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A measurement of the energy loss spectrum of 150 GeV muons in iron (1996) |
- Berger, E,
- Blair, R,
- Dawson, J,
- Fuess, T A,
- Guarino, V,
- Hill, N,
- Magill, S,
- May, E,
- Nodulman, L,
- Price, L E,
- Proudfoot, J,
- Stanek, R,
- Underwood, D G,
- Wagner, R,
- Wicklund, B,
- Blanchot, G,
- Bosman, M,
- Casado, M P,
- Cavalli-Sforza, M,
- Efthymiopoulos, I,
- Ivanyushenkov, Yu M,
- Juste, A,
- Miralles, L,
- Orteu, S,
- Padilla, C,
- Perlas, J A,
- Riu, I,
- Ronceux, B,
- Teubert, F,
- Anderson, K J,
- Blucher, E,
- Evans, H,
- Merritt, F S,
- Pilcher, J E,
- Sanders, H,
- Shochet, M J,
- Tang, F,
- Turcot, A S,
- Wagner, D,
- Arsenescu, R,
- Constantinescu, S,
- Blaj, C,
- Boldea, V,
- Dita, S,
- Ajaltouni, Ziad J,
- Badaud, F,
- Bouhemaid, N,
- Brette, P,
- Brossard, M,
- Chadelas, R,
- Chevaleyre, J C,
- Crouau, M,
- Daudon, F,
- Dugne, J J,
- Michel, B,
- Montarou, G,
- Muanza, G S,
- Pallin, D,
- Plothow-Besch, Hartmute,
- Poirot, S,
- Reinmuth, G,
- Says, L P,
- Vazeille, F,
- Cobal, M,
- Gildemeister, O,
- Nessi, Marzio,
- Henriques, A,
- Poggioli, Luc,
- Sonderegger, P,
- Karapetian, G V,
- Astvatsaturov, A R,
- Borisov, O N,
- Budagov, Yu A,
- Chirikov-Zorin, I E,
- Chlachidze, G,
- Glagolev, V V,
- Kakurin, S,
- Kolomoets, V,
- Kovtun, V E,
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- Minashvili, I A,
- Pantea, D,
- Pukhov, O,
- Romanov, V,
- Rusakovitch, N A,
- Senchyshyn, V G,
- Semenov, V,
- Sissakian, A N,
- Shchelchkov, V,
- Shevtsov, A,
- Studenov, S,
- Tokár, S,
- Topilin, N D,
- Vinogradov, V,
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- Yarygin, G,
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- Kulchitskii, Yu A,
- Angelini, C,
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- Flaminio, Vincenzo,
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- Lokajícek, M,
- Némécek, S,
- Karyukhin, A N,
- Klioukhine, V I,
- Khokhlov, Yu A,
- Kopikov, S V,
- Kostrikov, M E,
- Kulagin, M,
- Lapin, V,
- Protopopov, Yu,
- Sidorov, V,
- Solodkov, A A,
- Starchenko, E A,
- Surkov, A,
- Zaitsev, A,
- Calôba, L P,
- Gaspar, M,
- Marroquin, F,
- Pereira, A,
- Seixas, J M,
- Berglund, S R,
- Böhm, C,
- Johansson, E K,
- Hellman, S,
- Holmgren, S O,
- Jon-And, K,
- Selldén, B,
- Tardell, S,
- Yamdagni, N,
- Ferrer, A,
- Honoré, P F,
- Albiol, F,
- De, K,
- Gallas, E J,
- Li, J,
- Sawyer, L,
- Stephens, R,
- Turcotte, M,
- White, A,
- Hakopian, H H,
- Grabskii, V,
- Mnatzakanian, E A,
- Vartapetian, A H
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Abstract |
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The energy loss spectrum of 150 GeV muons has been measured with a prototype of the ATLAS hadron calorimeter in the H8 beam of the CERN SPS.\\ The differential probability $dP/dv$ per radiation length of a fractional energy loss $v = \Delta E_{\mu} / E_{\mu}$ has been measured in the range $v = 0.01 \div 0.95 $; it is then compared with the theoretical predictions for energy losses due to bremsstrahlung and production of electron-positron pairs or of energetic knock-on electrons.\\ The integrated probability $\int_{0.01}^{0.95} (dP/dv) dv$ is $(1.610\pm0.015_{stat.}\pm0.105_{syst.})\cdot10^{-3}$ in agreement with the theoretical predictions of $1.556\cdot10^{-3}$ and $1.619\cdot10^{-3}$. %7.8.96 - start Agreement with theory is also found in two intervals of $v$ where production of electron-positron pairs and knock-on electrons dominates. In the region of bremsstrahlung dominance ($v = 0.12\div0.95$) the measured integrated probability $(1.160\pm0.040_{stat}\pm0.075_{syst})\cdot 10^{-4}$ is in agreement with the theoretical value of $1.185 \cdot 10^{-4} $, obtained using Petrukhin and Shestakov's \cite{PS} description of the bremsstrahlung process. The same result is about 3.6 standard deviations (defined as the quadratic sum of statistical and systematic errors) lower than the theoretical prediction of $ 1.472\cdot 10^{-4}$, obtained using Tsai's \cite{TS} description of bremsstrahlung. |
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