arXiv - PHYS - High Energy Physics - Phenomenology最新文献

On Precision of the Leptonic Mixing Angle $θ_{23}$ and its Implications for the Flavor Models 论列质子混合角 $θ_{23}$ 的精度及其对味模型的影响

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.11824

Son Cao, P. T. Quyen, N. T. Hong Van, Ankur Nath, T. V. Ngoc

{"title":"On Precision of the Leptonic Mixing Angle $θ_{23}$ and its Implications for the Flavor Models","authors":"Son Cao, P. T. Quyen, N. T. Hong Van, Ankur Nath, T. V. Ngoc","doi":"arxiv-2409.11824","DOIUrl":"https://doi.org/arxiv-2409.11824","url":null,"abstract":"Among three leptonic mixing angles, $theta_{23}$ angle, which characterizes\u0000the fractional contribution of two flavor eigenstates $nu_{mu}$ and\u0000$nu_{tau}$ to the third mass eigenstate $nu_3$, is known to be the largest\u0000but the least precisely measured. The work investigates possible reach of\u0000$theta_{23}$ precision with two upcoming gigantic accelerator-based\u0000long-baseline neutrino experiments, namely Hyper-Kamiokande and DUNE\u0000experiments as well as a possible joint analyses of future neutrino facilities.\u0000Our simulation yields that each experiment will definitely establish the octant\u0000of $theta_{23}$ angle for all values within 1$sigma$ parameter interval,\u0000while considering the current limitation. However, if the actual value is\u0000$0.48leq sin^2theta_{23}leq 0.54$, it becomes challenging for these two\u0000experiments to reject the maximal ($theta_{23}=pi/4$) hypothesis and conclude\u0000its octant. This octant-blind region can be further explored with the proposed\u0000facilities ESSnuSB and a neutrino factory. Accurate determination of the mixing\u0000angle $theta_{23}$, as well as the accuracy of $delta_{CP}$, is crucial for\u0000examining a certain category of discrete non-Abelian leptonic flavor models.\u0000Specifically if CP is conserved in leptonic sector, the combined analysis of\u0000Hyper-K and DUNE will rule out the majority of these models. However, if the CP\u0000is maximally violated, higher precision of $delta_{CP}$ is necessary for\u0000testing these flavor models.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Leading-colour-based unweighted event generation for multi-parton tree-level processes 基于前导色的多粒子树级过程非加权事件生成

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.12128

Rikkert Frederix, Timea Vitos

引用次数: 0

Probing the cosmic sterile-neutrino background with IceCube 利用冰立方探测宇宙不育中微子背景

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.12145

Bhavesh Chauhan, Priyank Parashari

{"title":"Probing the cosmic sterile-neutrino background with IceCube","authors":"Bhavesh Chauhan, Priyank Parashari","doi":"arxiv-2409.12145","DOIUrl":"https://doi.org/arxiv-2409.12145","url":null,"abstract":"In this paper, we take a close look at the interaction between the TeV--PeV\u0000energy astrophysical neutrinos and a hypothetical cosmic sterile-neutrino\u0000background. These interactions yield absorption features, also called ``dips\",\u0000in the astrophysical neutrino spectrum, which are studied using the deposited\u0000energy distribution of high-energy starting events (HESE) in the IceCube\u0000detector. We improve upon the previous analysis by including the effects of\u0000regeneration and a realistic source distribution on the propagation of\u0000astrophysical neutrinos. We use the latest 7.5-year HESE dataset and include\u0000the observation of Glashow resonance in our analysis. We evaluate the impact of\u0000these dips on the inferred spectral index and overall normalization of the\u0000astrophysical neutrinos. We find a mild preference for dips in the 300--800 TeV\u0000range, and the best-fit parameters for the mass of sterile-neutrino and the\u0000mediator are 0.5 eV and 23 MeV, respectively. We find that the inclusion of\u0000these absorption features lowers the spectral index of astrophysical neutrinos\u0000to $2.60^{+0.19}_{-0.16}$. The lower spectral index can reduce the disagreement\u0000with the Northern Tracks sample but requires dedicated analysis. We also\u0000forecast the event spectrum for IceCube-Gen2 for the two different fits.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective masses and magnetic moments of charmed baryons in asymmetric hot strange hadronic matter 不对称热奇异强子物质中粲重子的有效质量和磁矩

