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arXiv 0712.0145hep-ph
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SN 1987 A对天体非粒子物理的约束

Constraints on Astro-unparticle Physics from SN 1987A

Sukanta Dutta, Ashok Goyal

摘要:

SN 1987 A观测已被用于对标准模型粒子和非粒子之间的相互作用施加约束。本文计算了简并核物质通过一π交换相互作用时,通过核韧致辐射的标量、赝标量、矢量、赝矢量非粒子辐射从超新星核的能量损失。为了考察$d_{\cal U}=1$的约束条件,我们考虑了标量、赝标量、矢量、赝矢量和张量通过对湮灭过程$e^+e^-\to {\cal U} γ$的发射。此外,我们还重新研究了其他对湮灭过程。对于赝标量耦合$\bigl|λ^{\cal P}_{0,1}\bigr|\leq 4\times 10^{-11}$和赝矢量耦合$\bigl|λ^{\cal T}\bigr| \leq 6\times 10^{-6}$,由核韧致辐射过程得到了$d_{\cal U} =1$和$Λ_{\cal U}= m_Z$的无量纲耦合常数的最严格界,对于张量相互作用,由$e^+ e^-\to {\cal U} γ$得到了无量纲耦合常数的最佳界,从而得到了$\bigl|λ^{\cal T}\bigr| \leq 6\times 10^{-6}$ .

英文摘要:

SN 1987A observations have been used to place constraints on the interactions between standard model particles and unparticles. In this study we calculate the energy loss from the supernovae core through scalar, pseudo scalar, vector, pseudo vector unparticle emission from nuclear bremsstrahlung for degenerate nuclear matter interacting through one pion exchange. In order to examine the constraints on $d_{\cal U}=1$ we considered the emission of scalar, pseudo scalar, vector, pseudo vector and tensor through the pair annihilation process $e^+e^-\to {\cal U} γ$. In addition we have re-examined other pair annihilation processes. The most stringent bounds on the dimensionless coupling constants for $d_{\cal U} =1$ and $Λ_{\cal U}= m_Z$ are obtained from nuclear bremsstrahlung process for the pseudo scalar and pseudo-vector couplings $\bigl|λ^{\cal P}_{0,1}\bigr|\leq 4\times 10^{-11}$ and for tensor interaction, the best limit on dimensionless coupling is obtained from $e^+ e^-\to {\cal U} γ$ and we get $\bigl|λ^{\cal T}\bigr| \leq 6\times 10^{-6}$.

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