Pub Date : 2020-11-01DOI: 10.1103/PhysRevD.103.L091101
M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, M. An, Q. An, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Çetin, J. F. Chang, W. Chang, G. Chelkov, D. Y. Chen, G. Chen, H. S. Chen, M. L. Chen, S. J. Chen, X. R. Chen, Y. B. Chen, Z. J. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, X. Dai, A. Dbeyssi, R. de Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, X. Dong, S. Du, Y. L. Fan, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, J. H. Feng, M. Fritsch, C. Fu, Y. Gao, Y. G. Gao, I. Garzia, P. Ge, C. Geng, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. B. Guo, R. Guo, Y. P. Guo, A. Guskov, T. Han, W. Han, X. Ha
We report on a comparison of two possible $Lambda_c^+$ spin hypotheses, $J=frac{1}{2}$ and $frac{3}{2}$, via the process $e^+e^-toLambda_c^+barLambda_c^-$, using the angular distributions of $Lambda_c^+$ decays into $pK_S^0$, $Lambdapi^+$, $Sigma^0pi^+$, and $Sigma^+pi^0$. The data were recorded at $sqrt s = 4.6$ GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb$^{-1}$. The $Lambda_c^+$ spin is determined to be $J=frac{1}{2}$, with this value favored over the $frac{3}{2}$ hypothesis with a significance of $7.98$ standard deviations ($sigma$) with a boundary $(7.89sim8.84)sigma$, corresponding to the observed range of systematic variations.
通过$e^+e^-toLambda_c^+barLambda_c^-$的过程，利用$Lambda_c^+$衰变为$pK_S^0$、$Lambdapi^+$、$Sigma^0pi^+$和$Sigma^+pi^0$的角分布，对$J=frac{1}{2}$和$frac{3}{2}$两种可能的自旋假设$Lambda_c^+$进行比较。用BESIII探测器在$sqrt s = 4.6$ GeV记录数据，对应的综合光度为587 pb $^{-1}$。确定$Lambda_c^+$自旋为$J=frac{1}{2}$，该值优于$frac{3}{2}$假设，其显著性为$7.98$标准差($sigma$)，边界为$(7.89sim8.84)sigma$，与观察到的系统变化范围相对应。
{"title":"Determination of the $Lambda_c^+$ spin via the reaction $e^+e^-toLambda_c^+barLambda_c^-$","authors":"M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, M. An, Q. An, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Çetin, J. F. Chang, W. Chang, G. Chelkov, D. Y. Chen, G. Chen, H. S. Chen, M. L. Chen, S. J. Chen, X. R. Chen, Y. B. Chen, Z. J. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, X. Dai, A. Dbeyssi, R. de Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, X. Dong, S. Du, Y. L. Fan, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, J. H. Feng, M. Fritsch, C. Fu, Y. Gao, Y. G. Gao, I. Garzia, P. Ge, C. Geng, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. B. Guo, R. Guo, Y. P. Guo, A. Guskov, T. Han, W. Han, X. Ha","doi":"10.1103/PhysRevD.103.L091101","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.L091101","url":null,"abstract":"We report on a comparison of two possible $Lambda_c^+$ spin hypotheses, $J=frac{1}{2}$ and $frac{3}{2}$, via the process $e^+e^-toLambda_c^+barLambda_c^-$, using the angular distributions of $Lambda_c^+$ decays into $pK_S^0$, $Lambdapi^+$, $Sigma^0pi^+$, and $Sigma^+pi^0$. The data were recorded at $sqrt s = 4.6$ GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb$^{-1}$. The $Lambda_c^+$ spin is determined to be $J=frac{1}{2}$, with this value favored over the $frac{3}{2}$ hypothesis with a significance of $7.98$ standard deviations ($sigma$) with a boundary $(7.89sim8.84)sigma$, corresponding to the observed range of systematic variations.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83194620","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}
Pub Date : 2020-10-27DOI: 10.1103/physrevd.103.012004
L. C. R. Aaij, C. Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, Federico Alessio, M. Alexander, A. A. Albero, Z. Aliouche, G. Alkhazov, P. Cartelle, S. Amato, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J. Back, S. Baker, P. Rodriguez, V. Balagura, W. Baldini, J. B. Leite, R. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, E. Bertholet, A. Bertolin, C. Betancourt, F. Betti, M. Bettler, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. Bieker, S. Bifani, P. Billoir, M. Birch, F. Bishop, A. Bizzeti, M. Bjørn, M. Blago, T. Blake, F. Blanc, S.
Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $Xi_b^0$ resonance decaying to the $Xi_b^-pi^+$ final state is presented. The state, referred to as $Xi_b(6227)^0$, has a measured mass and natural width of $m(Xi_b(6227)^0) = 6227.1^{,+1.4}_{,-1.5}pm0.5$ MeV, $Gamma(Xi_b(6227)^0) = 18.6^{,+5.0}_{,-4.1}pm1.4$ MeV, where the uncertainties are statistical and systematic. The production rate of the $Xi_b(6227)^0$ state relative to that of the $Xi_b^-$ baryon in the kinematic region $2
{"title":"Observation of a new \u0000Ξb0\u0000 state","authors":"L. C. R. Aaij, C. Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, Federico Alessio, M. Alexander, A. A. Albero, Z. Aliouche, G. Alkhazov, P. Cartelle, S. Amato, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J. Back, S. Baker, P. Rodriguez, V. Balagura, W. Baldini, J. B. Leite, R. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, E. Bertholet, A. Bertolin, C. Betancourt, F. Betti, M. Bettler, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. Bieker, S. Bifani, P. Billoir, M. Birch, F. Bishop, A. Bizzeti, M. Bjørn, M. Blago, T. Blake, F. Blanc, S.","doi":"10.1103/physrevd.103.012004","DOIUrl":"https://doi.org/10.1103/physrevd.103.012004","url":null,"abstract":"Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $Xi_b^0$ resonance decaying to the $Xi_b^-pi^+$ final state is presented. The state, referred to as $Xi_b(6227)^0$, has a measured mass and natural width of $m(Xi_b(6227)^0) = 6227.1^{,+1.4}_{,-1.5}pm0.5$ MeV, $Gamma(Xi_b(6227)^0) = 18.6^{,+5.0}_{,-4.1}pm1.4$ MeV, where the uncertainties are statistical and systematic. The production rate of the $Xi_b(6227)^0$ state relative to that of the $Xi_b^-$ baryon in the kinematic region $2<eta<5$ and $p_{rm T}<30$ GeV is measured to be $frac{f_{Xi_b(6227)^0}}{f_{Xi_b^-}}{mathcal{B}}(Xi_b(6227)^0toXi_b^-pi^+) = 0.045pm0.008pm0.004$, where ${mathcal{B}}(Xi_b(6227)^0toXi_b^-pi^+)$ is the branching fraction of the decay, and $f_{Xi_b(6227)^0}$ and $f_{Xi_b^-}$ represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed $Xi_b(6227)^-$ state, along with the mass of the $Xi_b^-$ baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73878414","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}
Heavy-flavour hadrons, containing open or hidden charm and beauty flavours, are considered as hard probes of the quark-gluon plasma (QGP), which is a hot and dense phase state of quantum chromodynamics (QCD) matter. Production of heavy flavours involves large momentum transfer processes during collisions. Heavy quarks are expected to be produced in the initial stage of collisions and therefore prior to the formation of the QGP in heavy-ion collisions. Consequently, heavy quarks travel through and interact with the QGP. Hence, measuring both open and hidden heavy-flavour production in large systems provides information on the QGP properties and heavy quark hadronisation. Heavy-flavour production is measured in small and large systems with ALICE in order to test (perturbative) QCD and study the effects induced by the medium. In this contribution, recent ALICE results on heavy-flavour production in pp, p-Pb and Pb-Pb collisions are reported.