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.11878

Suneel Dutt, Arvind Kumar, Harleen Dahiya

{"title":"Effective masses and magnetic moments of charmed baryons in asymmetric hot strange hadronic matter","authors":"Suneel Dutt, Arvind Kumar, Harleen Dahiya","doi":"arxiv-2409.11878","DOIUrl":"https://doi.org/arxiv-2409.11878","url":null,"abstract":"In the present work, we have studied the masses and magnetic moments of\u0000spin$-{frac{1}{2}}^+$ and spin$-{frac{3}{2}}^+$ singly and doubly charmed\u0000baryons in the strange hadronic medium at finite temperature using the chiral\u0000SU(3) quark mean field model. The properties of baryons within the framework of\u0000chiral SU(3) mean field model are defined in terms of constituent quark masses\u0000and energies, which are modified through the exchange of scalar fields\u0000$sigma$, $zeta$ and $delta$ and the vector fields $omega$, $rho$ and\u0000$phi$. The scalar-isovector field, $delta$ and the vector-isovector field,\u0000$rho$ contribute when medium has finite isospin asymmetry. We have calculated\u0000the effective masses of constituent quarks and charmed baryons in the nuclear\u0000and strange matter within the chiral SU(3) quark mean field model and have used\u0000these as the input in SU(4) constituent chiral quark model to compute the\u0000effective magnetic moments of these baryons. Considering the configuration\u0000mixing, the contributions of valence quarks, quark sea and orbital angular\u0000momentum of quark sea have been considered explicitly to calculate the\u0000in-medium magnetic moments.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sea-quark dynamics in decuplet ($frac{3}{2}^+$) $rightarrow$ octet ($frac{1}{2}^+$) transition quadrupole moment 十子（$frac{3}{2}^+$）和八子（$frac{1}{2}^+$）过渡四极矩中的海夸克动力学

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.11740

Preeti Bhall, Alka Upadhyay

{"title":"Sea-quark dynamics in decuplet ($frac{3}{2}^+$) $rightarrow$ octet ($frac{1}{2}^+$) transition quadrupole moment","authors":"Preeti Bhall, Alka Upadhyay","doi":"arxiv-2409.11740","DOIUrl":"https://doi.org/arxiv-2409.11740","url":null,"abstract":"We investigated the electromagnetic quadrupole transition of baryon decuplet\u0000($J^P= frac{3}{2}^+$) to octet ($J^P= frac{1}{2}^+$) using the statistical\u0000framework together with the principle of detailed balance. The statistical\u0000approach assumed the expansion of hadrons in terms of various quark-gluon Fock\u0000states. By specifying the appropriate multiplicity in spin, color $&$ flavor\u0000space, the relative probabilities of strange and non-strange quark-gluon Fock\u0000state are calculated. These probabilities further accumulated in the form of\u0000statistical parameters, highlighting the importance of sea quarks and gluons in\u0000the electromagnetic transition. Our calculations includes the individual\u0000contribution of valence and sea (scalar, vector and tensor ) to the transition\u0000moment of baryons. The effect of flavor SU(3) symmetry and its breaking in both\u0000valence and sea quarks is studied by incorporating the strange quark mass. The\u0000strangeness in the sea is constrained by a suppression factor $(1-C_l)^{n-1}$,\u0000which depends upon the free energy of gluons. The computed results get affected\u0000upto 60 $%$ and exhibit the dominance of octet sea. The present work has been\u0000compared with updated experimental data and various theoretical predictions.\u0000The results obtained may offer important insights for future experimental\u0000studies.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From formation to evaporation: Induced gravitational wave probes of the primordial black hole reheating scenario 从形成到蒸发：原始黑洞再加热情景的引力波探测器

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.12125

Guillem Domènech, Jan Tränkle

{"title":"From formation to evaporation: Induced gravitational wave probes of the primordial black hole reheating scenario","authors":"Guillem Domènech, Jan Tränkle","doi":"arxiv-2409.12125","DOIUrl":"https://doi.org/arxiv-2409.12125","url":null,"abstract":"We study the Primordial Black Hole (PBH) reheating scenario, where PBHs\u0000originate in a general cosmological background. In this scenario, ultralight\u0000PBHs with masses $Mlesssim 10^8$g temporarily dominate the Universe and reheat\u0000it via Hawking radiation before Big Bang Nucleosynthesis (BBN). We investigate\u0000whether the induced Gravitational Wave (GW) spectrum associated with PBH\u0000reheating contains information about the pre-PBH-dominated stage, namely the\u0000initial equation of state $w$ (after inflation). We first derive the transfer\u0000functions of curvature fluctuations for general $w$ with adiabatic and\u0000isocurvature initial conditions. We find that, in general, a stiffer equation\u0000of state enhances the induced GW amplitude as it allows for a longer PBH\u0000dominated phase compared to the radiation dominated case. We also find that the\u0000spectral slope of GWs induced by primordial curvature fluctuations is sensitive\u0000to $w$, while the spectral slope of GWs induced by PBH number density\u0000fluctuations is not. Lastly, we derive constraints of the initial PBH abundance\u0000as a function of $w$, using BBN and Cosmic Microwave Background (CMB)\u0000observations. A stiffer equation of state leads to stricter constraints on the\u0000initial energy density fraction, as induced GWs are enhanced. Interestingly, we\u0000find that such induced GW signals may enter the observational window of several\u0000future GW detectors, such as LISA and the Einstein Telescope. Our formulas,\u0000especially the curvature fluctuation transfer functions, are applicable to any\u0000early matter-dominated universe scenario.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fully charmed tetraquark production at the LHC experiments 大型强子对撞机实验中的全粲四夸克产生

