Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector-猫眼课题宝

DOI：

10.1103/physrevd.106.092006

发表时间：

2022-07

期刊：

Physical Review D

影响因子：

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

M. C. P. Abratenko;J. Anthony;L. Arellano;J. Asaadi;A. Ashkenazi;S. Balasubramanian;B. Baller;C. Barnes;G. Barr;J. Barrow;V. Basque;L. Bathe-Peters;O. Rodrigues;S. Berkman;A. Bhanderi;M. Bhattacharya;M. Bishai;A. Blake;B. Bogart;T. Bolton;J. Book;L. Camilleri;D. Caratelli;I. C. Terrazas;F. Cavanna;G. Cerati;Y. Chen;J. Conrad;M. Convery;L. Cooper-Troendle;J. I. Crespo-Anadón;M. Tutto;S. Dennis;P. Detje;A. Devitt;R. Diurba;R. Dorrill;K. Duffy;S. Dytman;B. Eberly;A. Ereditato;J. Evans;R. Fine;O. G. Finnerud;B. Fleming;N. Foppiani;W. Foreman;D. Franco;A. Furmanski;D. Garcia-Gamez;S. Gardiner;G. Ge;S. Gollapinni;O. Goodwin;E. Gramellini;P. Green;H. Greenlee;W. Gu;R. Guenette;P. Guzowski;L. Hagaman;O. Hen;R. Hicks;C. Hilgenberg;G. Horton-Smith;R. Itay;C. James;X. Ji;L. Jiang;J. Jo;R. Johnson;Y. Jwa;D. Kalra;N. Kamp;N. Kaneshige;G. Karagiorgi;W. Ketchum;M. Kirby;T. Kobilarcik;I. Kreslo;M. Leibovitch;I. Lepetic;J.-Y. Li;K. Li;Y. Li;K. Lin;B. Littlejohn;W. Louis;X. Luo;K. Manivannan;C. Mariani;D. Marsden;J. Marshall;D. A. Caicedo;K. Mason;A. Mastbaum;N. McConkey;V. Meddage;K. Miller;J. Mills;K. Mistry;T. Mohayai;A. Mogan;M. Mooney;A. Moor;C. Moore;L. Lepin;J. Mousseau;S. Babu;D. Naples;A. Navrer-Agasson;N. Nayak;M. Nebot-Guinot;D. Newmark;J. Nowak;M. Nunes;N. Oza;O. Palamara;N. Pallat;V. Paolone;A. Papadopoulou;Vicky Papavassiliou;H. Parkinson;S. Pate;N. Patel;Z. Pavlovic;E. Piasetzky;I. Ponce-Pinto;S. Prince;X. Qian;J. Raaf;V. Radeka;A. Rafique;M. Reggiani-Guzzo;L. Ren;L. Rice;L. Rochester;J. Rondon;M. Rosenberg;M. Ross-Lonergan;C. Rohr;G. Scanavini;D. Schmitz;A. Schukraft;W. Seligman;M. Shaevitz;R. Sharankova;J. Shi;A. Smith;E. Snider;M. Soderberg;S. Soldner-Rembold;J. Spitz;M. Stancari;J. John;T. Strauss;S. Sword-Fehlberg;A. Szelc;W. Tang;N. Taniuchi;K. Terao;C.Thorpe;D. Torbunov;D. Totani;M. Toups;Y. Tsai;J. Tyler;M. Uchida;T. Usher;B. Viren;M. Weber;H. Wei;A. White;Z. Williams;S. Wolbers;T. Wongjirad;M. Wospakrik;K. Wresilo;N. Wright;W. Wu;E. Yandel;T. Yang;L. Yates;H. Yu;G. Zeller;J. Zennamo;C. Zhang

我们提出了在MicroBooNE液体-Ar时间投影室中寻找长寿命Higgs门区标量(HPS)和重中性轻子(HNL)衰变的方法。测量是使用与费米实验室主注入器的Numi中微子束同步收集的数据进行的，总曝光量相当于7.01美元乘以10^{20}$质子到目标上。对于质量为$m_{\rm HNL}=246$MeV的Majorana HNL，我们将混合参数$\lvert U_{\mu4}\rvert^2$设置为$90\$置信度上限，范围从$\lvert U_{\mu4}\rvert^2&lt；对于$m_{rm HNL}=385$MeV，0.92\x 10^-8}$，假设$\lvert U_{e4}\rvert^2=\lvert U_{\tau 4}\rvert^2=0$且HNL衰减为$\mu^\pm\pi^\MP$对。这些对$\lvert U_{\mu4}\rvert^2$的限制表示与以前的MicroBooNE结果相比，灵敏度提高了一个数量级。我们还通过搜索HPS衰变到$\mU^+\mU^-$终态来约束标量-Higgs混合角，排除参数空间中下界为$\theta^2&lt；31.3\x 10^-9}$m_{rm Hps}=212$GeV和$\theta^2&lt；1.09\x 10^-9}$m_{\rm Hps}=275$GeV的等高线。这是专门在这个质量范围内进行的实验对标量-希格斯混合角的第一次限制。

We present a search for long-lived Higgs portal scalars (HPS) and heavy neutral leptons (HNL) decaying in the MicroBooNE liquid-argon time projection chamber. The measurement is performed using data collected synchronously with the NuMI neutrino beam from Fermilab's Main Injector with a total exposure corresponding to $7.01 \times 10^{20}$ protons on target. We set upper limits at the $90\%$ confidence level on the mixing parameter $\lvert U_{\mu 4}\rvert^2$ ranging from $\lvert U_{\mu 4}\rvert^2<12.9\times 10^{-8}$ for Majorana HNLs with a mass of $m_{\rm HNL}=246$ MeV to $\lvert U_{\mu 4}\rvert^2<0.92 \times 10^{-8}$ for $m_{\rm HNL}=385$ MeV, assuming $\lvert U_{e 4}\rvert^2 = \lvert U_{\tau 4}\rvert^2 = 0$ and HNL decays into $\mu^\pm\pi^\mp$ pairs. These limits on $\lvert U_{\mu 4}\rvert^2$ represent an order of magnitude improvement in sensitivity compared to the previous MicroBooNE result. We also constrain the scalar-Higgs mixing angle $\theta$ by searching for HPS decays into $\mu^+\mu^-$ final states, excluding a contour in the parameter space with lower bounds of $\theta^2<31.3 \times 10^{-9}$ for $m_{\rm HPS}=212$ GeV and $\theta^2<1.09 \times 10^{-9}$ for $m_{\rm HPS}=275$ GeV. These are the first constraints on the scalar-Higgs mixing angle $\theta$ from a dedicated experimental search in this mass range.

Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector

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