{"title":"Recent results on heavy flavor in small and large systems from ALICE","authors":"Chun-lu Huang","doi":"10.22323/1.382.0036","DOIUrl":"https://doi.org/10.22323/1.382.0036","url":null,"abstract":"Heavy-flavour hadrons, containing open or hidden charm and beauty flavours, are considered as hard probes of the quark-gluon plasma (QGP), which is a hot and dense phase state of quantum chromodynamics (QCD) matter. Production of heavy flavours involves large momentum transfer processes during collisions. Heavy quarks are expected to be produced in the initial stage of collisions and therefore prior to the formation of the QGP in heavy-ion collisions. Consequently, heavy quarks travel through and interact with the QGP. Hence, measuring both open and hidden heavy-flavour production in large systems provides information on the QGP properties and heavy quark hadronisation. Heavy-flavour production is measured in small and large systems with ALICE in order to test (perturbative) QCD and study the effects induced by the medium. In this contribution, recent ALICE results on heavy-flavour production in pp, p-Pb and Pb-Pb collisions are reported.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79255512","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}
Pub Date : 2020-10-19DOI: 10.5506/aphyspolb.51.2097
A. Saad, F. Kocak
In this paper, we investigate the effect on energy resolution from changing the angle and the position of incidence photon for a 5 $times$ 5 crystal matrix built with (25 $times$ 25 $times$ 200) mm$^{3}$ LYSO scintillating crystals. Those crystals have been proposed for the electromagnetic calorimeter of the Turkish Accelerator Center-Particle Factory (TAC-PF) detector. The energy resolution was obtained as $sigma_{E}/E = 0.42 % / sqrt{E/GeV} oplus 1.60 %$ at the center of the matrix in the energy range of 50 MeV to 2 GeV. When we examined the dependence of the energy resolution on the incidence angle of the photon, resolution began to deteriorate at angles greater than $2^{circ}$ on the 5 $times$ 5 crystal matrix. Moreover, energy resolution at the corners of the central crystal was worse than at the center of the central crystal by a factor of 1.3 at 50 MeV and 1.1 at 2 GeV.
{"title":"Evaluation of Energy Resolution by Changing Angle and Position of Incident Photon in a LYSO Calorimeter","authors":"A. Saad, F. Kocak","doi":"10.5506/aphyspolb.51.2097","DOIUrl":"https://doi.org/10.5506/aphyspolb.51.2097","url":null,"abstract":"In this paper, we investigate the effect on energy resolution from changing the angle and the position of incidence photon for a 5 $times$ 5 crystal matrix built with (25 $times$ 25 $times$ 200) mm$^{3}$ LYSO scintillating crystals. Those crystals have been proposed for the electromagnetic calorimeter of the Turkish Accelerator Center-Particle Factory (TAC-PF) detector. The energy resolution was obtained as $sigma_{E}/E = 0.42 % / sqrt{E/GeV} oplus 1.60 %$ at the center of the matrix in the energy range of 50 MeV to 2 GeV. When we examined the dependence of the energy resolution on the incidence angle of the photon, resolution began to deteriorate at angles greater than $2^{circ}$ on the 5 $times$ 5 crystal matrix. Moreover, energy resolution at the corners of the central crystal was worse than at the center of the central crystal by a factor of 1.3 at 50 MeV and 1.1 at 2 GeV.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74783555","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}
L. C. R. Aaij, C. Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, Federico Alessio, M. Alexander, A. A. Albero, Z. Aliouche, G. Alkhazov, P. Cartelle, S. Amato, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J. Back, S. Baker, P. Rodriguez, V. Balagura, W. Baldini, J. B. Leite, R. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, E. Bertholet, A. Bertolin, C. Betancourt, F. Betti, M. Bettler, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. Bieker, S. Bifani, P. Billoir, M. Birch, F. Bishop, A. Bizzeti, M. Bjørn, M. Blago, T. Blake, F. Blanc, S.
