Measurement of the Branching Fraction Br(Lambda_c+ -> p K- pi+)
A. Zupanc, C. Bartel, N. Gabyshev, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, K. Belous, B. Bhuyan, A. Bondar, G. Bonvic… 展开作者
A. Zupanc, C. Bartel, N. Gabyshev, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, K. Belous, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, M. -C. Chang, V. Chekelian, B. G. Cheon, K. Chilikin, R. Chistov, I. -S. Cho, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Doležal, Z. Drásal, D. Dutta, K. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, M. Feindt, T. Ferber, V. Gaur, S. Ganguly, A. Garmash, R. Gillard, R. Glattauer, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, X. H. He, Y. Hoshi, W. -S. Hou, M. Huschle, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Iwashita, I. Jaegle, T. Julius, J. H. Kang, E. Kato, Y. Kato, T. Kawasaki, H. Kichimi, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, B. Kronenbitter, T. Kuhr, T. Kumita, A. Kuzmin, Y. -J. Kwon, S. -H. Lee, J. Li, Y. Li, J. Libby, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, J. MacNaughton, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, R. Mussa, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, M. Nayak, E. Nedelkovska, M. Niiyama, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, S. L. Olsen, W. Ostrowicz, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, S. Ryu, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. -A. Shibata, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. -S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Steder, T. Sumiyoshi, U. Tamponi, K. Tanida, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, S. Uehara, Y. Unno, S. Uno, P. Urquijo, Y. Usov, C. Van Hulse, P. Vanhoefer, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, M. N. Wagner, C. H. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, H. Yamamoto, Y. Yamashita, S. Yashchenko, Y. Yook, Z. P. Zhang, V. Zhilich, V. Zhulanov
We present the first model-independent measurement of the absolute branching fraction of the Lambda_c+ -> p K- pi+ decay using a data sample of 978 fb^-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The number of Lambda_c+ baryons is determined by reconstructing the recoiling D(*)- anti-p pi+ system in events of the type e+e- -> D(*)- anti-p pi+ Lambda_c+. The branching fraction is measured to be Br(Lambda_c+ -> p K- pi+) = (6.84 +- 0.24^{+0.21}_{-0.27})%, where the first and second uncertainties are statistical and systematic, respectively.
First Measurement of the Ratio of Branching Fractions BR(LAMBDAB to Lambdac Mu Nu)/BR(LAMBDAB to Lambdac Pi) at CDF II
我们提出了第一次测量的分支分数BR（LAMBDAB到LAMBDAC MU NU）/BR（LAMBDAB到LAMBDAC PI）的基础上的171.5 pb-1的ppbar碰撞的质心能量为1.96 TeV的CDF-II检测器。此外，我们还提供了BR（B 0 TO DSTAR MU NU）/BR（B 0 TO DSTAR PI）和BR（B 0 TO D MU NU）/BR（B 0 TO D PI）的测量值，这些测量值用作对照样本，以了解用于Lambdab分析的数据和Monte Carlo。我们发现对照样品的相对分支分数分别与粒子数据组在0.7和1.1西格玛水平上获得的比率一致。最后，我们得到相对λ分支分数为：BR（LAMBDAB至LAMBDAC MU NU）/BR（LAMBDAB至LAMBDAC PI）=20.0 +- 3.0（stat）+- 1.2（syst）+ 0.7 - 2.1（BR）+- 0.5（UBR）。三个相对支化率的不确定度分别来自统计学、CDF内部系统学、外部测量分支比和未测量分支比。我们提出了一种方法来推导BR（LAMBDAB到LAMBDAC PI）使用以前的CDF测量，并获得BR（LAMBDAB到LAMBDAC PI）=（0.41 +- 0.19（stat + syst）+ 0.06 - 0.08（pt））%，其中最后的不确定性是由于测量的Lambdab pt光谱。结…
First Measurement of the Ratio of Branching Fractions B(Lambda_b to Lambda_c mu nu)/B(Lambda_b to Lambda_c pi)
分析使用的数据从积分亮度约172 pb-1的ppbar碰撞在sqrt（s）=1.96 TeV，收集与CDF II探测器在费米实验室Tevatron。Lambda_b和B 0相对支化分数测量为：B（Lambda_b至Lambda_c+ mu nu）/B（Lambda_b至Lambda_c+ pi）= 16.6 +- 3.0（stat）+- 1.0（syst）+2.6 -3.4（PDG）+- 0.3（EBR），B（B0至D+ mu nu）/B（B 0至D+ pi）= 9.9 +- 1.0（统计）+- 0.6（系统）+- 0.4（PDG）+- 0.5（EBR），B（B0至D*+ mu nu）/B（B 0 to D*+ pi）= 16.5 +- 2.3（stat）+- 0.6（syst）+- 0.5（PDG）+- 0.8（EBR）本文还测量了四个新的λ_b半轻子衰变的分支分数：Lambda_b到Lambda_c（2595）+ mu nu，Lambda_b到Lambda_c（2625）+ mu nu，Lambda_b到Sigma_c（2455）0 pi mu nu，Lambda_b到Sigma_c（2455）++ pi mu nu，相对于Lambda_b到Lambda_c mu nu衰变的分支分数。最后，测量了p-pbar碰撞中产生的Lambda_b重子的横动量分布，发现与B_0介子的横动量…
Observation of B0 to Lambda Lambdabar K0 and B0 to Lambda Lambdabar K*0 at Belle
We study the charmless decays B to Lambda Lambdabar h, where h stands for pi^+, K^+,K^0,K^{*+}, or K^{*0}, using a 605 fb^{-1} data sample collected at the Upsilon(4S)resonance with the Belle detector at the KEKB asymmetric energy e^+ e^- collider. We observe B0 to Lambda Lambdabar K0 and B0 to Lambda Lambdabar K*0 with branching fractions of (4.76^{+0.84}_{-0.68} (stat.) \pm 0.61 (syst.)) \times 10^{-6} and (2.46^{+0.87}_{-0.72} \pm 0.34) \times 10^{-6}, respectively. The significances of these signals in the threshold-mass enhanced mass region are 12.4 sigma and 9.3 sigma, respectively. We a…
Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV
