is consequently larger and contains new interesting points at infinite distance on the real axis bounding the upper half plane. We verify that the distance conjectures hold in the non-geometric compactification of string theory studied here. In particular, we find points at infinite distance in moduli space at which the theory decompactifies to a different orbifold construction.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)198.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144963","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":"Circles and triangles, the NLSM and Tr(Φ3)","authors":"Nima Arkani-Hamed, Carolina Figueiredo","doi":"10.1007/JHEP09(2025)189","DOIUrl":"10.1007/JHEP09(2025)189","url":null,"abstract":"<p>A surprising connection has recently been made between the amplitudes for Tr(Φ<sup>3</sup>) theory and the non-linear sigma model (NLSM). A simple shift of kinematic variables naturally suggested by the associahedron/stringy representation of Tr(Φ<sup>3</sup>) theory yields pion amplitudes at all loops. In this note we provide an elementary motivation and proof for this link going in the opposite direction, starting from the non-linear sigma model and discovering its formulation as a sum over triangulations of surfaces with simple numerator factors. This uses an ancient connection between “circles” and “triangles”, interpreting the equation <span>( y=sqrt{1-{x}^2} )</span> both as parametrizing points a circle as well as generating the number of triangulations of polygons. A further simplification of the numerator factors exposes them as arising from the kinematically shifted Tr(Φ<sup>3</sup>) theory, and gives rise to novel tropical representations of NLSM amplitudes. The connection to Tr(Φ<sup>3</sup>) theory defines a natural notion of “surface-soft limit” intrinsic to curves on surfaces. Remarkably, with this definition, the soft limit of pion amplitudes vanishes directly at the level of the integrand, via obvious pairwise cancellations. We also give simple, explicit expressions for the multi-soft factors for tree and loop-level integrands in the limit as any number of pions are taken “surface-soft”.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)189.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144965","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":"Dynamics and gravitational radiation of binaries with spin precession and eccentricity in dynamical Chern-Simons gravity","authors":"Zhao Li, Wen Zhao","doi":"10.1007/JHEP09(2025)187","DOIUrl":"10.1007/JHEP09(2025)187","url":null,"abstract":"<p>Testing parity symmetry constitutes a critical aspect in gravitational physics. As a representative parity-violating theory, dynamical Chern-Simons (dCS) gravity has attracted significant attention in recent gravitational wave (GW) studies. Numerous works have constrained the dCS theory through GW observations using quasi-circular waveform templates. Since GW parameter estimation depends critically on waveform template accuracy, improved source modeling and waveform construction are essential for tighter constraints on parity-violating gravity. This work explores the dynamics and gravitational radiation from the binary black hole systems with orbital eccentricity and spin precession. By extending the quasi-Keplerian parameterization, we solve the equations of motion including leading-order dCS corrections and precession effects. Furthermore, the conservative sectors of the gravitational and scalar radiation are presented, the corresponding energy and angular momentum loss are calculated, and the orbital decay is also investigated. Notably, because of the non-zero monopole scalar radiation, carrying energy but not angular momentum, the zero-eccentricity orbit is no longer the final stable state of binaries under radiation reaction. This work provides the theoretical foundation for the complete waveform construction in dCS gravity, benefiting the future gravitational parity-symmetry tests.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)187.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144966","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":"Impact on L-observables of a new combined analysis of Bd,s → K(∗) form factors","authors":"Aritra Biswas, Nico Gubernari, Joaquim Matias, Gilberto Tetlalmatzi-Xolocotzi","doi":"10.1007/JHEP09(2025)188","DOIUrl":"10.1007/JHEP09(2025)188","url":null,"abstract":"<p>We explore the impact of a combined analysis of <i>B</i><sub><i>d</i>,<i>s</i></sub> → <i>K</i><sup>(∗)</sup> form factors on a set of <i>L</i>-observables. The <i>L</i>-observables are constructed from ratios of branching fractions in <i>B</i><sub><i>s</i></sub> → <i>VV</i>, <i>PP</i>, <i>PV</i> versus <i>B</i><sub><i>d</i></sub> → <i>VV</i>, <i>PP</i>, <i>PV</i> decays with <i>P</i> = <i>K</i><sup>0</sup>, <span>( {overline{K}}^0 )</span> and <i>V</i> = <i>K</i><sup>∗0</sup>, <span>( {overline{K}}^{ast 0} )</span>, thereby partially reducing their hadronic uncertainties. We show the change of the Standard Model predictions of the <i>L</i>-observables under different determinations of the ratio of the relevant form factors (with correlations) including lattice QCD data and a novel light-cone sum rule analysis. In addition, we provide precise results for all <i>B</i><sub><i>d</i>,<i>s</i></sub> → <i>K</i><sup>(∗)</sup> form factors in machine-readable files. We find that the inclusion of our up-to-date results, as well as the use or omission of lattice QCD data for the form factors, has a significant impact on the <i>L</i>-observables. We also discuss how the New Physics interpretation is affected by the updated form factors and present revised predictions for the mechanism identified in our analysis of <i>B</i> → <i>VP</i> decays, now employing more suitable new experimental observables defined in this paper.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)188.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145105","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}
Sophie Kollatzsch, Daniel Moreno, David Radic, Adrian Signer
{"title":"Parity violation in Møller scattering within low-energy effective field theory","authors":"Sophie Kollatzsch, Daniel Moreno, David Radic, Adrian Signer","doi":"10.1007/JHEP09(2025)196","DOIUrl":"10.1007/JHEP09(2025)196","url":null,"abstract":"<p>We include electroweak effects in Møller scattering at low energies in an effective field theory approach and compute the left-right parity-violating asymmetry. The calculation using low-energy effective field theory provides a solid framework to integrate out heavy particles with masses of the order of the electroweak scale, allowing the resummation of all large logarithms between the electroweak scale and the scale, where QCD perturbation theory breaks down. The NLO electroweak corrections with leading logarithmic resummation, combined with QED corrections at NNLO and hadronic effects are implemented into the Monte Carlo framework M<span>c</span>M<span>ule</span>. Thus, we obtain a fully differential description and present results adapted to the MOLLER experiment. The potential impact of large logarithms at the next-to-leading logarithmic level is investigated.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)196.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144964","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":"Sampling NNLO QCD phase space with normalizing flows","authors":"Timo Janßen, Rene Poncelet, Steffen Schumann","doi":"10.1007/JHEP09(2025)194","DOIUrl":"10.1007/JHEP09(2025)194","url":null,"abstract":"<p>We showcase the application of neural importance sampling for the evaluation of NNLO QCD scattering cross sections. We consider Normalizing Flows in the form of discrete Coupling Layers and time continuous flows for the integration of the various cross-section contributions when using the sector-improved residue subtraction scheme. We thereby consider the stratification of the integrands into their positive and negative contributions, and separately optimize the phase-space sampler. We exemplify the novel methods for the case of gluonic top-quark pair production at the LHC at NNLO QCD accuracy. We find significant gains with respect to the current default methods used in STRIPPER in terms of reduced cross-section variances and increased unweighting efficiencies. In turn, the computational costs for evaluations of the integrand needed to achieve a certain statistical uncertainty for the cross section can be reduced by a factor 8.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)194.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145102","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}