{"title":"Measurement of differential $$ boverline{b} $$- and $$ coverline{c} $$-dijet cross-sections in the forward region of pp collisions at $$ sqrt{s} $$ = 13 TeV","authors":"L. C. R. Aaij, C. Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, Federico Alessio, M. Alexander, A. A. Albero, Z. Aliouche, G. Alkhazov, P. Cartelle, S. Amato, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J. Back, S. Baker, P. Rodriguez, V. Balagura, W. Baldini, J. B. Leite, R. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, E. Bertholet, A. Bertolin, C. Betancourt, F. Betti, M. Bettler, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. Bieker, S. Bifani, P. Billoir, M. Birch, F. Bishop, A. Bizzeti, M. Bjørn, M. Blago, T. Blake, F. Blanc, S.","doi":"10.1007/JHEP02(2021)023","DOIUrl":"https://doi.org/10.1007/JHEP02(2021)023","url":null,"abstract":"","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85276029","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}
Pub Date : 2020-08-30DOI: 10.1016/j.nuclphysa.2020.121921
J. Kvapil
{"title":"Heavy-flavour jet production and correlations with ALICE","authors":"J. Kvapil","doi":"10.1016/j.nuclphysa.2020.121921","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2020.121921","url":null,"abstract":"","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76336276","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}
Pub Date : 2020-08-21DOI: 10.1103/PhysRevD.103.092008
S. Ajimura, W. M. Chan, K. Ichimura, T. Ishikawa, K. Kanagawa, B. T. Khai, T. Kishimoto, H. Kino, T. Maeda, K. Matsuoka, N. Nakatani, M. Nomachi, M. Saka, K. Seki, Y. Takemoto, Y. Takihira, D. Tanaka, M. Tanaka, K. Tetsuno, V. Trang, M. Tsuzuki, S. Umehara, K. Akutagawa, T. Batpurev, M. Doihara, S. Katagiri, E. Kinoshita, Y. Hirano, T. Iga, M. Ishikawa, G. Ito, H. Kakubata, K. Lee, X. Li, K. Mizukoshi, M. Moser, T. Ohata, M. Shokati, M. S. Soberi, T. Uehara, W. Wang, K. Yamamoto, K. Yasuda, S. Yoshida, N. Yotsunaga, T. Harada, H. Hiraoka, T. Hiyama, A. Hirota, Y. Ikeyama, A. Kawamura, Y. Kawashima, S. Maeda, K. Nakajima, I. Ogawa, K. Ozawa, K. Shamoto, K. Shimizu, Y. Shinki, Y. Tamagawa, M. Tozawa, M. Yoshizawa, K. Fushimi, R. Hazama, P. Noithong, A. Rittirong, K. Suzuki, T. Iida
We developed a CANDLES-III system using 96 CaF$_{2}$ scintillation crystals with a total mass of 305 kg to study the neutrino-less double beta (0$nubetabeta$) decay of $^{48}$Ca. The system was equipped with a 4$pi$ active shield using a liquid scintillator to reject external backgrounds. The internal backgrounds caused by the radioactive impurities within the CaF$_2$ crystals can be effectively reduced by observing the signal pulse shape. We analyzed the data observed in the Kamioka underground for the live-time of 130.4 days to evaluate the feasibility of the low background measurement with the CANDLES-III detector. Moreover, we estimated the number of background events from the simulation based on the radioactive impurities in the CaF$_{2}$ crystals and the rate of high energy $gamma$-rays caused by the (n, $gamma$) reaction induced by environmental neutrons. The expected background rate was in a good agreement with the measured rate. In conclusion, the background candidates were properly estimated by comparing the measured energy spectrum with the background simulations. Consequently, no events were observed in the Q$_{betabeta}$-value region when 21 high purity CaF$_{2}$ crystals were selected. This gave a lower limit on the half-life of T$^{0nubetabeta}_{1/2}$ $ge$ 5.6 $times$ 10$^{22}$ yr (90% confidence level) for the 0$nubetabeta$ decay of $^{48}$Ca. With this measurement, we achieved the first 0$nubetabeta$ decay search in a low background condition with a detector using a Ca isotope, which was not enriched but natural, in a scale of hundreds of kg. The $^{48}$Ca isotope has a high potential for the 0$nubetabeta$ decay search, and expected to be useful for the development of the next detector for a highly sensitive measurement.