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.12070

Ilia Belov, Alessandro Giachino, Elena Santopinto

{"title":"Fully charmed tetraquark production at the LHC experiments","authors":"Ilia Belov, Alessandro Giachino, Elena Santopinto","doi":"arxiv-2409.12070","DOIUrl":"https://doi.org/arxiv-2409.12070","url":null,"abstract":"We develop the formalism for production of a fully heavy tetraquark and apply\u0000it to the calculation of $ppto T_{4c}+X$ cross-sections. We demonstrate that\u0000the production cross-section of a fully heavy tetraquark, even if it is a\u0000diquark-antidiquark cluster, can be obtained in the meson-like basis, for which\u0000the spin-color projection technique is well established. Prompted by the recent\u0000LHCb, ATLAS and CMS data, we perform a pQCD calculation of ${cal\u0000O}(alpha_s^5)$ short-distance factors in the dominant channel of gluon fusion,\u0000and match these to the four-body $T_{4c}$ wave functions in order to obtain the\u0000unpolarized $T_{4c}(0^{++},1^{+-},2^{++})$ cross-sections. The novelty in\u0000comparison with the recently published article~cite{Feng:2023agq} lies in the\u0000fact that we predict the absolute values as well as the $dsigma/dp_T$ spectra\u0000in the kinematic ranges accessible at the ongoing LHC experiments. From the\u0000comparison with the signal yield at LHCb we derive the constraints on the\u0000$Phicdottext{Br}(J/psi,J/psi)$ (reduced wave function times branching)\u0000product for the $T_{4c}$ candidates for $X(6900)$ and observe that $X(6900)$ is\u0000compatible with a $2^{++}(2S)$ state.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unveiling the Secrets of New Physics Through Top Quark Tagging 通过顶级夸克标记揭开新物理学的秘密

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-18 DOI: arxiv-2409.12085

Rameswar Sahu, Saiyad Ashanujjaman, Kirtiman Ghosh

引用次数: 0

Hidden strangeness in meson weak decays to baryon pair 介子弱衰变到重子对的隐藏奇异性

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-17 DOI: arxiv-2409.11374

Chao-Qiang Geng, Xian-Nan Jin, Chia-Wei Liu, Xiao Yu

{"title":"Hidden strangeness in meson weak decays to baryon pair","authors":"Chao-Qiang Geng, Xian-Nan Jin, Chia-Wei Liu, Xiao Yu","doi":"arxiv-2409.11374","DOIUrl":"https://doi.org/arxiv-2409.11374","url":null,"abstract":"We study the weak decays of heavy mesons into baryon pairs, focusing on\u0000channels dominated by annihilation-type diagrams, where short-distance (SD)\u0000contributions are highly suppressed. We focus on decays with small energy\u0000release to further ensure the dominance of long-distance (LD) physics. The\u0000final state interactions of the triangular diagrams do not require a cutoff,\u0000making our numerical results reliable. Moreover, the hidden strangeness in the\u0000intermediate state naturally avoids chiral suppression. The branching fractions\u0000are predicted to be ${cal B}(D_s^+ to poverline{n}) = (1.43 pm 0.10 )\u0000times 10^{-3}$ and ${cal B} (B_s^0 to Lambda_c^+ overline{Lambda}_c^-) >\u00004.7 times 10^{-5}$, respectively. The former is in agreement with the\u0000experimental data of $(1.22 pm 0.11)times 10^{-3}$, while the latter suggests\u0000that a measurement is now feasible. Using the experimental upper bound of\u0000${cal B} (B_s^0 to Lambda_c^+ overline{Lambda}_c^-) < 8 times 10^{-5}$,\u0000we set a constraint on the coupling constant $g_{D^+ Lambda_c^+ n} < 7.5$. The\u0000CP symmetry suggests that $B_{sH/L}^0 to Lambda_c^+ overline{Lambda}_c^-$\u0000is dominated by $P/S$ wave. This selection rule distinguishes the SD and LD\u0000contributions, allowing experiments to further test our understanding in the\u0000nonperturbative region. We propose future measurements on $B^0 to Xi_c^+\u0000overline{Xi}_c^-$ to test final state interaction mechanisms, predicting\u0000significant $SU(3)_F$ breaking effects with ${cal B}(B^0 to Xi_c^+\u0000overline{Xi}_c^-) / {cal B} (B_s^0 to Lambda_c^+ overline{Lambda}_c^-) =\u00001.4%$, contrary to the naive estimate of $5.3%$.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"201 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quark mass dependence of doubly heavy tetraquark binding 双重四夸克结合的夸克质量依赖性

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-17 DOI: arxiv-2409.11477

W. G. Parrott, B. Colquhoun, A. Francis, R. J. Hudspith, R. Lewis, K. Maltman

引用次数: 0