{"title":"Low background measurement in CANDLES-III for studying the neutrinoless double beta decay of \u0000Ca48","authors":"S. Ajimura, W. M. Chan, K. Ichimura, T. Ishikawa, K. Kanagawa, B. T. Khai, T. Kishimoto, H. Kino, T. Maeda, K. Matsuoka, N. Nakatani, M. Nomachi, M. Saka, K. Seki, Y. Takemoto, Y. Takihira, D. Tanaka, M. Tanaka, K. Tetsuno, V. Trang, M. Tsuzuki, S. Umehara, K. Akutagawa, T. Batpurev, M. Doihara, S. Katagiri, E. Kinoshita, Y. Hirano, T. Iga, M. Ishikawa, G. Ito, H. Kakubata, K. Lee, X. Li, K. Mizukoshi, M. Moser, T. Ohata, M. Shokati, M. S. Soberi, T. Uehara, W. Wang, K. Yamamoto, K. Yasuda, S. Yoshida, N. Yotsunaga, T. Harada, H. Hiraoka, T. Hiyama, A. Hirota, Y. Ikeyama, A. Kawamura, Y. Kawashima, S. Maeda, K. Nakajima, I. Ogawa, K. Ozawa, K. Shamoto, K. Shimizu, Y. Shinki, Y. Tamagawa, M. Tozawa, M. Yoshizawa, K. Fushimi, R. Hazama, P. Noithong, A. Rittirong, K. Suzuki, T. Iida","doi":"10.1103/PhysRevD.103.092008","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.092008","url":null,"abstract":"We developed a CANDLES-III system using 96 CaF$_{2}$ scintillation crystals with a total mass of 305 kg to study the neutrino-less double beta (0$nubetabeta$) decay of $^{48}$Ca. The system was equipped with a 4$pi$ active shield using a liquid scintillator to reject external backgrounds. The internal backgrounds caused by the radioactive impurities within the CaF$_2$ crystals can be effectively reduced by observing the signal pulse shape. We analyzed the data observed in the Kamioka underground for the live-time of 130.4 days to evaluate the feasibility of the low background measurement with the CANDLES-III detector. Moreover, we estimated the number of background events from the simulation based on the radioactive impurities in the CaF$_{2}$ crystals and the rate of high energy $gamma$-rays caused by the (n, $gamma$) reaction induced by environmental neutrons. The expected background rate was in a good agreement with the measured rate. In conclusion, the background candidates were properly estimated by comparing the measured energy spectrum with the background simulations. Consequently, no events were observed in the Q$_{betabeta}$-value region when 21 high purity CaF$_{2}$ crystals were selected. This gave a lower limit on the half-life of T$^{0nubetabeta}_{1/2}$ $ge$ 5.6 $times$ 10$^{22}$ yr (90% confidence level) for the 0$nubetabeta$ decay of $^{48}$Ca. With this measurement, we achieved the first 0$nubetabeta$ decay search in a low background condition with a detector using a Ca isotope, which was not enriched but natural, in a scale of hundreds of kg. The $^{48}$Ca isotope has a high potential for the 0$nubetabeta$ decay search, and expected to be useful for the development of the next detector for a highly sensitive measurement.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83905436","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}
Pub Date : 2020-08-13DOI: 10.1103/physrevd.102.112005
B. C. M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, Q. An, Anita, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, J. Bennett, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Biernat, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Cetin, J. Chang, W. Chang, G. Chelkov, D. Chen, G. Chen, H. Chen, M. Chen, S. Chen, X. Chen, Y. Chen, Z. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, J. Dai, X. Dai, A. Dbeyssi, R. Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, S. Du, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, M. Fritsch, C. Fu, Y. Fu, X. Gao, Y. Gao, Y. Gao, I. Garzia, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. Guo, R. Guo, Y. Guo, A. Guskov, S. Han, T. Han, T. Han, X. Hao, F. Harris, K. He, F. He
Using $2.93~mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at a center-of-mass energy $sqrt{s}=3.773$ GeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic $D^{0(+)}$ decays into a $b_1(1235)^{-(0)}$ axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are ${mathcal B}_{D^0to b_1(1235)^- e^+nu_e}cdot {mathcal B}_{b_1(1235)^-to omegapi^-}<1.12times 10^{-4}$ and ${mathcal B}_{D^+to b_1(1235)^0 e^+nu_e}cdot {mathcal B}_{b_1(1235)^0to omegapi^0}<1.75times 10^{-4}$ at the 90% confidence level.
{"title":"Search for the semileptonic decay \u0000D0(+)→b1(1235)−(0)e+νe","authors":"B. C. M. Ablikim, M. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, R. Aliberti, A. Amoroso, Q. An, Anita, X. Bai, Y. Bai, O. Bakina, R. Ferroli, I. Balossino, Y. Ban, K. Begzsuren, J. Bennett, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, J. Biernat, J. Bloms, A. Bortone, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, N. Cao, S. Cetin, J. Chang, W. Chang, G. Chelkov, D. Chen, G. Chen, H. Chen, M. Chen, S. Chen, X. Chen, Y. Chen, Z. Chen, W. Cheng, G. Cibinetto, F. Cossio, X. Cui, H. Dai, J. Dai, X. Dai, A. Dbeyssi, R. Boer, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, S. Du, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Feng, M. Fritsch, C. Fu, Y. Fu, X. Gao, Y. Gao, Y. Gao, I. Garzia, E. Gersabeck, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, S. Gu, Y. Gu, C. Guan, A. Guo, L. Guo, R. Guo, Y. Guo, A. Guskov, S. Han, T. Han, T. Han, X. Hao, F. Harris, K. He, F. He","doi":"10.1103/physrevd.102.112005","DOIUrl":"https://doi.org/10.1103/physrevd.102.112005","url":null,"abstract":"Using $2.93~mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at a center-of-mass energy $sqrt{s}=3.773$ GeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic $D^{0(+)}$ decays into a $b_1(1235)^{-(0)}$ axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are ${mathcal B}_{D^0to b_1(1235)^- e^+nu_e}cdot {mathcal B}_{b_1(1235)^-to omegapi^-}<1.12times 10^{-4}$ and ${mathcal B}_{D^+to b_1(1235)^0 e^+nu_e}cdot {mathcal B}_{b_1(1235)^0to omegapi^0}<1.75times 10^{-4}$ at the 90% confidence level.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88834786","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}
Pub Date : 2020-08-10DOI: 10.1103/physrevd.102.072006
A. Hiramoto, Y. Suzuki, A. Ali, S. Aoki, L. Berns, T. Fukuda, Y. Hanaoka, Y. Hayato, A. Ichikawa, H. Kawahara, T. Kikawa, T. Koga, R. Komatani, M. Komatsu, Y. Kosakai, T. Matsuo, S. Mikado, A. Minamino, K. Mizuno, Y. Morimoto, K. Morishima, N. Naganawa, M. Naiki, M. Nakamura, Y. Nakamura, N. Nakano, T. Nakano, T. Nakaya, A. Nishio, T. Odagawa, S. Ogawa, H. Oshima, H. Rokujo, I. Sanjana, O. Sato, H. Shibuya, K. Sugimura, L. Suzui, H. Takagi, T. Takao, Y. Tanihara, K. Yasutome, M. Yokoyama
This paper reports the track multiplicity and kinematics of muons, charged pions, and protons from charged-current inclusive $overline{nu}_{mu}$ and $nu_{mu}$ interactions on a water target, measured using a nuclear emulsion detector in the NINJA experiment. A 3-kg water target was exposed to the T2K antineutrino-enhanced beam with a mean energy of 1.3 GeV. Owing to the high-granularity of the nuclear emulsion, protons with momenta down to 200 MeV/$c$ from the neutrino-water interactions were detected. We find good agreement between the observed data and model predictions for all kinematic distributions other than the number of charged pions. These results demonstrate the capability of measurements with nuclear emulsion to improve neutrino interaction models.
{"title":"First measurement of \u0000ν¯μ\u0000 and \u0000νμ\u0000 charged-current inclusive interactions on water using a nuclear emulsion detector","authors":"A. Hiramoto, Y. Suzuki, A. Ali, S. Aoki, L. Berns, T. Fukuda, Y. Hanaoka, Y. Hayato, A. Ichikawa, H. Kawahara, T. Kikawa, T. Koga, R. Komatani, M. Komatsu, Y. Kosakai, T. Matsuo, S. Mikado, A. Minamino, K. Mizuno, Y. Morimoto, K. Morishima, N. Naganawa, M. Naiki, M. Nakamura, Y. Nakamura, N. Nakano, T. Nakano, T. Nakaya, A. Nishio, T. Odagawa, S. Ogawa, H. Oshima, H. Rokujo, I. Sanjana, O. Sato, H. Shibuya, K. Sugimura, L. Suzui, H. Takagi, T. Takao, Y. Tanihara, K. Yasutome, M. Yokoyama","doi":"10.1103/physrevd.102.072006","DOIUrl":"https://doi.org/10.1103/physrevd.102.072006","url":null,"abstract":"This paper reports the track multiplicity and kinematics of muons, charged pions, and protons from charged-current inclusive $overline{nu}_{mu}$ and $nu_{mu}$ interactions on a water target, measured using a nuclear emulsion detector in the NINJA experiment. A 3-kg water target was exposed to the T2K antineutrino-enhanced beam with a mean energy of 1.3 GeV. Owing to the high-granularity of the nuclear emulsion, protons with momenta down to 200 MeV/$c$ from the neutrino-water interactions were detected. We find good agreement between the observed data and model predictions for all kinematic distributions other than the number of charged pions. These results demonstrate the capability of measurements with nuclear emulsion to improve neutrino interaction models.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76388170","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}
Pub Date : 2020-08-06DOI: 10.1142/s0218301320500743
E. Shokr, A. El-farrash, A. De Roeck, M. Mahmoud
Proton-Proton ($pp$) collisions at the Large Hadron Collider (LHC) are simulated in order to study events with a high local density of charged particles produced in narrow pseudorapidty windows of $Deltaeta$ = 0.1, 0.2, and 0.5. The $pp$ collisions are generated at center of mass energies of $sqrt{s} = 2.36$, $7$, $8$, and $13$ TeV, i.e. the energies at which the LHC has operated so far, using PYTHIA and HERWIG event generators. We have also studied the average of the maximum charged-particle density versus the event multiplicity for all events, using the different pseudorapidity windows. This study prepares for the multi-particle production background expected in a future search for anomalous high-density multiplicity fluctuations using the LHC data.
{"title":"Study of charged-particle multiplicity fluctuations in pp collisions with Monte Carlo event generators at the LHC","authors":"E. Shokr, A. El-farrash, A. De Roeck, M. Mahmoud","doi":"10.1142/s0218301320500743","DOIUrl":"https://doi.org/10.1142/s0218301320500743","url":null,"abstract":"Proton-Proton ($pp$) collisions at the Large Hadron Collider (LHC) are simulated in order to study events with a high local density of charged particles produced in narrow pseudorapidty windows of $Deltaeta$ = 0.1, 0.2, and 0.5. The $pp$ collisions are generated at center of mass energies of $sqrt{s} = 2.36$, $7$, $8$, and $13$ TeV, i.e. the energies at which the LHC has operated so far, using PYTHIA and HERWIG event generators. We have also studied the average of the maximum charged-particle density versus the event multiplicity for all events, using the different pseudorapidity windows. This study prepares for the multi-particle production background expected in a future search for anomalous high-density multiplicity fluctuations using the LHC data.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83130307","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}
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